Updates version to 0.4.0 alpha 5

429 polyphase channelizer 25khz channel rate

.idea/dictionaries/denny.xml

@@ -14,6 +14,7 @@
       <w>nutall</w>
       <w>overflowable</w>
       <w>polyphase</w>
+      <w>qpsk</w>
       <w>remez</w>
       <w>resampler</w>
       <w>samplerate</w>

build.gradle

@@ -15,7 +15,7 @@ repositories {
     mavenCentral()
 }
 
-version = '0.4.0-alpha.1'
+version = '0.4.0-alpha.5'
 sourceCompatibility = 1.8
 
 sourceSets {

src/main/java/io/github/dsheirer/audio/AudioModule.java

@@ -27,7 +27,7 @@ import io.github.dsheirer.sample.Listener;
 import io.github.dsheirer.sample.buffer.IReusableBufferListener;
 import io.github.dsheirer.sample.buffer.ReusableAudioPacket;
 import io.github.dsheirer.sample.buffer.ReusableAudioPacketQueue;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -40,7 +40,7 @@ import org.slf4j.LoggerFactory;
  * This class is designed to support 8 kHz sample rate demodulated audio.
  */
 public class AudioModule extends Module implements IAudioPacketProvider, IReusableBufferListener,
-    ISquelchStateListener, Listener<ReusableBuffer>
+    ISquelchStateListener, Listener<ReusableFloatBuffer>
 {
     protected static final Logger mLog = LoggerFactory.getLogger(AudioModule.class);
     private ReusableAudioPacketQueue mAudioPacketQueue = new ReusableAudioPacketQueue("AudioModule");
@@ -139,11 +139,11 @@ public class AudioModule extends Module implements IAudioPacketProvider, IReusab
     }
 
     @Override
-    public void receive(ReusableBuffer reusableBuffer)
+    public void receive(ReusableFloatBuffer reusableFloatBuffer)
     {
         if(mAudioPacketListener != null && mSquelchState == SquelchState.UNSQUELCH)
         {
-            ReusableBuffer highPassFiltered = mHighPassFilter.filter(reusableBuffer);
+            ReusableFloatBuffer highPassFiltered = mHighPassFilter.filter(reusableFloatBuffer);
 
             ReusableAudioPacket audioPacket = mAudioPacketQueue.getBuffer(highPassFiltered.getSampleCount());
             audioPacket.loadAudioFrom(highPassFiltered);
@@ -155,7 +155,7 @@ public class AudioModule extends Module implements IAudioPacketProvider, IReusab
         }
         else
         {
-            reusableBuffer.decrementUserCount();
+            reusableFloatBuffer.decrementUserCount();
         }
     }
 

src/main/java/io/github/dsheirer/audio/broadcast/AudioBroadcaster.java

@@ -245,7 +245,11 @@ public abstract class AudioBroadcaster implements Listener<AudioRecording>
     {
         if(mBroadcastState != state)
         {
-            mLog.info("[" + getStreamName() + "] status: " + state);
+            if(state == BroadcastState.CONNECTED || state == BroadcastState.DISCONNECTED)
+            {
+                mLog.info("[" + getStreamName() + "] status: " + state);
+            }
+
             mBroadcastState = state;
 
             broadcast(new BroadcastEvent(this, BroadcastEvent.Event.BROADCASTER_STATE_CHANGE));

src/main/java/io/github/dsheirer/audio/broadcast/BroadcastState.java

@@ -70,6 +70,11 @@ public enum BroadcastState
      */
     MOUNT_POINT_IN_USE("Mount Point In Use", false),
 
+    /**
+     * Network is unavailable or the server address cannot be resolved
+     */
+    NETWORK_UNAVAILABLE("Network Unavailable", false),
+
     /**
      * Server is not known or reachable
      */

src/main/java/io/github/dsheirer/audio/broadcast/BroadcastStatusPanel.java

@@ -20,9 +20,14 @@ package io.github.dsheirer.audio.broadcast;
 
 import net.miginfocom.swing.MigLayout;
 
-import javax.swing.*;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JScrollPane;
+import javax.swing.JTable;
+import javax.swing.SwingConstants;
 import javax.swing.table.DefaultTableCellRenderer;
-import java.awt.*;
+import java.awt.Color;
+import java.awt.Component;
 
 public class BroadcastStatusPanel extends JPanel
 {
@@ -96,7 +101,8 @@ public class BroadcastStatusPanel extends JPanel
                         setBackground(table.getBackground());
                         setForeground(Color.LIGHT_GRAY);
                     }
-                    else if(state == BroadcastState.INVALID_SETTINGS)
+                    else if(state == BroadcastState.INVALID_SETTINGS ||
+                            state == BroadcastState.NETWORK_UNAVAILABLE)
                     {
                         setBackground(Color.YELLOW);
                         setForeground(table.getForeground());

src/main/java/io/github/dsheirer/audio/broadcast/icecast/IcecastBroadcastMetadataUpdater.java

@@ -22,6 +22,7 @@ import io.github.dsheirer.audio.broadcast.IBroadcastMetadataUpdater;
 import io.github.dsheirer.channel.metadata.Metadata;
 import io.github.dsheirer.properties.SystemProperties;
 import io.github.dsheirer.util.ThreadPool;
+import org.apache.mina.core.RuntimeIoException;
 import org.apache.mina.core.future.ConnectFuture;
 import org.apache.mina.core.service.IoHandlerAdapter;
 import org.apache.mina.core.session.IoSession;
@@ -35,7 +36,6 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.UnsupportedEncodingException;
-import java.net.ConnectException;
 import java.net.InetSocketAddress;
 import java.net.URLEncoder;
 import java.nio.channels.UnresolvedAddressException;
@@ -117,70 +117,64 @@ public class IcecastBroadcastMetadataUpdater implements IBroadcastMetadataUpdate
     {
         mMetadataQueue.offer(getSong(metadata));
 
-        if(mUpdating.compareAndSet(false, true))
+        if(!mUpdating.get() && !mMetadataQueue.isEmpty())
         {
-            String song = mMetadataQueue.poll();
-
-            while(song != null)
+            Runnable runnable =  new Runnable()
             {
-                HttpRequest updateRequest = createUpdateRequest(song);
-
-                if(updateRequest != null)
+                @Override
+                public void run()
                 {
-                    ThreadPool.SCHEDULED.schedule(new Runnable()
+                    if(!mMetadataQueue.isEmpty() && mUpdating.compareAndSet(false, true))
                     {
-                        @Override
-                        public void run()
+                        try
                         {
-                            try
-                            {
-                                ConnectFuture connectFuture = getSocketConnector()
-                                    .connect(new InetSocketAddress(mIcecastConfiguration.getHost(),
-                                        mIcecastConfiguration.getPort()));
-                                connectFuture.awaitUninterruptibly();
-                                IoSession session = connectFuture.getSession();
+                            ConnectFuture connectFuture = getSocketConnector()
+                                .connect(new InetSocketAddress(mIcecastConfiguration.getHost(),
+                                    mIcecastConfiguration.getPort()));
+                            connectFuture.awaitUninterruptibly();
+                            IoSession session = connectFuture.getSession();
 
-                                if(session != null)
-                                {
-                                    session.write(updateRequest);
-                                }
-                            }
-                            catch(UnresolvedAddressException uae)
+                            if(session != null)
                             {
-                                //Do nothing - the server is temporarily unavailable
-                            }
-                            catch(Exception e)
-                            {
-                                Throwable throwableCause = e.getCause();
+                                String song = mMetadataQueue.poll();
 
-                                if(throwableCause instanceof ConnectException)
+                                while(song != null)
                                 {
-                                    //Do nothing, the server is unavailable
-                                }
-                                else if(throwableCause instanceof UnresolvedAddressException)
-                                {
-                                    //Do nothing - the server is temporarily unavailable
-                                }
-                                else
-                                {
-                                    if(!mStackTraceLoggingSuppressed)
+                                    HttpRequest updateRequest = createUpdateRequest(song);
+
+                                    if(updateRequest != null)
                                     {
-                                        mLog.error("Error sending metadata update.  Future errors will " +
-                                            "be suppressed", e);
-
-                                        mStackTraceLoggingSuppressed = true;
+                                        session.write(updateRequest);
                                     }
+
+                                    //Fetch next metadata update to send
+                                    song = mMetadataQueue.poll();
                                 }
+
+                                session.closeNow();
                             }
                         }
-                    }, 0l, TimeUnit.SECONDS);
+                        catch(UnresolvedAddressException | RuntimeIoException ure)
+                        {
+                            //Do nothing - the server is temporarily unavailable
+                        }
+                        catch(Exception e)
+                        {
+                            Throwable throwableCause = e.getCause();
+
+                            if(!mStackTraceLoggingSuppressed)
+                            {
+                                mLog.error("Error sending metadata update.  Future errors will be suppressed", e);
+                                mStackTraceLoggingSuppressed = true;
+                            }
+                        }
+
+                        mUpdating.set(false);
+                    }
                 }
+            };
 
-                //Fetch next metadata update to send
-                song = mMetadataQueue.poll();
-            }
-
-            mUpdating.set(false);
+            ThreadPool.SCHEDULED.schedule(runnable, 0l, TimeUnit.SECONDS);
         }
     }
 

src/main/java/io/github/dsheirer/audio/broadcast/icecast/IcecastTCPAudioBroadcaster.java

@@ -27,15 +27,14 @@ import org.apache.mina.core.RuntimeIoException;
 import org.apache.mina.core.future.ConnectFuture;
 import org.apache.mina.core.service.IoHandlerAdapter;
 import org.apache.mina.core.session.IoSession;
-import org.apache.mina.core.write.WriteTimeoutException;
 import org.apache.mina.filter.codec.ProtocolCodecFilter;
 import org.apache.mina.transport.socket.nio.NioSocketConnector;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
-import java.net.ConnectException;
 import java.net.InetSocketAddress;
+import java.net.SocketException;
 import java.nio.channels.UnresolvedAddressException;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
@@ -46,7 +45,8 @@ public class IcecastTCPAudioBroadcaster extends IcecastAudioBroadcaster
     private final static String TERMINATOR = "\r\n";
     private final static String SEPARATOR = ":";
     private static final long RECONNECT_INTERVAL_MILLISECONDS = 3000; //3 seconds
-    private static final long CONNECTION_ATTEMPT_TIMEOUT = 5000; //5 seconds
+    private static final long CONNECTION_ATTEMPT_TIMEOUT_MILLISECONDS = 5000; //5 seconds
+    private static final int WRITE_TIMEOUT_SECONDS = 5;
 
     private NioSocketConnector mSocketConnector;
     private IoSession mStreamingSession = null;
@@ -101,7 +101,7 @@ public class IcecastTCPAudioBroadcaster extends IcecastAudioBroadcaster
             if(mSocketConnector == null)
             {
                 mSocketConnector = new NioSocketConnector();
-                mSocketConnector.setConnectTimeoutCheckInterval(CONNECTION_ATTEMPT_TIMEOUT);
+                mSocketConnector.getSessionConfig().setWriteTimeout(WRITE_TIMEOUT_SECONDS);
 
 //                LoggingFilter loggingFilter = new LoggingFilter(IcecastTCPAudioBroadcaster.class);
 //                loggingFilter.setMessageSentLogLevel(LogLevel.NONE);
@@ -127,45 +127,41 @@ public class IcecastTCPAudioBroadcaster extends IcecastAudioBroadcaster
                             .connect(new InetSocketAddress(getBroadcastConfiguration().getHost(),
                                 getBroadcastConfiguration().getPort()));
 
-                        boolean connected = future.await(CONNECTION_ATTEMPT_TIMEOUT, TimeUnit.MILLISECONDS);
+                        boolean connected = future.await(CONNECTION_ATTEMPT_TIMEOUT_MILLISECONDS, TimeUnit.MILLISECONDS);
 
-                        mStreamingSession = future.getSession();
+                        if(connected)
+                        {
+                            mStreamingSession = future.getSession();
+                            mConnecting.set(false);
+                            return;
+                        }
+                    }
+                    catch(RuntimeIoException rioe)
+                    {
+                        if(rioe.getCause() instanceof SocketException)
+                        {
+                            setBroadcastState(BroadcastState.NETWORK_UNAVAILABLE);
+                            mConnecting.set(false);
+                            return;
+                        }
                     }
                     catch(UnresolvedAddressException uae)
                     {
-                        //What do you do with this?  Nothing.
+                        setBroadcastState(BroadcastState.NETWORK_UNAVAILABLE);
+                        mConnecting.set(false);
+                        return;
                     }
-                    catch(InterruptedException ie)
+                    catch(Exception e)
                     {
-                        //We couldn't connect within the timeout period -- disconnect so that we can try again later
-                        disconnect();
-                    }
-                    catch(RuntimeIoException rie)
-                    {
-                        Throwable throwableCause = rie.getCause();
-
-                        if(throwableCause instanceof ConnectException)
-                        {
-                            setBroadcastState(BroadcastState.NO_SERVER);
-                        }
-                        else if(throwableCause != null)
-                        {
-                            setBroadcastState(BroadcastState.ERROR);
-                            mLog.debug("[" + getStreamName() + "] failed to connect", rie);
-                        }
-                        else
-                        {
-                            setBroadcastState(BroadcastState.ERROR);
-                            mLog.debug("[" + getStreamName() + "] failed to connect - no exception is available");
-                        }
-
-                        disconnect();
+                        mLog.error("Error", e);
+                        //Disregard ... we'll disconnect and try again
                     }
                     catch(Throwable t)
                     {
-                        disconnect();
+                        mLog.error("Throwable error caught", t);
                     }
 
+                    disconnect();
                     mConnecting.set(false);
                 }
             };
@@ -188,6 +184,7 @@ public class IcecastTCPAudioBroadcaster extends IcecastAudioBroadcaster
         }
         else
         {
+            setBroadcastState(BroadcastState.DISCONNECTED);
             mLastConnectionAttempt = System.currentTimeMillis();
         }
     }
@@ -263,49 +260,12 @@ public class IcecastTCPAudioBroadcaster extends IcecastAudioBroadcaster
         @Override
         public void exceptionCaught(IoSession session, Throwable cause) throws Exception
         {
-            if(cause instanceof IOException)
-            {
-                IOException ioe = (IOException)cause;
-
-                if(ioe.getMessage() != null)
-                {
-                    String reason = ioe.getMessage();
-
-                    if(connected())
-                    {
-                        disconnect();
-                    }
-                    else if(reason.startsWith("Connection reset"))
-                    {
-                        disconnect();
-                    }
-                    else if(reason.startsWith("Operation timed out"))
-                    {
-                        disconnect();
-                    }
-                    else
-                    {
-                        setBroadcastState(BroadcastState.ERROR);
-                        disconnect();
-                    }
-                }
-                else if(ioe instanceof WriteTimeoutException)
-                {
-                    disconnect();
-                }
-                else
-                {
-                    setBroadcastState(BroadcastState.ERROR);
-                    disconnect();
-                    mLog.error("[" + getStreamName() + "] Unspecified IO error - streaming halted.", cause);
-                }
-            }
-            else
+            if(!(cause instanceof IOException))
             {
                 mLog.error("[" + getStreamName() + "] Broadcast error", cause);
-                setBroadcastState(BroadcastState.ERROR);
-                disconnect();
             }
+
+            disconnect();
         }
 
         @Override

src/main/java/io/github/dsheirer/bits/ISyncProcessor.java

@@ -1,6 +1,26 @@
+/*******************************************************************************
+ * sdr-trunk
+ * Copyright (C) 2014-2018 Dennis Sheirer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by  the Free Software Foundation, either version 3 of the License, or  (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful,  but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License  along with this program.
+ * If not, see <http://www.gnu.org/licenses/>
+ *
+ ******************************************************************************/
 package io.github.dsheirer.bits;
 
 public interface ISyncProcessor
 {
-	public void checkSync( long value );
+    /**
+     * Checks if the value matches a known sync pattern
+     * @param value
+     * @return
+     */
+    boolean checkSync(long value);
 }

src/main/java/io/github/dsheirer/bits/MultiSyncPatternMatcher.java

@@ -1,111 +1,130 @@
 /*******************************************************************************
- *     SDR Trunk 
- *     Copyright (C) 2014 Dennis Sheirer
- * 
- *     This program is free software: you can redistribute it and/or modify
- *     it under the terms of the GNU General Public License as published by
- *     the Free Software Foundation, either version 3 of the License, or
- *     (at your option) any later version.
- * 
- *     This program is distributed in the hope that it will be useful,
- *     but WITHOUT ANY WARRANTY; without even the implied warranty of
- *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *     GNU General Public License for more details.
- * 
- *     You should have received a copy of the GNU General Public License
- *     along with this program.  If not, see <http://www.gnu.org/licenses/>
+ * sdr-trunk
+ * Copyright (C) 2014-2018 Dennis Sheirer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by  the Free Software Foundation, either version 3 of the License, or  (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful,  but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License  along with this program.
+ * If not, see <http://www.gnu.org/licenses/>
+ *
  ******************************************************************************/
 package io.github.dsheirer.bits;
 
+import io.github.dsheirer.dsp.symbol.ISyncDetectListener;
 import org.apache.commons.lang3.Validate;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.util.ArrayList;
 import java.util.List;
 
 /**
- * Multi-Sync pattern matcher.  Accepts multiple sync detector objects for 
+ * Multi-Sync pattern matcher.  Accepts multiple sync detector objects for
  * comparision against the incoming bit stream.
- * 
+ *
  * Note: works for sync patterns up to 63 bits (integer size - 1 ) long.
  * If a 64 bit or larger sync pattern is applied, then the wrapping feature
  * of the Long.rotate methods will wrap the MSB around to the LSB and
  * corrupt the matching value.
- *
  */
 public class MultiSyncPatternMatcher
 {
-	private List<ISyncProcessor> mSyncProcessors = new ArrayList<ISyncProcessor>();
-	
-	private long mBits = 0;
-	private long mMask = 0;
-	
-	public MultiSyncPatternMatcher( int syncSize )
-	{
-		Validate.isTrue(syncSize < 64);
-		
-		//Setup a bit mask of all ones the length of the sync pattern
-		mMask = (long)( ( Math.pow( 2, syncSize ) ) - 1 );
-	}
-	
-	public void dispose()
-	{
-		mSyncProcessors.clear();
-	}
-	
-	/**
-	 * Processes two bits before checking sync processors for a match.
-	 */
-	public void receive( boolean bit1, boolean bit2 )
-	{
-		mBits = Long.rotateLeft( mBits, 1 );
-		
-		mBits &= mMask;
-		
-		if( bit1 )
-		{
-			mBits += 1;
-		}
+    private final static Logger mLog = LoggerFactory.getLogger(MultiSyncPatternMatcher.class);
 
-		mBits = Long.rotateLeft( mBits, 1 );
-		
-		mBits &= mMask;
-		
-		if( bit2 )
-		{
-			mBits += 1;
-		}
+    private ISyncDetectListener mSyncDetectListener;
+    private int mSyncLossThreshold;
+    private int mBitCount;
+    private List<ISyncProcessor> mSyncProcessors = new ArrayList<ISyncProcessor>();
 
-		for( ISyncProcessor processor: mSyncProcessors )
-		{
-			processor.checkSync( mBits );
-		}
-	}
-	
-	/**
-	 * Processes one bit before checking sync processors for a match.
-	 */
-	public void receive( boolean bit )
-	{
-		mBits = Long.rotateLeft( mBits, 1 );
-		
-		mBits &= mMask;
-		
-		if( bit )
-		{
-			mBits += 1;
-		}
+    private long mBits = 0;
+    private long mMask = 0;
 
-		for( ISyncProcessor processor: mSyncProcessors )
-		{
-			processor.checkSync( mBits );
-		}
-	}
+    public MultiSyncPatternMatcher(ISyncDetectListener syncDetectListener, int syncLossThreshold, int syncSize)
+    {
+        mSyncDetectListener = syncDetectListener;
+        mSyncLossThreshold = syncLossThreshold;
+        Validate.isTrue(syncSize < 64);
 
-	/**
-	 * Adds a sync processor to receive the bit stream.
-	 */
-	public void add( ISyncProcessor processor )
-	{
-		mSyncProcessors.add( processor );
-	}
+        //Setup a bit mask of all ones the length of the sync pattern
+        mMask = (long)((Math.pow(2, syncSize)) - 1);
+    }
+
+    public void dispose()
+    {
+        mSyncProcessors.clear();
+    }
+
+    /**
+     * Processes two bits before checking sync processors for a match.
+     */
+    public void receive(boolean bit1, boolean bit2)
+    {
+        mBits = Long.rotateLeft(mBits, 1);
+
+        mBits &= mMask;
+
+        if(bit1)
+        {
+            mBits += 1;
+        }
+
+        mBits = Long.rotateLeft(mBits, 1);
+
+        mBits &= mMask;
+
+        if(bit2)
+        {
+            mBits += 1;
+        }
+
+        mBitCount += 2;
+
+        for(ISyncProcessor processor : mSyncProcessors)
+        {
+            if(processor.checkSync(mBits))
+            {
+                mSyncDetectListener.syncDetected();
+                mBitCount = 0;
+            }
+        }
+
+        if(mBitCount > mSyncLossThreshold)
+        {
+            mBitCount = 0;
+            mSyncDetectListener.syncLost();
+        }
+    }
+
+    /**
+     * Processes one bit before checking sync processors for a match.
+     */
+    public void receive(boolean bit)
+    {
+        mBits = Long.rotateLeft(mBits, 1);
+
+        mBits &= mMask;
+
+        if(bit)
+        {
+            mBits += 1;
+        }
+
+        for(ISyncProcessor processor : mSyncProcessors)
+        {
+            processor.checkSync(mBits);
+        }
+    }
+
+    /**
+     * Adds a sync processor to receive the bit stream.
+     */
+    public void add(ISyncProcessor processor)
+    {
+        mSyncProcessors.add(processor);
+    }
 }

src/main/java/io/github/dsheirer/bits/SoftSyncDetector.java

@@ -1,50 +1,68 @@
+/*******************************************************************************
+ * sdr-trunk
+ * Copyright (C) 2014-2018 Dennis Sheirer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by  the Free Software Foundation, either version 3 of the License, or  (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful,  but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License  along with this program.
+ * If not, see <http://www.gnu.org/licenses/>
+ *
+ ******************************************************************************/
 package io.github.dsheirer.bits;
 
 import io.github.dsheirer.dsp.symbol.ISyncDetectListener;
 
 public class SoftSyncDetector implements ISyncProcessor
 {
-	private ISyncDetectListener mListener;
-	private long mPattern;
-	private int mThreshold;
-	
-	public SoftSyncDetector( ISyncDetectListener listener, long pattern, int threshold )
-	{
-		this( pattern, threshold );
-		
-		mListener = listener;
-	}
-	
-	public SoftSyncDetector( long pattern, int threshold )
-	{
-		mPattern = pattern;
-		mThreshold = threshold;
-	}
-	
-	public void dispose()
-	{
-		mListener = null;
-	}
+    private ISyncDetectListener mListener;
+    private long mPattern;
+    private int mThreshold;
 
-	@Override
-	public void checkSync( long value )
-	{
-		long difference = value ^ mPattern;
-		
-		if( ( difference == 0 || Long.bitCount( difference ) <= mThreshold ) &&
-			  mListener != null )
-		{
-			mListener.syncDetected();
-		}
-	}
-	
-	public void setThreshold( int threshold )
-	{
-		mThreshold = threshold;
-	}
-	
-	public void setListener( ISyncDetectListener listener )
-	{
-		mListener = listener;
-	}
+    public SoftSyncDetector(ISyncDetectListener listener, long pattern, int threshold)
+    {
+        this(pattern, threshold);
+
+        mListener = listener;
+    }
+
+    public SoftSyncDetector(long pattern, int threshold)
+    {
+        mPattern = pattern;
+        mThreshold = threshold;
+    }
+
+    public void dispose()
+    {
+        mListener = null;
+    }
+
+    @Override
+    public boolean checkSync(long value)
+    {
+        long difference = value ^ mPattern;
+
+        if((difference == 0 || Long.bitCount(difference) <= mThreshold) &&
+            mListener != null)
+        {
+            mListener.syncDetected();
+            return true;
+        }
+
+        return false;
+    }
+
+    public void setThreshold(int threshold)
+    {
+        mThreshold = threshold;
+    }
+
+    public void setListener(ISyncDetectListener listener)
+    {
+        mListener = listener;
+    }
 }

src/main/java/io/github/dsheirer/bits/SyncDetector.java

@@ -1,35 +1,57 @@
+/*******************************************************************************
+ * sdr-trunk
+ * Copyright (C) 2014-2018 Dennis Sheirer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by  the Free Software Foundation, either version 3 of the License, or  (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful,  but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License  along with this program.
+ * If not, see <http://www.gnu.org/licenses/>
+ *
+ ******************************************************************************/
 package io.github.dsheirer.bits;
 
 import io.github.dsheirer.dsp.symbol.ISyncDetectListener;
 
 public class SyncDetector implements ISyncProcessor
 {
-	private long mPattern;
-	private ISyncDetectListener mListener;
+    private long mPattern;
+    private ISyncDetectListener mListener;
 
-	public SyncDetector( long pattern )
-	{
-		mPattern = pattern;
-	}
-	
-	public SyncDetector( long pattern, ISyncDetectListener listener )
-	{
-		this( pattern );
-		
-		mListener = listener;
-	}
-	
-	public void setListener( ISyncDetectListener listener )
-	{
-		mListener = listener;
-	}
+    public SyncDetector(long pattern)
+    {
+        mPattern = pattern;
+    }
 
-	@Override
-	public void checkSync( long value )
-	{
-		if( value == mPattern && mListener != null )
-		{
-			mListener.syncDetected();
-		}
-	}
+    public SyncDetector(long pattern, ISyncDetectListener listener)
+    {
+        this(pattern);
+
+        mListener = listener;
+    }
+
+    public void setListener(ISyncDetectListener listener)
+    {
+        mListener = listener;
+    }
+
+    @Override
+    public boolean checkSync(long value)
+    {
+        if(value == mPattern)
+        {
+            if(mListener != null)
+            {
+                mListener.syncDetected();
+            }
+
+            return true;
+        }
+
+        return false;
+    }
 }

src/main/java/io/github/dsheirer/channel/metadata/Attribute.java

@@ -20,6 +20,7 @@ package io.github.dsheirer.channel.metadata;
 
 public enum Attribute
 {
+    BUFFER_OVERFLOW,
     CHANNEL_CONFIGURATION_NAME,
     CHANNEL_CONFIGURATION_SITE,
     CHANNEL_CONFIGURATION_SYSTEM,

src/main/java/io/github/dsheirer/channel/metadata/AttributeChangeRequest.java

@@ -116,6 +116,16 @@ public class AttributeChangeRequest<T>
         return null;
     }
 
+    public Boolean getBooleanValue()
+    {
+        if(mValue instanceof Boolean)
+        {
+            return (Boolean)mValue;
+        }
+
+        return false;
+    }
+
     /**
      * Returns the value as a DecoderType or null if the value is not a DecoderType instance.
      */

src/main/java/io/github/dsheirer/channel/metadata/AttributeMonitor.java

@@ -123,6 +123,11 @@ public class AttributeMonitor<T>
     {
         mCurrentValue = null;
         mOccurrenceCounts.clear();
+
+        if(mListener != null)
+        {
+            mListener.receive(new AttributeChangeRequest(mAttribute, null, null));
+        }
     }
 
     /**

src/main/java/io/github/dsheirer/channel/metadata/ChannelMetadataModel.java

@@ -1,19 +1,16 @@
 /*******************************************************************************
- * sdrtrunk
- * Copyright (C) 2014-2017 Dennis Sheirer
+ * sdr-trunk
+ * Copyright (C) 2014-2018 Dennis Sheirer
  *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by  the Free Software Foundation, either version 3 of the License, or  (at your option) any
+ * later version.
  *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * This program is distributed in the hope that it will be useful,  but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ * You should have received a copy of the GNU General Public License  along with this program.
+ * If not, see <http://www.gnu.org/licenses/>
  *
  ******************************************************************************/
 package io.github.dsheirer.channel.metadata;
@@ -21,9 +18,11 @@ package io.github.dsheirer.channel.metadata;
 import io.github.dsheirer.channel.state.State;
 import io.github.dsheirer.controller.channel.Channel;
 import io.github.dsheirer.sample.Listener;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import javax.swing.table.AbstractTableModel;
-import java.awt.*;
+import java.awt.EventQueue;
 import java.text.DecimalFormat;
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -32,6 +31,8 @@ import java.util.Map;
 
 public class ChannelMetadataModel extends AbstractTableModel implements Listener<MutableMetadataChangeEvent>
 {
+    private final static Logger mLog = LoggerFactory.getLogger(ChannelMetadataModel.class);
+
     private final DecimalFormat FREQUENCY_FORMATTER = new DecimalFormat( "#.00000" );
 
     public static final int COLUMN_STATE = 0;
@@ -45,7 +46,7 @@ public class ChannelMetadataModel extends AbstractTableModel implements Listener
     public static final int COLUMN_CONFIGURATION_NAME = 8;
     public static final int COLUMN_MESSAGE = 9;
 
-    private static final String[] COLUMNS = {"State", "Decoder", "Channel", "Frequency", "Primary From", "Primary To",
+    private static final String[] COLUMNS = {"Status", "Decoder", "Channel", "Frequency", "Primary From", "Primary To",
          "Secondary From", "Secondary To", "Channel Name", "Message"};
 
     private List<MutableMetadata> mChannelMetadata = new ArrayList();
@@ -184,7 +185,11 @@ public class ChannelMetadataModel extends AbstractTableModel implements Listener
 
                     return null;
                 case COLUMN_MESSAGE:
-                    if(metadata.hasMessageType() | metadata.hasMessage())
+                    if(metadata.isBufferOverflow())
+                    {
+                        return "**OVERFLOW**";
+                    }
+                    else if(metadata.hasMessageType() || metadata.hasMessage())
                     {
                         StringBuilder sb = new StringBuilder();
                         if(metadata.hasMessageType())
@@ -248,6 +253,7 @@ public class ChannelMetadataModel extends AbstractTableModel implements Listener
                         case CHANNEL_STATE:
                             fireTableCellUpdated(rowIndex, COLUMN_STATE);
                             break;
+                        case BUFFER_OVERFLOW:
                         case MESSAGE:
                         case MESSAGE_TYPE:
                             fireTableCellUpdated(rowIndex, COLUMN_MESSAGE);

src/main/java/io/github/dsheirer/channel/metadata/ChannelMetadataPanel.java

@@ -25,32 +25,36 @@ import io.github.dsheirer.controller.channel.ChannelProcessingManager;
 import io.github.dsheirer.controller.channel.ChannelUtils;
 import io.github.dsheirer.icon.IconManager;
 import io.github.dsheirer.module.ProcessingChain;
-import io.github.dsheirer.properties.SystemProperties;
 import io.github.dsheirer.sample.Broadcaster;
 import io.github.dsheirer.sample.Listener;
 import net.miginfocom.swing.MigLayout;
 import org.apache.commons.lang3.Validate;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
-import javax.swing.*;
+import javax.swing.JLabel;
+import javax.swing.JMenuItem;
+import javax.swing.JPanel;
+import javax.swing.JPopupMenu;
+import javax.swing.JScrollPane;
+import javax.swing.JTable;
+import javax.swing.SwingConstants;
 import javax.swing.event.ListSelectionEvent;
 import javax.swing.event.ListSelectionListener;
 import javax.swing.table.DefaultTableCellRenderer;
-import java.awt.*;
+import java.awt.Color;
+import java.awt.Component;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
+import java.util.HashMap;
+import java.util.Map;
 
 public class ChannelMetadataPanel extends JPanel implements ListSelectionListener
 {
-    private final static Logger mLog = LoggerFactory.getLogger(ChannelMetadataPanel.class);
-
-    private static final String PROPERTY_PREFIX_BACKGROUND = "channel.metadata.panel.state.color.";
-    private static final String PROPERTY_PREFIX_FOREGROUND = "channel.metadata.panel.text.color.";
     private ChannelProcessingManager mChannelProcessingManager;
     private IconManager mIconManager;
     private JTable mTable;
     private Broadcaster<ProcessingChain> mSelectedProcessingChainBroadcaster = new Broadcaster<>();
+    private Map<State,Color> mBackgroundColors = new HashMap<>();
+    private Map<State,Color> mForegroundColors = new HashMap<>();
 
     /**
      * Table view for currently decoding channel metadata
@@ -94,7 +98,32 @@ public class ChannelMetadataPanel extends JPanel implements ListSelectionListene
 
         add(scrollPane);
 
-//        new TableColumnWidthMonitor(mTable, PROPERTY_PREFIX, new int[] {15,15,15,15,25,25,25,25,15,40});
+        setColors();
+    }
+
+    /**
+     * Setup the background and foreground color palette for the various channel states.
+     */
+    private void setColors()
+    {
+        mBackgroundColors.put(State.ACTIVE, Color.CYAN);
+        mForegroundColors.put(State.ACTIVE, Color.YELLOW);
+        mBackgroundColors.put(State.CALL, Color.BLUE);
+        mForegroundColors.put(State.CALL, Color.YELLOW);
+        mBackgroundColors.put(State.CONTROL, Color.ORANGE);
+        mForegroundColors.put(State.CONTROL, Color.BLUE);
+        mBackgroundColors.put(State.DATA, Color.GREEN);
+        mForegroundColors.put(State.DATA, Color.BLUE);
+        mBackgroundColors.put(State.ENCRYPTED, Color.MAGENTA);
+        mForegroundColors.put(State.ENCRYPTED, Color.WHITE);
+        mBackgroundColors.put(State.FADE, Color.LIGHT_GRAY);
+        mForegroundColors.put(State.FADE, Color.DARK_GRAY);
+        mBackgroundColors.put(State.IDLE, Color.WHITE);
+        mForegroundColors.put(State.IDLE, Color.DARK_GRAY);
+        mBackgroundColors.put(State.RESET, Color.PINK);
+        mForegroundColors.put(State.RESET, Color.YELLOW);
+        mBackgroundColors.put(State.TEARDOWN, Color.DARK_GRAY);
+        mForegroundColors.put(State.TEARDOWN, Color.WHITE);
     }
 
     @Override
@@ -185,44 +214,14 @@ public class ChannelMetadataPanel extends JPanel implements ListSelectionListene
                 State state = (State)value;
                 label.setText(state.getDisplayValue());
 
-                switch(state)
+                if(mBackgroundColors.containsKey(state))
                 {
-                    case CALL:
-                        background = SystemProperties.getInstance().get(PROPERTY_PREFIX_BACKGROUND + "call", Color.BLUE);
-                        foreground = SystemProperties.getInstance().get(PROPERTY_PREFIX_FOREGROUND + "call", Color.YELLOW);
-                        break;
-                    case CONTROL:
-                        background = SystemProperties.getInstance().get(PROPERTY_PREFIX_BACKGROUND + "control", Color.ORANGE);
-                        foreground = SystemProperties.getInstance().get(PROPERTY_PREFIX_FOREGROUND + "control", Color.BLUE);
-                        break;
-                    case DATA:
-                        background = SystemProperties.getInstance().get(PROPERTY_PREFIX_BACKGROUND + "data", Color.GREEN);
-                        foreground = SystemProperties.getInstance().get(PROPERTY_PREFIX_FOREGROUND + "data", Color.BLUE);
-                        break;
-                    case ENCRYPTED:
-                        background = SystemProperties.getInstance().get(PROPERTY_PREFIX_BACKGROUND + "encrypted", Color.MAGENTA);
-                        foreground = SystemProperties.getInstance().get(PROPERTY_PREFIX_FOREGROUND + "encrypted", Color.WHITE);
-                        break;
-                    case FADE:
-                        background = SystemProperties.getInstance().get(PROPERTY_PREFIX_BACKGROUND + "fade", Color.LIGHT_GRAY.BLUE);
-                        foreground = SystemProperties.getInstance().get(PROPERTY_PREFIX_FOREGROUND + "fade", Color.YELLOW);
-                        break;
-                    case IDLE:
-                        background = SystemProperties.getInstance().get(PROPERTY_PREFIX_BACKGROUND + "idle", Color.WHITE);
-                        foreground = SystemProperties.getInstance().get(PROPERTY_PREFIX_FOREGROUND + "idle", Color.BLUE);
-                        break;
-                    case OVERFLOW:
-                        background = SystemProperties.getInstance().get(PROPERTY_PREFIX_BACKGROUND + "overflow", Color.RED);
-                        foreground = SystemProperties.getInstance().get(PROPERTY_PREFIX_FOREGROUND + "overflow", Color.YELLOW);
-                        break;
-                    case RESET:
-                        background = SystemProperties.getInstance().get(PROPERTY_PREFIX_BACKGROUND + "reset", Color.PINK);
-                        foreground = SystemProperties.getInstance().get(PROPERTY_PREFIX_FOREGROUND + "reset", Color.YELLOW);
-                        break;
-                    case TEARDOWN:
-                        background = SystemProperties.getInstance().get(PROPERTY_PREFIX_BACKGROUND + "teardown", Color.DARK_GRAY);
-                        foreground = SystemProperties.getInstance().get(PROPERTY_PREFIX_FOREGROUND + "teardown", Color.WHITE);
-                        break;
+                    background = mBackgroundColors.get(state);
+                }
+
+                if(mForegroundColors.containsKey(state))
+                {
+                    foreground = mForegroundColors.get(state);
                 }
             }
             else

src/main/java/io/github/dsheirer/channel/metadata/Metadata.java

@@ -41,6 +41,7 @@ public class Metadata
     protected boolean mUpdated;
     protected DecoderType mPrimaryDecoderType;
     protected boolean mSelected;
+    protected boolean mBufferOverflow;
     protected State mState = State.IDLE;
     protected String mChannelConfigurationSystem;
     protected String mChannelConfigurationSite;
@@ -173,6 +174,14 @@ public class Metadata
         return mSelected;
     }
 
+    /**
+     * Indicates if the channel for this metadata is in a buffer overflow state.
+     */
+    public boolean isBufferOverflow()
+    {
+        return mBufferOverflow;
+    }
+
     /**
      * List of de-duplicated broadcast channels aggregated from the primary and secondary TO/FROM aliases.
      */

src/main/java/io/github/dsheirer/channel/metadata/MutableMetadata.java

@@ -80,6 +80,10 @@ public class MutableMetadata extends Metadata implements Listener<AttributeChang
     {
         switch(request.getAttribute())
         {
+            case BUFFER_OVERFLOW:
+                mBufferOverflow = request.getBooleanValue();
+                broadcast(Attribute.BUFFER_OVERFLOW);
+                break;
             case CHANNEL_CONFIGURATION_SYSTEM:
                 mChannelConfigurationSystem = request.getStringValue();
                 broadcast(Attribute.CHANNEL_CONFIGURATION_SYSTEM);
@@ -164,6 +168,7 @@ public class MutableMetadata extends Metadata implements Listener<AttributeChang
     public void resetTemporalAttributes()
     {
         mDoNotRecord = null;
+        mBufferOverflow = false;
 
         if(hasMessage())
         {

src/main/java/io/github/dsheirer/channel/state/ChannelState.java

@@ -35,17 +35,16 @@ import io.github.dsheirer.module.decode.event.ICallEventProvider;
 import io.github.dsheirer.sample.IOverflowListener;
 import io.github.dsheirer.sample.Listener;
 import io.github.dsheirer.source.ISourceEventListener;
+import io.github.dsheirer.source.ISourceEventProvider;
 import io.github.dsheirer.source.SourceEvent;
 import io.github.dsheirer.source.heartbeat.Heartbeat;
 import io.github.dsheirer.source.heartbeat.IHeartbeatListener;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import static io.github.dsheirer.source.SourceEvent.Event.NOTIFICATION_FREQUENCY_CHANGE;
-
 public class ChannelState extends Module implements ICallEventProvider, IDecoderStateEventListener,
-    IDecoderStateEventProvider, ISourceEventListener, IHeartbeatListener, ISquelchStateProvider,
-    IAttributeChangeRequestListener, IOverflowListener
+    IDecoderStateEventProvider, ISourceEventListener, ISourceEventProvider, IHeartbeatListener,
+    ISquelchStateProvider, IAttributeChangeRequestListener, IOverflowListener
 {
     private final static Logger mLog = LoggerFactory.getLogger(ChannelState.class);
 
@@ -57,12 +56,13 @@ public class ChannelState extends Module implements ICallEventProvider, IDecoder
     private Listener<CallEvent> mCallEventListener;
     private Listener<DecoderStateEvent> mDecoderStateListener;
     private Listener<SquelchState> mSquelchStateListener;
+    private Listener<SourceEvent> mExternalSourceEventListener;
     private DecoderStateEventReceiver mDecoderStateEventReceiver = new DecoderStateEventReceiver();
     private HeartbeatReceiver mHeartbeatReceiver = new HeartbeatReceiver();
     private ChannelType mChannelType;
     private TrafficChannelManager mTrafficChannelEndListener;
     private CallEvent mTrafficChannelCallEvent;
-    private SourceChangeListener mSourceChangeListener;
+    private SourceEventListener mInternalSourceEventListener;
 
     private boolean mSquelchLocked = false;
     private boolean mSelected = false;
@@ -135,18 +135,7 @@ public class ChannelState extends Module implements ICallEventProvider, IDecoder
     @Override
     public void stop()
     {
-        mMutableMetadata.resetAllAttributes();
-
-        mTrafficChannelEndListener = null;
-
-        if(mTrafficChannelCallEvent != null)
-        {
-            mTrafficChannelCallEvent.end();
-            broadcast(mTrafficChannelCallEvent);
-        }
-
-        mTrafficChannelCallEvent = null;
-
+        processTeardownState();
         mSquelchLocked = false;
     }
 
@@ -160,12 +149,12 @@ public class ChannelState extends Module implements ICallEventProvider, IDecoder
     @Override
     public Listener<SourceEvent> getSourceEventListener()
     {
-        if(mSourceChangeListener == null)
+        if(mInternalSourceEventListener == null)
         {
-            mSourceChangeListener = new SourceChangeListener();
+            mInternalSourceEventListener = new SourceEventListener();
         }
 
-        return mSourceChangeListener;
+        return mInternalSourceEventListener;
     }
 
     private boolean isStandardChannel()
@@ -255,6 +244,17 @@ public class ChannelState extends Module implements ICallEventProvider, IDecoder
         }
     }
 
+    /**
+     * Broadcasts the source event to a registered external source event listener
+     */
+    protected void broadcast(SourceEvent sourceEvent)
+    {
+        if(mExternalSourceEventListener != null)
+        {
+            mExternalSourceEventListener.receive(sourceEvent);
+        }
+    }
+
     /**
      * Sets the squelch state listener
      */
@@ -292,6 +292,11 @@ public class ChannelState extends Module implements ICallEventProvider, IDecoder
         {
             switch(state)
             {
+                case ACTIVE:
+                    broadcast(SquelchState.SQUELCH);
+                    updateFadeTimeout();
+                    mState = state;
+                    break;
                 case CONTROL:
                     //Don't allow traffic channels to be control channels, otherwise they can't transition to teardown
                     if(isStandardChannel())
@@ -328,8 +333,7 @@ public class ChannelState extends Module implements ICallEventProvider, IDecoder
                     break;
             }
 
-            mMutableMetadata.receive(new AttributeChangeRequest<State>(Attribute.CHANNEL_STATE,
-                mSourceOverflow ? State.OVERFLOW : mState));
+            mMutableMetadata.receive(new AttributeChangeRequest<State>(Attribute.CHANNEL_STATE, mState));
         }
     }
 
@@ -352,8 +356,19 @@ public class ChannelState extends Module implements ICallEventProvider, IDecoder
     {
         mSourceOverflow = overflow;
 
-        mMutableMetadata.receive(new AttributeChangeRequest<State>(Attribute.CHANNEL_STATE,
-            mSourceOverflow ? State.OVERFLOW : mState));
+        mMutableMetadata.receive(new AttributeChangeRequest<Boolean>(Attribute.BUFFER_OVERFLOW, mSourceOverflow));
+    }
+
+    /**
+     * Indicates if this channel's sample buffer is in overflow state, meaning that the inbound sample
+     * stream is not being processed fast enough and samples are being thrown away until the processing can
+     * catch up.
+     *
+     * @return true if the channel is in overflow state.
+     */
+    public boolean isOverflow()
+    {
+        return mSourceOverflow;
     }
 
     /**
@@ -392,9 +407,13 @@ public class ChannelState extends Module implements ICallEventProvider, IDecoder
 
         mMutableMetadata.receive(new AttributeChangeRequest<State>(Attribute.CHANNEL_STATE, mState));
 
-        if(mTrafficChannelEndListener != null)
+        if(mTrafficChannelEndListener != null && mTrafficChannelCallEvent != null)
         {
+            mTrafficChannelCallEvent.end();
+            broadcast(mTrafficChannelCallEvent);
             mTrafficChannelEndListener.callEnd(mTrafficChannelCallEvent.getChannel());
+            mTrafficChannelEndListener = null;
+            mTrafficChannelCallEvent = null;
         }
     }
 
@@ -516,18 +535,46 @@ public class ChannelState extends Module implements ICallEventProvider, IDecoder
     }
 
     /**
-     * Listener to receive frequency change events and rebroadcast them to the decoder states
+     * Registers the listener to receive source events from the channel state
      */
-    public class SourceChangeListener implements Listener<SourceEvent>
+    @Override
+    public void setSourceEventListener(Listener<SourceEvent> listener)
+    {
+        mExternalSourceEventListener = listener;
+    }
+
+    /**
+     * De-Registers a listener from receiving source events from the channel state
+     */
+    @Override
+    public void removeSourceEventListener()
+    {
+        mExternalSourceEventListener = null;
+    }
+
+    /**
+     * Listener to receive source events.
+     */
+    public class SourceEventListener implements Listener<SourceEvent>
     {
         @Override
         public void receive(SourceEvent sourceEvent)
         {
-            if(sourceEvent.getEvent() == NOTIFICATION_FREQUENCY_CHANGE)
+            switch(sourceEvent.getEvent())
             {
-                long frequency = sourceEvent.getValue().longValue();
-
-                broadcast(new DecoderStateEvent(this, Event.SOURCE_FREQUENCY, getState(), frequency));
+                case NOTIFICATION_FREQUENCY_CHANGE:
+                    //Rebroadcast source frequency change events for the decoder(s) to process
+                    long frequency = sourceEvent.getValue().longValue();
+                    broadcast(new DecoderStateEvent(this, Event.SOURCE_FREQUENCY, getState(), frequency));
+                    break;
+                case NOTIFICATION_MEASURED_FREQUENCY_ERROR:
+                    //Rebroadcast frequency error measurements to external listener if we're currently
+                    //in an active (ie sync locked) state.
+                    if(getState().isActiveState())
+                    {
+                        broadcast(SourceEvent.frequencyErrorMeasurementSyncLocked(sourceEvent.getValue().longValue(), mChannelType.name()));
+                    }
+                    break;
             }
         }
     }

src/main/java/io/github/dsheirer/channel/state/State.java

@@ -24,62 +24,109 @@ import java.util.EnumSet;
  */
 public enum State
 {
-    IDLE("IDLE")
+    /**
+     * Active state indicates that valid messages are being decoded that do not indicate any call or data
+     * activity.  For example, this is used for P25 when a channel is actively transmitting Terminator Data
+     * Units in between data packets or at the beginning or end of a call.
+     */
+    ACTIVE("ACTIVE")
         {
             @Override
             public boolean canChangeTo(State state)
             {
-                return state != TEARDOWN && state != RESET && state != OVERFLOW;
+                return state == CALL ||
+                       state == CONTROL ||
+                       state == DATA ||
+                       state == ENCRYPTED ||
+                       state == FADE ||
+                       state == TEARDOWN;
             }
         },
+    /**
+     * Indicates that call messages are being decoded, or a call is in progress (ie producing audio).
+     */
     CALL("CALL")
         {
             @Override
             public boolean canChangeTo(State state)
             {
-                return state == CONTROL || state == DATA || state == ENCRYPTED || state == FADE || state == TEARDOWN;
-            }
-        },
-    DATA("DATA")
-        {
-            @Override
-            public boolean canChangeTo(State state)
-            {
-                return state == CALL || state == CONTROL || state == ENCRYPTED || state == FADE || state == TEARDOWN;
-            }
-        },
-    ENCRYPTED("ENCRYPTED")
-        {
-            @Override
-            public boolean canChangeTo(State state)
-            {
-                return state == FADE || state == TEARDOWN;
+                return state == ACTIVE ||
+                       state == CONTROL ||
+                       state == DATA ||
+                       state == ENCRYPTED ||
+                       state == FADE ||
+                       state == TEARDOWN;
             }
         },
+    /**
+     * Indicates a trunking control channel is being decoded.
+     */
     CONTROL("CONTROL")
         {
             @Override
             public boolean canChangeTo(State state)
             {
-                return state == IDLE || state == FADE;
+                return state == IDLE ||
+                       state == FADE;
             }
         },
+    /**
+     * Indicates data packets are being decoded
+     */
+    DATA("DATA")
+        {
+            @Override
+            public boolean canChangeTo(State state)
+            {
+                return state == ACTIVE ||
+                       state == CALL ||
+                       state == CONTROL ||
+                       state == ENCRYPTED ||
+                       state == FADE ||
+                       state == TEARDOWN;
+            }
+        },
+    /**
+     * Indicates encrypted audio is detected.
+     */
+    ENCRYPTED("ENCRYPTED")
+        {
+            @Override
+            public boolean canChangeTo(State state)
+            {
+                return state == FADE ||
+                       state == TEARDOWN;
+            }
+        },
+    /**
+     * Fade state occurs when the channel is no longer actively decoding an messages.  This is a transitory
+     * state before transition to IDLE or back to an active state.
+     */
     FADE("FADE")
         {
             @Override
             public boolean canChangeTo(State state)
             {
-                return state != FADE && state != RESET && state != OVERFLOW;
+                return state != FADE &&
+                       state != RESET;
             }
         },
-    OVERFLOW("OVERFLOW")
+    /**
+     * Indicates the channel is idle and not actively decoding any messages
+     */
+    IDLE("IDLE")
         {
             @Override
             public boolean canChangeTo(State state)
             {
-                return false;
+                return state != TEARDOWN &&
+                       state != RESET;
             }
         },
+
+    /**
+     * Indicates that the channel has been reset and is ready to use for a new decoding session.
+     */
     RESET("RESET")
         {
             @Override
@@ -88,6 +135,10 @@ public enum State
                 return state == IDLE;
             }
         },
+    /**
+     * Call or data teardown.  This state is used by traffic channels to indicate that a call or data session
+     * has concluded and the channel is ready for tear down and reuse.
+     */
     TEARDOWN("TEARDOWN")
         {
             @Override
@@ -99,7 +150,7 @@ public enum State
 
     private String mDisplayValue;
 
-    public static final EnumSet<State> CALL_STATES = EnumSet.of(CALL, CONTROL, DATA, ENCRYPTED);
+    public static final EnumSet<State> CALL_STATES = EnumSet.of(ACTIVE, CALL, CONTROL, DATA, ENCRYPTED);
     public static final EnumSet<State> IDLE_STATES = EnumSet.of(IDLE, FADE);
 
     private State(String displayValue)
@@ -109,8 +160,25 @@ public enum State
 
     public abstract boolean canChangeTo(State state);
 
+    /**
+     * Indicates that this state is an active (ie decoding) state and is one of the states
+     * enumerated in the CALL_STATES enumeration set.
+     *
+     * @return true if this state is an active state
+     */
+    public boolean isActiveState()
+    {
+        return CALL_STATES.contains(this);
+    }
+
     public String getDisplayValue()
     {
         return mDisplayValue;
     }
+
+    @Override
+    public String toString()
+    {
+        return mDisplayValue;
+    }
 }

src/main/java/io/github/dsheirer/channel/traffic/TrafficChannelManager.java

@@ -186,7 +186,7 @@ public class TrafficChannelManager extends Module implements ICallEventProvider,
             if(frequency > 0)
             {
                 Channel channel = getChannel(callEvent.getChannel(), new TunerChannel(frequency,
-                    mDecodeConfiguration.getDecoderType().getChannelBandwidth()));
+                    mDecodeConfiguration.getChannelSpecification().getBandwidth()));
 
                 if(channel != null)
                 {

src/main/java/io/github/dsheirer/controller/channel/Channel.java

@@ -489,14 +489,14 @@ public class Channel extends Configuration implements Listener<SourceEvent>
                 SourceConfigTuner config = (SourceConfigTuner)mSourceConfiguration;
 
                 mTunerChannel = new TunerChannel(config.getFrequency(),
-                    mDecodeConfiguration.getDecoderType().getChannelBandwidth());
+                    mDecodeConfiguration.getChannelSpecification().getBandwidth());
             }
             else if(mSourceConfiguration.getSourceType() == SourceType.RECORDING)
             {
                 SourceConfigRecording config = (SourceConfigRecording)mSourceConfiguration;
 
                 mTunerChannel = new TunerChannel(config.getFrequency(),
-                    mDecodeConfiguration.getDecoderType().getChannelBandwidth());
+                    mDecodeConfiguration.getChannelSpecification().getBandwidth());
             }
         }
 

src/main/java/io/github/dsheirer/controller/channel/ChannelController.java

@@ -1,3 +1,18 @@
+/*******************************************************************************
+ * sdr-trunk
+ * Copyright (C) 2014-2018 Dennis Sheirer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by  the Free Software Foundation, either version 3 of the License, or  (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful,  but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License  along with this program.
+ * If not, see <http://www.gnu.org/licenses/>
+ *
+ ******************************************************************************/
 package io.github.dsheirer.controller.channel;
 
 import com.jidesoft.swing.JideSplitPane;
@@ -24,8 +39,7 @@ import java.awt.Rectangle;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 
-public class ChannelController extends JPanel 
-				implements ActionListener, ListSelectionListener
+public class ChannelController extends JPanel implements ActionListener, ListSelectionListener
 {
 	private static final long serialVersionUID = 1L;
 
@@ -168,9 +182,13 @@ public class ChannelController extends JPanel
 		if( index >= 0 )
 		{
 			int translatedIndex = mChannelTable.convertRowIndexToView( index );
-			mChannelTable.setRowSelectionInterval( translatedIndex, translatedIndex );
-			mChannelTable.scrollRectToVisible( 
-				new Rectangle( mChannelTable.getCellRect( translatedIndex, 0, true ) ) );
+
+			if(translatedIndex >= 0)
+			{
+				mChannelTable.setRowSelectionInterval( translatedIndex, translatedIndex );
+				mChannelTable.scrollRectToVisible(
+					new Rectangle( mChannelTable.getCellRect( translatedIndex, 0, true ) ) );
+			}
 		}
 	}
 	

src/main/java/io/github/dsheirer/controller/channel/ChannelProcessingManager.java

@@ -33,6 +33,7 @@ import io.github.dsheirer.module.decode.event.MessageActivityModel;
 import io.github.dsheirer.module.log.EventLogManager;
 import io.github.dsheirer.record.RecorderManager;
 import io.github.dsheirer.record.RecorderType;
+import io.github.dsheirer.record.binary.BinaryRecorder;
 import io.github.dsheirer.sample.Listener;
 import io.github.dsheirer.sample.buffer.ReusableAudioPacket;
 import io.github.dsheirer.source.Source;
@@ -211,7 +212,7 @@ public class ChannelProcessingManager implements ChannelEventListener
         try
         {
             source = mSourceManager.getSource(channel.getSourceConfiguration(),
-                channel.getDecodeConfiguration().getDecoderType().getChannelBandwidth());
+                channel.getDecodeConfiguration().getChannelSpecification());
         }
         catch(SourceException se)
         {
@@ -308,6 +309,25 @@ public class ChannelProcessingManager implements ChannelEventListener
             {
                 processingChain.addModule(mRecorderManager.getBasebandRecorder(channel.toString()));
             }
+
+            /* Add decoded bit stream recorder if the decoder supports bitstream output */
+            if(DecoderFactory.getBitstreamDecoders().contains(channel.getDecodeConfiguration().getDecoderType()))
+            {
+                if((recorders.contains(RecorderType.DEMODULATED_BIT_STREAM) &&
+                    channel.getChannelType() == Channel.ChannelType.STANDARD))
+                {
+                    processingChain.addModule(new BinaryRecorder(mRecorderManager.getRecordingBasePath(),
+                        channel.toString()));
+                }
+
+                /* Add traffic channel decoded bit stream recorder */
+                if(recorders.contains(RecorderType.TRAFFIC_DEMODULATED_BIT_STREAM) &&
+                    channel.getChannelType() == Channel.ChannelType.TRAFFIC)
+                {
+                    processingChain.addModule(new BinaryRecorder(mRecorderManager.getRecordingBasePath(),
+                        channel.toString()));
+                }
+            }
         }
 
         processingChain.setSource(source);

src/main/java/io/github/dsheirer/dsp/afsk/AFSK1200Decoder.java

@@ -21,7 +21,7 @@ import io.github.dsheirer.dsp.filter.resample.RealResampler;
 import io.github.dsheirer.dsp.mixer.IOscillator;
 import io.github.dsheirer.dsp.mixer.Oscillator;
 import io.github.dsheirer.sample.Listener;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -34,7 +34,7 @@ import org.slf4j.LoggerFactory;
  *
  * Provides normal or inverted decoded output.
  */
-public class AFSK1200Decoder implements Listener<ReusableBuffer>
+public class AFSK1200Decoder implements Listener<ReusableFloatBuffer>
 {
     private final static Logger mLog = LoggerFactory.getLogger(AFSK1200Decoder.class);
 
@@ -110,7 +110,7 @@ public class AFSK1200Decoder implements Listener<ReusableBuffer>
      * @param buffer containing 8.0 kHz unfiltered FM demodulated audio samples with sub-audible LTR signalling.
      */
     @Override
-    public void receive(ReusableBuffer buffer)
+    public void receive(ReusableFloatBuffer buffer)
     {
         mResampler.resample(buffer);
     }
@@ -142,10 +142,10 @@ public class AFSK1200Decoder implements Listener<ReusableBuffer>
     }
 
 
-    public class Decoder implements Listener<ReusableBuffer>
+    public class Decoder implements Listener<ReusableFloatBuffer>
     {
         @Override
-        public void receive(ReusableBuffer buffer)
+        public void receive(ReusableFloatBuffer buffer)
         {
             //Calculate correlation values against each 1200/1800 reference signal
             mCorrelationValuesMark = mCorrelatorMark.process(buffer);
@@ -212,17 +212,17 @@ public class AFSK1200Decoder implements Listener<ReusableBuffer>
          * Processes each sample in the incoming sample buffer against a generated reference sample set for one symbol
          * period to derive a correlation value that is in-turn averaged over one symbol period.
          *
-         * @param reusableBuffer containing FM demodulated samples
+         * @param reusableFloatBuffer containing FM demodulated samples
          * @return a reusable array of correlation values for each sample
          */
-        public float[] process(ReusableBuffer reusableBuffer)
+        public float[] process(ReusableFloatBuffer reusableFloatBuffer)
         {
-            if(mCorrelationValues == null || mCorrelationValues.length != reusableBuffer.getSampleCount())
+            if(mCorrelationValues == null || mCorrelationValues.length != reusableFloatBuffer.getSampleCount())
             {
-                mCorrelationValues = new float[reusableBuffer.getSampleCount()];
+                mCorrelationValues = new float[reusableFloatBuffer.getSampleCount()];
             }
 
-            float[] samples = reusableBuffer.getSamples();
+            float[] samples = reusableFloatBuffer.getSamples();
 
             int y;
 

src/main/java/io/github/dsheirer/dsp/am/AMDemodulator.java

@@ -15,9 +15,9 @@
  ******************************************************************************/
 package io.github.dsheirer.dsp.am;
 
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
 import io.github.dsheirer.sample.buffer.ReusableBufferQueue;
 import io.github.dsheirer.sample.buffer.ReusableComplexBuffer;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 
 /**
  * Performs AM demodulation on baseband I/Q samples to produce demodulated float output.
@@ -63,11 +63,11 @@ public class AMDemodulator
      * @param complexBuffer to demodulate
      * @return demodulated audio buffer.
      */
-    public ReusableBuffer demodulate(ReusableComplexBuffer complexBuffer)
+    public ReusableFloatBuffer demodulate(ReusableComplexBuffer complexBuffer)
     {
-        ReusableBuffer reusableBuffer = mReusableBufferQueue.getBuffer(complexBuffer.getSampleCount());
+        ReusableFloatBuffer reusableFloatBuffer = mReusableBufferQueue.getBuffer(complexBuffer.getSampleCount());
         float[] input = complexBuffer.getSamples();
-        float[] output = reusableBuffer.getSamples();
+        float[] output = reusableFloatBuffer.getSamples();
         mOutputBufferPointer = 0;
 
         for(int x= 0; x < complexBuffer.getSamples().length; x += 2)
@@ -77,6 +77,6 @@ public class AMDemodulator
 
         complexBuffer.decrementUserCount();
 
-        return reusableBuffer;
+        return reusableFloatBuffer;
     }
 }

src/main/java/io/github/dsheirer/dsp/filter/FilterFactory.java

@@ -22,7 +22,6 @@
  ******************************************************************************/
 package io.github.dsheirer.dsp.filter;
 
-import io.github.dsheirer.dsp.filter.cic.ComplexPrimeCICDecimate;
 import io.github.dsheirer.dsp.filter.design.FilterDesignException;
 import io.github.dsheirer.dsp.filter.fir.FIRFilterSpecification;
 import io.github.dsheirer.dsp.filter.fir.remez.RemezFIRFilterDesigner;
@@ -358,15 +357,6 @@ public class FilterFactory
         return (int)(Math.round((double)attenuation / (22.0d * frequency)));
     }
 
-    public static ComplexPrimeCICDecimate getDecimationFilter(int sampleRate, int decimatedRate, int order,
-                                                              int passFrequency, int attenuation, Window.WindowType windowType)
-    {
-        int decimationRate = (int)(sampleRate / decimatedRate);
-
-        return new ComplexPrimeCICDecimate(decimationRate, order,
-            passFrequency, attenuation, windowType);
-    }
-
     /**
      * Determines decimation rate(s) for a polyphase decimation filter.
      *
@@ -760,26 +750,28 @@ public class FilterFactory
      * Polyphase M2 synthesizer sync filter.  Designed for multiple M2 oversampled channel inputs and
      * an M*channel count output.
      *
-     * @param channelBandwidth per channel
-     * @param channels count
+     * @param channelSampleRate per input channel
+     * @param channelBandwidth per input channel
+     * @param channels input count
      * @param tapsPerChannel minumum.  This may be increased to meet the band edge -6.02dB requirement
      * @return filter
      * @throws FilterDesignException
      */
-    public static float[] getSincM2Synthesizer(double channelBandwidth, int channels, int tapsPerChannel)
-        throws FilterDesignException
+    public static float[] getSincM2Synthesizer(double channelSampleRate, double channelBandwidth, int channels,
+                                               int tapsPerChannel) throws FilterDesignException
     {
         int filterLength = (channels * tapsPerChannel) - 1;
 
+        double cutoff = (channelBandwidth * 1.10) / (channelSampleRate * (double)channels);
+
         //Design the prototype synthesizer with 105% of the channel bandwidth produced by the channelizer.
-        float[] taps = FilterFactory.getKaiserSinc(filterLength, channelBandwidth * 1.05, 80.0);
+        float[] taps = FilterFactory.getKaiserSinc(filterLength, cutoff, 80.0);
 
         //This is an odd length filter - increase the length by 1 by pre-padding a zero coefficient
         float[] extendedTaps = new float[taps.length + 1];
         System.arraycopy(taps, 0, extendedTaps, 1, taps.length);
 
-        //Adjust the overall gain of the filter to an objective of 1.0 divided by the number of channels
-        return normalize(extendedTaps, 1.0f);
+        return extendedTaps;
     }
 
     /**
@@ -918,17 +910,18 @@ public class FilterFactory
             mLog.debug("Filter Length: " + (extendedTaps.length));
             mLog.debug("Requested Cutoff Frequency:  " + (sampleRate * bandEdge));
             mLog.debug("Actual Cutoff Frequency:  " + (sampleRate * cutoffFrequency));
-            mLog.debug("Attenuation at 0.0 OBJECTIVE:  " + 0.0);
-            mLog.debug("Attenuation at 1.0 OBJECTIVE:  " + PERFECT_RECONSTRUCTION_GAIN_AT_BAND_EDGE);
-            mLog.debug("Attenuation at 1.00 Channels:  " + evaluate(taps, bandEdge * 1.00) + "\tFrequency: " + (sampleRate * bandEdge * 1.0));
-            mLog.debug("Attenuation at 1.25 Channels:  " + evaluate(taps, bandEdge * 1.25) + "\tFrequency: " + (sampleRate * bandEdge * 1.25));
-            mLog.debug("Attenuation at 1.50 Channels:  " + evaluate(taps, bandEdge * 1.50) + "\tFrequency: " + (sampleRate * bandEdge * 1.5));
-            mLog.debug("Attenuation at 1.75 Channels:  " + evaluate(taps, bandEdge * 1.75) + "\tFrequency: " + (sampleRate * bandEdge * 1.75));
-            mLog.debug("Attenuation at 2.00 Channels:  " + evaluate(taps, bandEdge * 2.00) + "\tFrequency: " + (sampleRate * bandEdge * 2.0));
+            mLog.debug("Attenuation at 0.25 Channels:  " + evaluate(taps, bandEdge * 0.25) + "\tFrequency: " + (sampleRate * bandEdge * 0.25) + "  [" + (bandEdge * 0.25) + "]");
+            mLog.debug("Attenuation at 0.50 Channels:  " + evaluate(taps, bandEdge * 0.50) + "\tFrequency: " + (sampleRate * bandEdge * 0.50) + "  [" + (bandEdge * 0.50) + "]");
+            mLog.debug("Attenuation at 0.75 Channels:  " + evaluate(taps, bandEdge * 0.75) + "\tFrequency: " + (sampleRate * bandEdge * 0.75) + "  [" + (bandEdge * 0.75) + "]");
+            mLog.debug("Attenuation        OBJECTIVE:  " + PERFECT_RECONSTRUCTION_GAIN_AT_BAND_EDGE);
+            mLog.debug("Attenuation at 1.00 Channels:  " + evaluate(taps, bandEdge * 1.00) + "\tFrequency: " + (sampleRate * bandEdge * 1.0) + "  [" + (bandEdge * 1.0) + "]");
+            mLog.debug("Attenuation at 1.25 Channels:  " + evaluate(taps, bandEdge * 1.25) + "\tFrequency: " + (sampleRate * bandEdge * 1.25) + "  [" + (bandEdge * 1.25) + "]");
+            mLog.debug("Attenuation at 1.50 Channels:  " + evaluate(taps, bandEdge * 1.50) + "\tFrequency: " + (sampleRate * bandEdge * 1.5) + "  [" + (bandEdge * 1.5) + "]");
+            mLog.debug("Attenuation at 1.75 Channels:  " + evaluate(taps, bandEdge * 1.75) + "\tFrequency: " + (sampleRate * bandEdge * 1.75) + "  [" + (bandEdge * 1.75) + "]");
+            mLog.debug("Attenuation at 2.00 Channels:  " + evaluate(taps, bandEdge * 2.00) + "\tFrequency: " + (sampleRate * bandEdge * 2.0) + "  [" + (bandEdge * 2.0) + "]");
         }
 
-        //Adjust the overall gain of the filter to an objective of 1.0 times the number of channels
-        return normalize(extendedTaps, 1.0f * (float)channels);
+        return extendedTaps;
     }
 
     /**

src/main/java/io/github/dsheirer/dsp/filter/Filters.java

@@ -1719,7 +1719,32 @@ public enum Filters
 		 0.011873357051047719f, 0.0f, -0.007901319195893647f, 0.0f,
 		 0.005055504379767936f, 0.0f, -0.003054430179754289f, 0.0f,
 		 0.001695637278417295f, 0.0f, -0.000998606272947510f 
-	} );
+	}),
+
+	/**
+	 *         FIRFilterSpecification specification = FIRFilterSpecification.lowPassBuilder()
+	 *             .sampleRate(100)
+	 *             .gridDensity(16)
+	 *             .oddLength(true)
+	 *             .passBandCutoff(21)
+	 *             .passBandAmplitude(1.0)
+	 *             .passBandRipple(0.01)
+	 *             .stopBandStart(29)
+	 *             .stopBandAmplitude(0.0)
+	 *             .stopBandRipple(0.01) //Approximately -85 dB suppression
+	 *             .build();
+ 	 */
+	HALF_BAND_FILTER_27T(new float[]
+	{
+		 0.007495115f, 0.0f, -0.011045938f, 0.0f,
+		 0.019129561f, 0.0f, -0.031747308f, 0.0f,
+		 0.053220540f, 0.0f, -0.099569574f, 0.0f,
+		 0.316083550f, 0.5f,  0.316083550f, 0.0f,
+		-0.099569574f, 0.0f,  0.053220540f, 0.0f,
+		-0.031747308f, 0.0f,  0.019129561f, 0.0f,
+		-0.011045938f, 0.0f,  0.007495115f
+
+	});
 	
 	float[] mCoefficients;
 	

src/main/java/io/github/dsheirer/dsp/filter/channelizer/ComplexPolyphaseChannelizerM2.java

@@ -63,7 +63,7 @@ public class ComplexPolyphaseChannelizerM2 extends AbstractComplexPolyphaseChann
 {
     private final static Logger mLog = LoggerFactory.getLogger(ComplexPolyphaseChannelizerM2.class);
 
-    private static final int DEFAULT_MINIMUM_CHANNEL_BANDWIDTH = 12500;
+    private static final int DEFAULT_MINIMUM_CHANNEL_BANDWIDTH = 25000;
 
     //Sized at 152 buffers a second where max = 5 seconds and reset = 2 seconds worth of buffers
     private IFFTProcessor mIFFTProcessor = new IFFTProcessor((5 * 152), (2 * 152));

src/main/java/io/github/dsheirer/dsp/filter/channelizer/ContinuousBufferProcessor.java

@@ -136,6 +136,46 @@ public class ContinuousBufferProcessor<E> implements Listener<E>
         }
     }
 
+    /**
+     * Stops this buffer processor,stops queuing of incoming buffers and flushes the internal buffer queue
+     * contents to the listener.
+     */
+    public void flushAndStop()
+    {
+        if(mRunning.compareAndSet(true, false))
+        {
+            if(mScheduledFuture != null)
+            {
+                mScheduledFuture.cancel(true);
+                mScheduledFuture = null;
+            }
+
+            process();
+        }
+    }
+
+    /**
+     * Distributes queued buffers to the listener
+     */
+    private void process()
+    {
+        List<E> buffers = new ArrayList<>();
+
+        try
+        {
+            mQueue.drainTo(buffers);
+
+            if(mListener != null)
+            {
+                mListener.receive(buffers);
+            }
+        }
+        catch(Throwable throwable)
+        {
+            mLog.error("Error while dispatching buffers to listener", throwable);
+        }
+    }
+
     /**
      * Clears any buffers from the queue
      */
@@ -162,21 +202,7 @@ public class ContinuousBufferProcessor<E> implements Listener<E>
         @Override
         public void run()
         {
-            List<E> buffers = new ArrayList<>();
-
-            try
-            {
-                mQueue.drainTo(buffers);
-
-                if(mListener != null)
-                {
-                    mListener.receive(buffers);
-                }
-            }
-            catch(Throwable throwable)
-            {
-                mLog.error("Error while dispatching buffers to listeners", throwable);
-            }
+            process();
         }
     }
 }

src/main/java/io/github/dsheirer/dsp/filter/channelizer/ContinuousReusableBufferProcessor.java

@@ -15,10 +15,10 @@
  ******************************************************************************/
 package io.github.dsheirer.dsp.filter.channelizer;
 
+import io.github.dsheirer.sample.buffer.AbstractReusableBuffer;
 import io.github.dsheirer.sample.buffer.OverflowableReusableBufferTransferQueue;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
 
-public class ContinuousReusableBufferProcessor<T extends ReusableBuffer> extends ContinuousBufferProcessor<T>
+public class ContinuousReusableBufferProcessor<T extends AbstractReusableBuffer> extends ContinuousBufferProcessor<T>
 {
     /**
      * Scheduled Reusable Buffer Processor combines an internal overflowable buffer with a scheduled runnable processing

src/main/java/io/github/dsheirer/dsp/filter/channelizer/PolyphaseChannelManager.java

@@ -29,12 +29,12 @@ import io.github.dsheirer.source.Source;
 import io.github.dsheirer.source.SourceEvent;
 import io.github.dsheirer.source.SourceException;
 import io.github.dsheirer.source.tuner.TunerController;
+import io.github.dsheirer.source.tuner.channel.ChannelSpecification;
 import io.github.dsheirer.source.tuner.channel.TunerChannel;
 import io.github.dsheirer.source.tuner.channel.TunerChannelSource;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -63,7 +63,7 @@ import java.util.concurrent.CopyOnWriteArrayList;
 public class PolyphaseChannelManager implements ISourceEventProcessor
 {
     private final static Logger mLog = LoggerFactory.getLogger(PolyphaseChannelManager.class);
-    private static final double MINIMUM_CHANNEL_BANDWIDTH = 12500.0;
+    private static final double MINIMUM_CHANNEL_BANDWIDTH = 25000.0;
     private static final double CHANNEL_OVERSAMPLING = 2.0;
     private static final int POLYPHASE_CHANNELIZER_TAPS_PER_CHANNEL = 9;
     private static final int POLYPHASE_SYNTHESIZER_TAPS_PER_CHANNEL = 9;
@@ -142,7 +142,7 @@ public class PolyphaseChannelManager implements ISourceEventProcessor
      * @param tunerChannel specifying center frequency and bandwidth.
      * @return source or null.
      */
-    public TunerChannelSource getChannel(TunerChannel tunerChannel)
+    public TunerChannelSource getChannel(TunerChannel tunerChannel, ChannelSpecification channelSpecification)
     {
         PolyphaseChannelSource channelSource = null;
 
@@ -156,10 +156,17 @@ public class PolyphaseChannelManager implements ISourceEventProcessor
             {
                 long centerFrequency = mChannelCalculator.getCenterFrequencyForIndexes(polyphaseIndexes);
 
-                channelSource = new PolyphaseChannelSource(tunerChannel, outputProcessor, mChannelSourceEventListener,
-                    mChannelCalculator.getChannelSampleRate(), centerFrequency);
+                try
+                {
+                    channelSource = new PolyphaseChannelSource(tunerChannel, outputProcessor, mChannelSourceEventListener,
+                        mChannelCalculator.getChannelSampleRate(), centerFrequency, channelSpecification);
 
-                mChannelSources.add(channelSource);
+                    mChannelSources.add(channelSource);
+                }
+                catch(FilterDesignException fde)
+                {
+                    mLog.debug("Couldn't design final output low pass filter for polyphase channel source");
+                }
             }
         }
         catch(IllegalArgumentException iae)
@@ -172,36 +179,6 @@ public class PolyphaseChannelManager implements ISourceEventProcessor
         return channelSource;
     }
 
-    public TunerChannelSource getTestChannel(int index)
-    {
-        PolyphaseChannelSource channelSource = null;
-
-        try
-        {
-            List<Integer> polyphaseIndexes = new ArrayList<>();
-            polyphaseIndexes.add(index);
-
-            IPolyphaseChannelOutputProcessor outputProcessor = getOutputProcessor(polyphaseIndexes);
-
-
-            if(outputProcessor != null)
-            {
-                long centerFrequency = mChannelCalculator.getCenterFrequencyForIndexes(polyphaseIndexes);
-
-                TunerChannel tunerChannel = new TunerChannel(centerFrequency, 12500);
-
-                channelSource = new PolyphaseChannelSource(tunerChannel, outputProcessor, mChannelSourceEventListener,
-                    mChannelCalculator.getChannelSampleRate(), centerFrequency);
-            }
-        }
-        catch(IllegalArgumentException iae)
-        {
-            mLog.error("Couldn't get test channel with index:" + index, iae);
-        }
-
-        return channelSource;
-    }
-
     /**
      * Creates a processor to process the channelizer channel indexes into a composite output stream providing
      * channelized complex sample buffers to a registered source listener.
@@ -213,12 +190,14 @@ public class PolyphaseChannelManager implements ISourceEventProcessor
         switch(indexes.size())
         {
             case 1:
-                return new OneChannelOutputProcessor(mChannelCalculator.getChannelSampleRate(), indexes);
+                return new OneChannelOutputProcessor(mChannelCalculator.getChannelSampleRate(), indexes,
+                    mChannelCalculator.getChannelCount());
             case 2:
                 try
                 {
                     float[] filter = getOutputProcessorFilter(2);
-                    return new TwoChannelOutputProcessor(mChannelCalculator.getChannelSampleRate(), indexes, filter);
+                    return new TwoChannelOutputProcessor(mChannelCalculator.getChannelSampleRate(), indexes, filter,
+                        mChannelCalculator.getChannelCount());
                 }
                 catch(FilterDesignException fde)
                 {
@@ -314,7 +293,7 @@ public class PolyphaseChannelManager implements ISourceEventProcessor
             case NOTIFICATION_SAMPLE_RATE_CHANGE:
                 //Update channel calculator immediately so that channels can be allocated
                 double sampleRate = sourceEvent.getValue().doubleValue();
-                int channelCount = (int)Math.ceil(sampleRate / MINIMUM_CHANNEL_BANDWIDTH);
+                int channelCount = ComplexPolyphaseChannelizerM2.getChannelCount(sampleRate);
                 mChannelCalculator.setRates(sampleRate, channelCount);
                 break;
             case NOTIFICATION_FREQUENCY_AND_SAMPLE_RATE_LOCKED:
@@ -504,8 +483,8 @@ public class PolyphaseChannelManager implements ISourceEventProcessor
 
         if(taps == null)
         {
-            taps = FilterFactory.getSincM2Synthesizer(mChannelCalculator.getChannelBandwidth(), channels,
-                POLYPHASE_SYNTHESIZER_TAPS_PER_CHANNEL);
+            taps = FilterFactory.getSincM2Synthesizer(mChannelCalculator.getChannelSampleRate(),
+                mChannelCalculator.getChannelBandwidth(), channels, POLYPHASE_SYNTHESIZER_TAPS_PER_CHANNEL);
 
             mOutputProcessorFilters.put(channels, taps);
         }
@@ -556,6 +535,10 @@ public class PolyphaseChannelManager implements ISourceEventProcessor
                 case NOTIFICATION_FREQUENCY_CORRECTION_CHANGE:
                     //ignore
                     break;
+                case NOTIFICATION_MEASURED_FREQUENCY_ERROR_SYNC_LOCKED:
+                    //Rebroadcast so that the tuner source can process this event
+                    mSourceEventBroadcaster.broadcast(sourceEvent);
+                    break;
                 default:
                     mLog.error("Received unrecognized source event from polyphase channel source [" +
                         sourceEvent.getEvent() + "]");

src/main/java/io/github/dsheirer/dsp/filter/channelizer/PolyphaseChannelResultsBuffer.java

@@ -1,171 +0,0 @@
-/*******************************************************************************
- * sdr-trunk
- * Copyright (C) 2014-2018 Dennis Sheirer
- *
- * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
- * License as published by  the Free Software Foundation, either version 3 of the License, or  (at your option) any
- * later version.
- *
- * This program is distributed in the hope that it will be useful,  but WITHOUT ANY WARRANTY; without even the implied
- * warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License  along with this program.
- * If not, see <http://www.gnu.org/licenses/>
- *
- ******************************************************************************/
-package io.github.dsheirer.dsp.filter.channelizer;
-
-import java.util.Arrays;
-
-public class PolyphaseChannelResultsBuffer
-{
-    private long mTimestamp;
-    private int mPointer = 0;
-    private int mMaxSize;
-    private float[][] mChannelResults;
-
-    /**
-     * Buffer containing an array of polyphase channelizer complex channel results.
-     * @param timestamp reference relative to the first channel results.
-     * @param maxSize of channel results to store in this buffer
-     */
-    public PolyphaseChannelResultsBuffer(long timestamp, int maxSize)
-    {
-        mTimestamp = timestamp;
-        mMaxSize = maxSize;
-    }
-
-    /**
-     * Reference timestamp relative to the first channel results contained in this buffer.
-     * @return reference timestamp in milliseconds since epoch
-     */
-    public long getTimestamp()
-    {
-        return mTimestamp;
-    }
-
-    /**
-     * Indicates if this buffer is full
-     */
-    public boolean isFull()
-    {
-        return mPointer >= mMaxSize;
-    }
-
-    /**
-     * Indicates if this buffer is empty
-     */
-    public boolean isEmpty()
-    {
-        return mPointer == 0;
-    }
-
-    /**
-     * Adds the channel results to this buffer
-     * @param channelResults to add
-     * @throws IllegalArgumentException if the buffer is full or if the size of the channel results array is a different
-     * length than any of the preceeding channel results that were added to this buffer
-     */
-    public void add(float[] channelResults) throws IllegalArgumentException
-    {
-        if(mPointer >= mMaxSize)
-        {
-            throw new IllegalArgumentException("Buffer is full - cannot add new channel results");
-        }
-
-        if(mPointer == 0)
-        {
-            mChannelResults = new float[mMaxSize][channelResults.length];
-        }
-        else
-        {
-            int currentLength = mChannelResults[0].length;
-
-            if(channelResults.length != currentLength)
-            {
-                throw new IllegalArgumentException("Channel results length [" + channelResults.length + "] cannot be " +
-                    "a different length than the channel results that are already contained in this buffer [" +
-                    currentLength + "]");
-            }
-        }
-
-        mChannelResults[mPointer++] = channelResults;
-    }
-
-    /**
-     * Channel results array contained in this buffer
-     */
-    public float[][] getChannelResults()
-    {
-        //If this buffer is full, return all of the channel results
-        if(mPointer == mMaxSize)
-        {
-            return mChannelResults;
-        }
-        //Otherwise, truncate the results to return
-        else
-        {
-            return Arrays.copyOf(mChannelResults, mPointer);
-        }
-    }
-
-    /**
-     * Extracts a single I/Q interleaved sample buffer from the channel results
-     * @param iChannelIndex to extract for the inphase sample.  The q index is assumed to be one greater than i.
-     * @return float[] containing interleaved I and Q samples
-     * @throws IllegalArgumentException if this buffer doesn't contain any samples or if the requested channel is
-     * not within the channel range of the contained channel results.
-     */
-    public float[] getChannel(int iChannelIndex)
-    {
-        if(isEmpty())
-        {
-            throw new IllegalArgumentException("Buffer is empty - cannot extract channel [" + iChannelIndex + "]");
-        }
-
-        if(!isValidChannelIndex(iChannelIndex))
-        {
-            throw new IllegalArgumentException("Channel [" + iChannelIndex + "] is not valid for the contained channel " +
-                "results -- max channel is " + getMaxChannelIndex());
-        }
-
-        float[] samples = new float[mChannelResults.length * 2];
-        int pointer = 0;
-
-        int qChannelIndex = iChannelIndex + 1;
-
-        for(int x = 0; x < mPointer; x++)
-        {
-            float[] channelResults = mChannelResults[x];
-
-            samples[pointer++] = channelResults[iChannelIndex];
-            samples[pointer++] = channelResults[qChannelIndex];
-        }
-
-        return samples;
-    }
-
-    /**
-     * Indicates if the channel argument is valid for the contained channel results.
-     * @param channelIndex number (0 to N) to check
-     * @return false if the buffer is empty or if the channel is greater than the contained channel results
-     */
-    private boolean isValidChannelIndex(int channelIndex)
-    {
-        return channelIndex <= getMaxChannelIndex();
-    }
-
-    /**
-     * Maximum channel index represented in the channel results contained in this buffer.
-     * @return max channel number, or 0 if the buffer is empty
-     */
-    private int getMaxChannelIndex()
-    {
-        if(isEmpty())
-        {
-            return 0;
-        }
-
-        return mChannelResults[0].length;
-    }
-}

src/main/java/io/github/dsheirer/dsp/filter/channelizer/PolyphaseChannelSource.java

@@ -16,22 +16,35 @@
 package io.github.dsheirer.dsp.filter.channelizer;
 
 import io.github.dsheirer.dsp.filter.channelizer.output.IPolyphaseChannelOutputProcessor;
+import io.github.dsheirer.dsp.filter.design.FilterDesignException;
+import io.github.dsheirer.dsp.filter.fir.FIRFilterSpecification;
+import io.github.dsheirer.dsp.filter.fir.complex.ComplexFIRFilter2;
+import io.github.dsheirer.dsp.filter.fir.remez.RemezFIRFilterDesigner;
 import io.github.dsheirer.sample.Listener;
 import io.github.dsheirer.sample.buffer.ReusableChannelResultsBuffer;
 import io.github.dsheirer.sample.buffer.ReusableComplexBuffer;
 import io.github.dsheirer.sample.buffer.ReusableComplexBufferAssembler;
 import io.github.dsheirer.source.SourceEvent;
+import io.github.dsheirer.source.tuner.channel.ChannelSpecification;
 import io.github.dsheirer.source.tuner.channel.TunerChannel;
 import io.github.dsheirer.source.tuner.channel.TunerChannelSource;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.util.HashMap;
+import java.util.Map;
+
 public class PolyphaseChannelSource extends TunerChannelSource
 {
     private final static Logger mLog = LoggerFactory.getLogger(PolyphaseChannelSource.class);
 
     private ReusableComplexBufferAssembler mReusableComplexBufferAssembler;
     private IPolyphaseChannelOutputProcessor mPolyphaseChannelOutputProcessor;
+    private IPolyphaseChannelOutputProcessor mReplacementPolyphaseChannelOutputProcessor;
+    private long mReplacementFrequency;
+    private ComplexFIRFilter2 mLowPassFilter;
+    private static Map<Integer,float[]> sLowPassFilters = new HashMap();
+
     private double mChannelSampleRate;
     private long mIndexCenterFrequency;
     private long mChannelFrequencyCorrection;
@@ -46,15 +59,22 @@ public class PolyphaseChannelSource extends TunerChannelSource
      * @param producerSourceEventListener to receive source event requests (e.g. start/stop sample stream)
      * @param channelSampleRate for the downstream sample output
      * @param centerFrequency of the incoming polyphase channel(s)
+     * @throws FilterDesignException if a channel low pass filter can't be designed to the channel specification
      */
     public PolyphaseChannelSource(TunerChannel tunerChannel, IPolyphaseChannelOutputProcessor outputProcessor,
                                   Listener<SourceEvent> producerSourceEventListener, double channelSampleRate,
-                                  long centerFrequency)
+                                  long centerFrequency, ChannelSpecification channelSpecification)
+        throws FilterDesignException
     {
         super(producerSourceEventListener, tunerChannel);
         mPolyphaseChannelOutputProcessor = outputProcessor;
         mChannelSampleRate = channelSampleRate;
         mReusableComplexBufferAssembler = new ReusableComplexBufferAssembler(2500, mChannelSampleRate);
+
+        float[] filterCoefficients = getLowPassFilter(channelSampleRate, channelSpecification.getPassFrequency(),
+            channelSpecification.getStopFrequency());
+        mLowPassFilter = new ComplexFIRFilter2(filterCoefficients, 1.0f);
+
         setFrequency(centerFrequency);
     }
 
@@ -93,14 +113,33 @@ public class PolyphaseChannelSource extends TunerChannelSource
      */
     public void setPolyphaseChannelOutputProcessor(IPolyphaseChannelOutputProcessor outputProcessor, long frequency)
     {
-        //Lock on the channel output processor to block the channel results processor thread from servicing the
-        //channel output processor's buffer while we change out the processors.
-        synchronized(mPolyphaseChannelOutputProcessor)
+        //If this is the first time, simply assign the output processor
+        if(mPolyphaseChannelOutputProcessor == null)
+        {
+            mPolyphaseChannelOutputProcessor = outputProcessor;
+        }
+        //Otherwise, we have to swap out the processor on the sample processing thread
+        else
+        {
+            mReplacementPolyphaseChannelOutputProcessor = outputProcessor;
+            mReplacementFrequency = frequency;
+        }
+    }
+
+    /**
+     * Updates the output processor to use the new output processor provided by the external
+     * polyphase channel manager.  This method should only be executed on the sample processing
+     * thread, within the processChannelResults() method.
+     */
+    private void swapOutputProcessor()
+    {
+        if(mReplacementPolyphaseChannelOutputProcessor != null)
         {
             IPolyphaseChannelOutputProcessor existingProcessor = mPolyphaseChannelOutputProcessor;
 
             //Swap out the processor so that incoming samples can accumulate in the new channel output processor
-            mPolyphaseChannelOutputProcessor = outputProcessor;
+            mPolyphaseChannelOutputProcessor = mReplacementPolyphaseChannelOutputProcessor;
+            mReplacementPolyphaseChannelOutputProcessor = null;
 
             //Remove the buffer overflow listener and clear any previous buffer overflow state
             existingProcessor.setSourceOverflowListener(null);
@@ -109,18 +148,9 @@ public class PolyphaseChannelSource extends TunerChannelSource
             //Register to receive buffer overflow notifications so we can push them up through the source chain
             mPolyphaseChannelOutputProcessor.setSourceOverflowListener(this);
 
-            //Fully process the residual channel results buffer of the previous channel output processor
-            if(existingProcessor != null)
-            {
-                existingProcessor.processChannelResults(mReusableComplexBufferAssembler);
-            }
-
-            //Finally, setup the frequency offset for the output processor and reset the frequency correction value
-            //to allow consumers to adjust and calculate a new frequency correction value, if needed.
-            mIndexCenterFrequency = frequency;
-            mChannelFrequencyCorrection = 0;
+            //Finally, setup the frequency offset for the output processor.
+            mIndexCenterFrequency = mReplacementFrequency;
             mPolyphaseChannelOutputProcessor.setFrequencyOffset(getFrequencyOffset());
-            broadcastConsumerSourceEvent(SourceEvent.frequencyCorrectionChange(mChannelFrequencyCorrection));
         }
     }
 
@@ -133,6 +163,11 @@ public class PolyphaseChannelSource extends TunerChannelSource
      */
     public void receiveChannelResults(ReusableChannelResultsBuffer channelResultsBuffer)
     {
+        if(mReplacementPolyphaseChannelOutputProcessor != null)
+        {
+            swapOutputProcessor();
+        }
+
         mReusableComplexBufferAssembler.updateTimestamp(channelResultsBuffer.getTimestamp());
         mPolyphaseChannelOutputProcessor.receiveChannelResults(channelResultsBuffer);
     }
@@ -169,7 +204,6 @@ public class PolyphaseChannelSource extends TunerChannelSource
         if(mPolyphaseChannelOutputProcessor != null)
         {
             mPolyphaseChannelOutputProcessor.dispose();
-            mPolyphaseChannelOutputProcessor = null;
         }
     }
 
@@ -197,7 +231,7 @@ public class PolyphaseChannelSource extends TunerChannelSource
      * @param frequency in hertz
      */
     @Override
-    protected void setFrequency(long frequency)
+    public void setFrequency(long frequency)
     {
         mIndexCenterFrequency = frequency;
 
@@ -209,11 +243,7 @@ public class PolyphaseChannelSource extends TunerChannelSource
     @Override
     protected void processSamples()
     {
-        //Lock on the output processor so that it can't be changed in the middle of processing
-        synchronized(mPolyphaseChannelOutputProcessor)
-        {
-            mPolyphaseChannelOutputProcessor.processChannelResults(mReusableComplexBufferAssembler);
-        }
+        mPolyphaseChannelOutputProcessor.processChannelResults(mReusableComplexBufferAssembler);
     }
 
     /**
@@ -232,9 +262,51 @@ public class PolyphaseChannelSource extends TunerChannelSource
      */
     private void updateFrequencyOffset()
     {
-        synchronized(mPolyphaseChannelOutputProcessor)
+        mPolyphaseChannelOutputProcessor.setFrequencyOffset(getFrequencyOffset());
+    }
+
+    @Override
+    public String toString()
+    {
+        return "POLYPHASE [" + mPolyphaseChannelOutputProcessor.getInputChannelCount() + "] " +
+            getTunerChannel().getFrequency();
+    }
+
+    /**
+     * Creates a low-pass filter to use as the final cleanup filter for the decimated output stream
+     *
+     * @param sampleRate for the final output channel rate
+     * @param passFrequency for half of the desired channel rate
+     * @param stopFrequency for the attenuated band
+     * @return a newly designed filter or a previously designed (cached) filter
+     * @throws FilterDesignException
+     */
+    private float[] getLowPassFilter(double sampleRate, double passFrequency, double stopFrequency) throws FilterDesignException
+    {
+        //Use existing filter if we've already designed one
+        if(sLowPassFilters.containsKey((int)sampleRate))
         {
-            mPolyphaseChannelOutputProcessor.setFrequencyOffset(getFrequencyOffset());
+            return sLowPassFilters.get((int)sampleRate);
         }
+
+        FIRFilterSpecification specification = FIRFilterSpecification.lowPassBuilder()
+            .sampleRate(sampleRate)
+            .gridDensity(16)
+            .passBandCutoff(passFrequency)
+            .passBandAmplitude(1.0)
+            .passBandRipple(0.01)
+            .stopBandStart(stopFrequency)
+            .stopBandAmplitude(0.0)
+            .stopBandRipple(0.01)
+            .build();
+
+        RemezFIRFilterDesigner designer = new RemezFIRFilterDesigner(specification);
+
+        //This will throw an exception if the filter cannot be designed
+        float[] taps = designer.getImpulseResponse();
+
+        sLowPassFilters.put((int)sampleRate, taps);
+
+        return taps;
     }
 }

src/main/java/io/github/dsheirer/dsp/filter/channelizer/output/ChannelOutputProcessor.java

@@ -42,6 +42,7 @@ public abstract class ChannelOutputProcessor implements IPolyphaseChannelOutputP
     private int mInputChannelCount;
     private IOscillator mFrequencyCorrectionMixer;
     private boolean mFrequencyCorrectionEnabled;
+    private double mGain = 1.0;
 
     /**
      * Base class for polyphase channelizer output channel processing.  Provides built-in frequency translation
@@ -51,9 +52,10 @@ public abstract class ChannelOutputProcessor implements IPolyphaseChannelOutputP
      * @param sampleRate of the output channel.  This is used to match the oscillator's sample rate to the output
      * channel sample rate for frequency translation/correction.
      */
-    public ChannelOutputProcessor(int inputChannelCount, double sampleRate)
+    public ChannelOutputProcessor(int inputChannelCount, double sampleRate, double gain)
     {
         mInputChannelCount = inputChannelCount;
+        mGain = gain;
 
 //TODO: swap this out and use the LowPhaseNoiseOscillator
         mFrequencyCorrectionMixer = new Oscillator(0, sampleRate);
@@ -62,6 +64,17 @@ public abstract class ChannelOutputProcessor implements IPolyphaseChannelOutputP
         mChannelResultsQueue = new OverflowableReusableBufferTransferQueue<>((int)(sampleRate * 3), (int)(sampleRate * 0.5));
     }
 
+    protected double getGain()
+    {
+        return mGain;
+    }
+
+    @Override
+    public int getPolyphaseChannelIndexCount()
+    {
+        return mInputChannelCount;
+    }
+
     public void dispose()
     {
         if(mChannelResultsQueue != null)

src/main/java/io/github/dsheirer/dsp/filter/channelizer/output/IPolyphaseChannelOutputProcessor.java

@@ -59,6 +59,11 @@ public interface IPolyphaseChannelOutputProcessor
      */
     void setPolyphaseChannelIndices(List<Integer> indexes);
 
+    /**
+     * List of current polyphase channel indices for the output processor
+     */
+    int getPolyphaseChannelIndexCount();
+
     /**
      * Updates the synthesis filter taps for this output processor
      * @param filter

src/main/java/io/github/dsheirer/dsp/filter/channelizer/output/OneChannelOutputProcessor.java

@@ -38,10 +38,11 @@ public class OneChannelOutputProcessor extends ChannelOutputProcessor
      *
      * @param sampleRate of the output sample stream.
      * @param channelIndexes containing a single channel index.
+     * @param gain value to apply.  Typically this is the same as the channelizer's channel count.
      */
-    public OneChannelOutputProcessor(double sampleRate, List<Integer> channelIndexes)
+    public OneChannelOutputProcessor(double sampleRate, List<Integer> channelIndexes, double gain)
     {
-        super(1, sampleRate);
+        super(1, sampleRate, gain);
         setPolyphaseChannelIndices(channelIndexes);
     }
 
@@ -91,6 +92,8 @@ public class OneChannelOutputProcessor extends ChannelOutputProcessor
                     getFrequencyCorrectionMixer().mixComplex(channelBuffer.getSamples());
                 }
 
+                channelBuffer.applyGain(getGain());
+
                 reusableComplexBufferAssembler.receive(channelBuffer);
             }
             catch(IllegalArgumentException iae)

src/main/java/io/github/dsheirer/dsp/filter/channelizer/output/TwoChannelOutputProcessor.java

@@ -16,29 +16,18 @@
 package io.github.dsheirer.dsp.filter.channelizer.output;
 
 import io.github.dsheirer.dsp.filter.channelizer.TwoChannelSynthesizerM2;
-import io.github.dsheirer.dsp.filter.design.FilterDesignException;
-import io.github.dsheirer.dsp.filter.fir.FIRFilterSpecification;
-import io.github.dsheirer.dsp.filter.fir.complex.ComplexFIRFilter2;
-import io.github.dsheirer.dsp.filter.fir.remez.RemezFIRFilterDesigner;
 import io.github.dsheirer.dsp.mixer.FS4DownConverter;
 import io.github.dsheirer.sample.buffer.ReusableChannelResultsBuffer;
 import io.github.dsheirer.sample.buffer.ReusableComplexBuffer;
 import io.github.dsheirer.sample.buffer.ReusableComplexBufferAssembler;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
-import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
 
 public class TwoChannelOutputProcessor extends ChannelOutputProcessor
 {
-    private final static Logger mLog = LoggerFactory.getLogger(TwoChannelOutputProcessor.class);
-
-    private static Map<Integer,float[]> sLowPassFilterKernelMap = new HashMap<>();
+//    private final static Logger mLog = LoggerFactory.getLogger(TwoChannelOutputProcessor.class);
     private TwoChannelSynthesizerM2 mSynthesizer;
     private FS4DownConverter mFS4DownConverter = new FS4DownConverter();
-    private ComplexFIRFilter2 mLowPassFilter;
 
     private int mChannelOffset1;
     private int mChannelOffset2;
@@ -49,36 +38,20 @@ public class TwoChannelOutputProcessor extends ChannelOutputProcessor
      *
      * @param sampleRate of the output sample stream.
      * @param channelIndexes containing two channel indices.
+     * @param gain to apply to output.  Typically this is equal to the channelizer's channel count.
      */
-    public TwoChannelOutputProcessor(double sampleRate, List<Integer> channelIndexes, float[] filter)
+    public TwoChannelOutputProcessor(double sampleRate, List<Integer> channelIndexes, float[] filter, double gain)
     {
         //Set the frequency correction oscillator to 2 x output sample rate since we'll be correcting the frequency
         //after synthesizing both input channels
-        super(2, sampleRate);
+        super(2, sampleRate, gain);
         setPolyphaseChannelIndices(channelIndexes);
         setSynthesisFilter(filter);
-
-        float[] lowPassFilter = sLowPassFilterKernelMap.get((int)sampleRate);
-
-        if(lowPassFilter == null)
-        {
-            try
-            {
-                lowPassFilter = getLowPassFilter(sampleRate);
-                sLowPassFilterKernelMap.put((int)sampleRate, lowPassFilter);
-            }
-            catch(FilterDesignException fde)
-            {
-                mLog.error("Couldn't design a low-pass filter for 2-channel synthesizer", fde);
-                throw new IllegalStateException("Cannot design low-pass filter for 2 channel synthesizer", fde);
-            }
-        }
-
-        mLowPassFilter = new ComplexFIRFilter2(lowPassFilter, 1.0f);
     }
 
     /**
      * Sets the frequency offset to apply to the incoming samples to mix the desired signal to baseband.
+     *
      * @param frequencyOffset in hertz
      */
     @Override
@@ -125,7 +98,7 @@ public class TwoChannelOutputProcessor extends ChannelOutputProcessor
     public void process(List<ReusableChannelResultsBuffer> channelResultsBuffers,
                         ReusableComplexBufferAssembler reusableComplexBufferAssembler)
     {
-        for(ReusableChannelResultsBuffer buffer: channelResultsBuffers)
+        for(ReusableChannelResultsBuffer buffer : channelResultsBuffers)
         {
             ReusableComplexBuffer channel1 = buffer.getChannel(mChannelOffset1);
             ReusableComplexBuffer channel2 = buffer.getChannel(mChannelOffset2);
@@ -139,46 +112,11 @@ public class TwoChannelOutputProcessor extends ChannelOutputProcessor
             //Apply offset and frequency correction to center the signal of interest within the synthesized channel
             getFrequencyCorrectionMixer().mixComplex(synthesized.getSamples());
 
-            ReusableComplexBuffer lowPassFiltered = mLowPassFilter.filter(synthesized);
+            synthesized.applyGain(getGain());
 
-            reusableComplexBufferAssembler.receive(lowPassFiltered);
+            reusableComplexBufferAssembler.receive(synthesized);
 
             buffer.decrementUserCount();
         }
     }
-
-    /**
-     * Creates a low-pass filter kernel for the specified sample rate.
-     * @param sampleRate for the channel
-     * @return filter
-     * @throws FilterDesignException if the filter cannot be designed
-     */
-    private static float[] getLowPassFilter(double sampleRate) throws FilterDesignException
-    {
-        double cutoff = sampleRate / 4.0;
-        int passBandCutoff = (int)(cutoff * 0.92);
-        int stopBandStart = (int)(cutoff * 1.08);
-
-        FIRFilterSpecification specification = FIRFilterSpecification.lowPassBuilder()
-            .sampleRate(sampleRate)
-            .gridDensity(16)
-            .oddLength(true)
-            .passBandCutoff((int)passBandCutoff)
-            .passBandAmplitude(1.0)
-            .passBandRipple(0.01)
-            .stopBandStart((int)stopBandStart)
-            .stopBandAmplitude(0.0)
-            .stopBandRipple(0.005) //Approximately 94 dB attenuation
-            .build();
-
-        RemezFIRFilterDesigner designer = new RemezFIRFilterDesigner(specification);
-
-        if(designer.isValid())
-        {
-            return designer.getImpulseResponse();
-        }
-
-        throw new FilterDesignException("Couldn't design low-pass filter for sample rate: " + sampleRate +
-            " Pass End:" + passBandCutoff + " Stop Begin:" + stopBandStart);
-    }
 }

src/main/java/io/github/dsheirer/dsp/filter/cic/ComplexPrimeCICDecimate.java

@@ -15,11 +15,10 @@
  ******************************************************************************/
 package io.github.dsheirer.dsp.filter.cic;
 
-import io.github.dsheirer.dsp.filter.FilterFactory;
-import io.github.dsheirer.dsp.filter.Filters;
-import io.github.dsheirer.dsp.filter.Window;
+import io.github.dsheirer.dsp.filter.design.FilterDesignException;
+import io.github.dsheirer.dsp.filter.fir.FIRFilterSpecification;
 import io.github.dsheirer.dsp.filter.fir.complex.ComplexFIRFilter2;
-import io.github.dsheirer.dsp.filter.halfband.complex.ComplexHalfBandFilter;
+import io.github.dsheirer.dsp.filter.fir.remez.RemezFIRFilterDesigner;
 import io.github.dsheirer.sample.Listener;
 import io.github.dsheirer.sample.buffer.ReusableComplexBuffer;
 import io.github.dsheirer.sample.buffer.ReusableComplexBufferAssembler;
@@ -28,52 +27,93 @@ import io.github.dsheirer.sample.decimator.ComplexDecimator;
 import org.apache.commons.lang3.Validate;
 
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
+/**
+ * Non-Recursive Prime-Factor CIC Filter.
+ *
+ * Implements the CIC filter described in Understanding Digital Signal Processing, 3e, Lyons, on page 769.  This
+ * filter is comprised of multiple decimating stages each with a prime factor decimation rate.  Multiple stages are
+ * cascaded to achieve the overall decimation rate.
+ *
+ * This filter currently supports a maximum decimation rate of 2801.  Higher decimation rates can be added by
+ * adding additional prime factors to the PRIMES array.
+ */
 public class ComplexPrimeCICDecimate implements Listener<ReusableComplexBuffer>
 {
+//    private final static Logger mLog = LoggerFactory.getLogger(ComplexPrimeCICDecimate.class);
+
+    /**
+     * PRIME numbers to use for decimation stage sizing.  This list contains values that should
+     * support input sample rates up to 70 MHz with an output channel rate of at least 25 kHz.
+     */
     public static int[] PRIMES = {2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53,
         59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151,
         157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251,
         257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359,
         367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463,
         467, 479, 487, 491, 499, 503, 509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593,
-        599, 601, 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691};
+        599, 601, 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701,
+        709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811, 821, 823, 827,
+        829, 839, 853, 857, 859, 863, 877, 881, 883, 887, 907, 911, 919, 929, 937, 941, 947, 953,
+        967, 971, 977, 983, 991, 997, 997, 1009, 1013, 1019, 1021, 1031, 1033, 1039, 1049, 1051,
+        1061, 1063, 1069, 1087, 1091, 1093, 1097, 1103, 1109, 1117, 1123, 1129, 1151, 1153, 1163,
+        1171, 1181, 1187, 1193, 1201, 1213, 1217, 1223, 1229, 1231, 1237, 1249, 1259, 1277, 1279,
+        1283, 1289, 1291, 1297, 1301, 1303, 1307, 1319, 1321, 1327, 1361, 1367, 1373, 1381, 1399,
+        1409, 1423, 1427, 1429, 1433, 1439, 1447, 1451, 1453, 1459, 1471, 1481, 1483, 1487, 1489,
+        1493, 1499, 1511, 1523, 1531, 1543, 1549, 1553, 1559, 1567, 1571, 1579, 1583, 1597, 1601,
+        1607, 1609, 1613, 1619, 1621, 1627, 1637, 1657, 1663, 1667, 1669, 1693, 1697, 1699, 1709,
+        1721, 1723, 1733, 1741, 1747, 1753, 1759, 1777, 1783, 1787, 1789, 1801, 1811, 1823, 1831,
+        1847, 1861, 1867, 1871, 1873, 1877, 1879, 1889, 1901, 1907, 1913, 1931, 1933, 1949, 1951,
+        1973, 1979, 1987, 1993, 1997, 1999, 2003, 2011, 2017, 2027, 2029, 2039, 2053, 2063, 2069,
+        2081, 2083, 2087, 2089, 2099, 2111, 2113, 2129, 2131, 2137, 2141, 2143, 2153, 2161, 2179,
+        2203, 2207, 2213, 2221, 2237, 2239, 2243, 2251, 2267, 2269, 2273, 2281, 2287, 2293, 2297,
+        2309, 2311, 2333, 2339, 2341, 2347, 2351, 2357, 2371, 2377, 2381, 2383, 2389, 2393, 2399,
+        2411, 2417, 2423, 2437, 2441, 2447, 2459, 2467, 2473, 2477, 2503, 2521, 2531, 2539, 2543,
+        2549, 2551, 2557, 2579, 2591, 2593, 2609, 2617, 2621, 2633, 2647, 2657, 2659, 2663, 2671,
+        2677, 2683, 2687, 2689, 2693, 2699, 2707, 2711, 2713, 2719, 2729, 2731, 2741, 2749, 2753,
+        2767, 2777, 2789, 2791, 2797, 2801
+    };
 
-    private ArrayList<DecimatingStage> mDecimatingStages =
-        new ArrayList<DecimatingStage>();
+    private static Map<Integer,float[]> sLowPassFilters = new HashMap();
+    private static Map<Integer,List<Integer>> sPrimeFactors = new HashMap();
 
+    private List<DecimatingStage> mDecimatingStages = new ArrayList<DecimatingStage>();
     private DecimatingStage mFirstDecimatingStage;
-
     private Output mOutput;
 
     /**
-     * Non-Recursive Prime-Factor CIC Filter with float sample array inputs and
-     * decimated, single paired i/q float sample output.
+     * Constructs a new decimation filter.
      *
-     * Implements the CIC filter described in Understanding Digital Signal
-     * Processing, 3e, Lyons, on page 769.  This filter is comprised of multiple
-     * decimating stages each with a prime factor decimation rate.  Multiple
-     * stages are cascaded to achieve the overall decimation rate.
+     * An example setup for a 2.4 MHz input sample rate and 25 kHz output channel rate with a desired 12.5 kHz channel
+     * pass band might be:
+     * sampleRate = 2,400,000.0
+     * decimation = 96
+     * passFrequency = 6250 (1/4 of the channel rate)
+     * stopFrequency = 7000
      *
-     * This filter supports a maximum decimation rate of 700.  This filter can
-     * be adapted to higher decimation rates by adding additional prime factors
-     * to the PRIMES array.
+     * Note: the transition bandwidth (stop - start) directly impacts the size of the low-pass cleanup filter,
+     * where smaller transition bandwidth creates a longer filter that requires more processing effort.
      *
+     * @param sampleRate of the input sample stream
      * @param decimation - overall decimation rate
-     * @param order - filter order
+     * @param passFrequency for the final cleanup filter
+     * @param stopFrequency for the final cleanup filter
+     * @throws FilterDesignException if a final low-pass cleanup filter cannot be created for the output channel rate
+     *                               and specified pass/stop frequencies.
      */
-    public ComplexPrimeCICDecimate(int decimation, int order,
-                                   int passFrequency, int attenuation, Window.WindowType windowType)
+    public ComplexPrimeCICDecimate(double sampleRate, int decimation, double passFrequency, double stopFrequency)
+        throws FilterDesignException
     {
-        Validate.isTrue(decimation <= 700);
-
+        Validate.isTrue(decimation <= PRIMES[PRIMES.length - 1]);
 
         List<Integer> stageSizes = getPrimeFactors(decimation);
 
         for(int x = 0; x < stageSizes.size(); x++)
         {
-            DecimatingStage stage = new DecimatingStage(stageSizes.get(x), order);
+            DecimatingStage stage = new DecimatingStage(stageSizes.get(x), 1);
 
             mDecimatingStages.add(stage);
 
@@ -89,10 +129,11 @@ public class ComplexPrimeCICDecimate implements Listener<ReusableComplexBuffer>
             }
         }
 
-        mOutput = new Output(48000, passFrequency, attenuation, windowType);
+        double channelRate = sampleRate / (double)decimation;
 
-        mDecimatingStages.get(mDecimatingStages.size() - 1)
-            .setListener(mOutput);
+        mOutput = new Output(channelRate, passFrequency, stopFrequency);
+
+        mDecimatingStages.get(mDecimatingStages.size() - 1).setListener(mOutput);
     }
 
     public void dispose()
@@ -127,16 +168,26 @@ public class ComplexPrimeCICDecimate implements Listener<ReusableComplexBuffer>
     }
 
     /**
-     * Calculates the prime factors of the decimation rate up to a maximum
-     * decimation rate of 700.  If you wish to have decimation rates higher
-     * than 700, then add additional prime factors to the PRIMES array.
+     * Calculates the prime factors of the decimation rate.  If you wish to have decimation rates higher than the
+     * highest rate listed in the PRIMES array, then add additional prime factors to the PRIMES array.
      *
      * @param decimation - integral decimation rate
      * @return - ordered list (smallest to largest) of prime factors
      */
     public static List<Integer> getPrimeFactors(int decimation)
     {
-        ArrayList<Integer> stages = new ArrayList<Integer>();
+        if(decimation > PRIMES[PRIMES.length - 1])
+        {
+            throw new IllegalArgumentException("Decimation rates higher than [" + PRIMES[PRIMES.length - 1] +
+                "] are not supported.  Update the PRIMES array to add support for higher decimation rates");
+        }
+
+        if(sPrimeFactors.containsKey(decimation))
+        {
+            return sPrimeFactors.get(decimation);
+        }
+
+        List<Integer> primeFactors = new ArrayList<Integer>();
 
         int pointer = 0;
 
@@ -146,8 +197,7 @@ public class ComplexPrimeCICDecimate implements Listener<ReusableComplexBuffer>
 
             if(decimation % prime == 0)
             {
-                stages.add(prime);
-
+                primeFactors.add(prime);
                 decimation /= prime;
             }
             else
@@ -156,7 +206,9 @@ public class ComplexPrimeCICDecimate implements Listener<ReusableComplexBuffer>
             }
         }
 
-        return stages;
+        sPrimeFactors.put(decimation, primeFactors);
+
+        return primeFactors;
     }
 
     /**
@@ -185,7 +237,7 @@ public class ComplexPrimeCICDecimate implements Listener<ReusableComplexBuffer>
      */
     public class DecimatingStage implements ComplexSampleListener
     {
-        private ArrayList<Stage> mStages = new ArrayList<Stage>();
+        private List<Stage> mStages = new ArrayList<Stage>();
         private Stage mFirstStage;
         private ComplexDecimator mDecimator;
 
@@ -217,7 +269,6 @@ public class ComplexPrimeCICDecimate implements Listener<ReusableComplexBuffer>
             }
 
             mDecimator = new ComplexDecimator(size);
-
             mStages.get(mStages.size() - 1).setListener(mDecimator);
         }
 
@@ -248,9 +299,8 @@ public class ComplexPrimeCICDecimate implements Listener<ReusableComplexBuffer>
     }
 
     /**
-     * Single non-decimating CIC stage component.  Uses a circular buffer and a
-     * running average internally to implement the stage so that stage size has
-     * essentially no impact on the computational requirements of the stage
+     * Single non-decimating CIC stage component.  Uses a circular buffer and a running average internally to implement
+     * the stage so that stage size has essentially no impact on the computational requirements of the stage
      */
     public class Stage implements ComplexSampleListener
     {
@@ -267,7 +317,7 @@ public class ComplexPrimeCICDecimate implements Listener<ReusableComplexBuffer>
 
         protected float mGain;
 
-        public Stage()
+        protected Stage()
         {
         }
 
@@ -278,7 +328,8 @@ public class ComplexPrimeCICDecimate implements Listener<ReusableComplexBuffer>
             mISamples = new float[mSize];
             mQSamples = new float[mSize];
 
-            mGain = 1.0f / (float)size;
+            float baseGain = 1.0f / (float)size;
+            mGain = baseGain * (1.0f / (1.0f - baseGain));
         }
 
         public void dispose()
@@ -288,7 +339,7 @@ public class ComplexPrimeCICDecimate implements Listener<ReusableComplexBuffer>
 
         public void receive(float i, float q)
         {
-            /* Subtract the oldest sample and add back in the newest */
+            /* Subtract the oldest sample and add in the newest sample */
             mISum = mISum - mISamples[mSamplePointer] + i;
             mQSum = mQSum - mQSamples[mSamplePointer] + q;
 
@@ -316,30 +367,24 @@ public class ComplexPrimeCICDecimate implements Listener<ReusableComplexBuffer>
     }
 
     /**
-     * Size 2 stage that removes the unnecessary circular buffer management for
-     * a two-stage.
+     * Size 2 stage that eliminates the unnecessary circular buffer management for a two-stage.
      */
     public class TwoStage extends Stage
     {
         public TwoStage()
         {
-            super();
-
             mGain = 0.5f;
         }
 
         public void receive(float i, float q)
         {
-            float iSum = mISum + i;
-            float qSum = mQSum + q;
+            if(mListener != null)
+            {
+                mListener.receive(((mISum + i) * mGain), ((mQSum + q) * mGain));
+            }
 
             mISum = i;
             mQSum = q;
-
-            if(mListener != null)
-            {
-                mListener.receive((iSum * mGain), (qSum * mGain));
-            }
         }
     }
 
@@ -350,31 +395,29 @@ public class ComplexPrimeCICDecimate implements Listener<ReusableComplexBuffer>
      */
     public class Output implements ComplexSampleListener
     {
-        /* Decimated output buffers will contain 1024 samples */
-        private ReusableComplexBufferAssembler mAssembler = new ReusableComplexBufferAssembler(2048, 48000.0);
-
-        private ComplexFIRFilter2 mCleanupFilter;
-        private ComplexHalfBandFilter mHalfBandFilter = new ComplexHalfBandFilter(
-            Filters.FIR_HALF_BAND_31T_ONE_EIGHTH_FCO.getCoefficients(), 0.4f, false);
+        /* Decimated output buffers will contain 1024 complex samples */
+        private ReusableComplexBufferAssembler mBufferAssembler;
+        private ComplexFIRFilter2 mLowPassFilter;
         private Listener<ReusableComplexBuffer> mReusableComplexBufferListener;
 
-        public Output(int outputSampleRate, int passFrequency, int attenuation,
-                      Window.WindowType windowType)
+        public Output(double outputSampleRate, double passFrequency, double stopFrequency) throws FilterDesignException
         {
-            mCleanupFilter = new ComplexFIRFilter2(FilterFactory
-                .getCICCleanupFilter(outputSampleRate, passFrequency, attenuation, windowType), 0.4f);
+            mBufferAssembler = new ReusableComplexBufferAssembler(2400, outputSampleRate);
 
-            //Bypassing the CIC cleanup filter for now
-            mAssembler.setListener(new Listener<ReusableComplexBuffer>()
+            //This may throw an exception if we can't design a filter for the sample rate and pass/stop frequencies
+            float[] filterCoefficients = getLowPassFilter(outputSampleRate, passFrequency, stopFrequency);
+            mLowPassFilter = new ComplexFIRFilter2(filterCoefficients, 1.0f);
+
+            mBufferAssembler.setListener(new Listener<ReusableComplexBuffer>()
             {
                 @Override
                 public void receive(ReusableComplexBuffer reusableComplexBuffer)
                 {
                     if(mReusableComplexBufferListener != null)
                     {
-                        ReusableComplexBuffer cleanupFiltered = mCleanupFilter.filter(reusableComplexBuffer);
-                        ReusableComplexBuffer halfBandFiltered = mHalfBandFilter.filter(cleanupFiltered);
-                        mReusableComplexBufferListener.receive(halfBandFiltered);
+                        ReusableComplexBuffer filteredBuffer = mLowPassFilter.filter(reusableComplexBuffer);
+                        mReusableComplexBufferListener.receive(filteredBuffer);
+//                        mReusableComplexBufferListener.receive(reusableComplexBuffer);
                     }
                     else
                     {
@@ -386,20 +429,17 @@ public class ComplexPrimeCICDecimate implements Listener<ReusableComplexBuffer>
 
         public void dispose()
         {
-            mAssembler.dispose();
-            mCleanupFilter.dispose();
-            mHalfBandFilter.dispose();
+            mBufferAssembler.dispose();
+            mLowPassFilter.dispose();
         }
 
         /**
-         * Receiver method for the output adapter to receive a filtered,
-         * decimated sample, apply gain correction, apply cleanup filtering
-         * and output the sample values as a complex sample.
+         * Interface for receiving CIC decimated output samples
          */
         @Override
         public void receive(float inphase, float quadrature)
         {
-            mAssembler.receive(new float[]{inphase, quadrature});
+            mBufferAssembler.receive(inphase, quadrature);
         }
 
         public void setListener(Listener<ReusableComplexBuffer> listener)
@@ -411,5 +451,43 @@ public class ComplexPrimeCICDecimate implements Listener<ReusableComplexBuffer>
         {
             mReusableComplexBufferListener = null;
         }
+
+        /**
+         * Creates a low-pass filter to use as the final cleanup filter for the decimated output stream
+         *
+         * @param sampleRate for the final output channel rate
+         * @param passFrequency for half of the desired channel rate
+         * @param stopFrequency for the attenuated band
+         * @return a newly designed filter or a previously designed (cached) filter
+         * @throws FilterDesignException
+         */
+        private float[] getLowPassFilter(double sampleRate, double passFrequency, double stopFrequency) throws FilterDesignException
+        {
+            //Use existing filter if we've already designed one
+            if(sLowPassFilters.containsKey((int)sampleRate))
+            {
+                return sLowPassFilters.get((int)sampleRate);
+            }
+
+            FIRFilterSpecification specification = FIRFilterSpecification.lowPassBuilder()
+                .sampleRate(sampleRate)
+                .gridDensity(16)
+                .passBandCutoff(passFrequency)
+                .passBandAmplitude(1.0)
+                .passBandRipple(0.01)
+                .stopBandStart(stopFrequency)
+                .stopBandAmplitude(0.0)
+                .stopBandRipple(0.01)
+                .build();
+
+            RemezFIRFilterDesigner designer = new RemezFIRFilterDesigner(specification);
+
+            //This will throw an exception if the filter cannot be designed
+            float[] taps = designer.getImpulseResponse();
+
+            sLowPassFilters.put((int)sampleRate, taps);
+
+            return taps;
+        }
     }
 }

src/main/java/io/github/dsheirer/dsp/filter/cic/RealPrimeCICDecimate.java

@@ -23,8 +23,8 @@ import io.github.dsheirer.dsp.filter.Window.WindowType;
 import io.github.dsheirer.dsp.filter.fir.real.RealFIRFilter2;
 import io.github.dsheirer.dsp.filter.halfband.real.HalfBandFilter;
 import io.github.dsheirer.sample.Listener;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
 import io.github.dsheirer.sample.buffer.ReusableBufferAssembler;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import io.github.dsheirer.sample.decimator.RealDecimator;
 import io.github.dsheirer.sample.real.RealSampleListener;
 import org.apache.commons.lang3.Validate;
@@ -124,7 +124,7 @@ public class RealPrimeCICDecimate
     /**
      * Adds a listener to receive the output of this CIC decimation filter
      */
-    public void setListener(Listener<ReusableBuffer> listener)
+    public void setListener(Listener<ReusableFloatBuffer> listener)
     {
         mOutput.setListener(listener);
     }
@@ -173,7 +173,7 @@ public class RealPrimeCICDecimate
     /**
      * Primary input method for receiving real buffers.
      */
-    public void receive(ReusableBuffer buffer)
+    public void receive(ReusableFloatBuffer buffer)
     {
         if(mFirstDecimatingStage != null)
         {
@@ -353,7 +353,7 @@ public class RealPrimeCICDecimate
     {
         /* Decimated output buffers will contain 1024 samples */
         private ReusableBufferAssembler mAssembler;
-        private Listener<ReusableBuffer> mReusableBufferListener;
+        private Listener<ReusableFloatBuffer> mReusableBufferListener;
 
         private RealFIRFilter2 mCleanupFilter;
         private HalfBandFilter mHalfBandFilter = new HalfBandFilter(
@@ -365,21 +365,21 @@ public class RealPrimeCICDecimate
                 attenuation, windowType), 0.4f);
 
             mAssembler = new ReusableBufferAssembler(outputBufferSize);
-            mAssembler.setListener(new Listener<ReusableBuffer>()
+            mAssembler.setListener(new Listener<ReusableFloatBuffer>()
             {
                 @Override
-                public void receive(ReusableBuffer reusableBuffer)
+                public void receive(ReusableFloatBuffer reusableFloatBuffer)
                 {
 
                     if(mReusableBufferListener != null)
                     {
-                        ReusableBuffer cleanupFiltered = mCleanupFilter.filter(reusableBuffer);
-                        ReusableBuffer halfBandFiltered = mHalfBandFilter.filter(cleanupFiltered);
+                        ReusableFloatBuffer cleanupFiltered = mCleanupFilter.filter(reusableFloatBuffer);
+                        ReusableFloatBuffer halfBandFiltered = mHalfBandFilter.filter(cleanupFiltered);
                         mReusableBufferListener.receive(halfBandFiltered);
                     }
                     else
                     {
-                        reusableBuffer.decrementUserCount();
+                        reusableFloatBuffer.decrementUserCount();
                     }
                 }
             });
@@ -406,7 +406,7 @@ public class RealPrimeCICDecimate
         /**
          * Adds a listener to receive output samples
          */
-        public void setListener(Listener<ReusableBuffer> listener)
+        public void setListener(Listener<ReusableFloatBuffer> listener)
         {
             mReusableBufferListener = listener;
         }

src/main/java/io/github/dsheirer/dsp/filter/dc/BufferDCFilter.java

@@ -15,8 +15,8 @@
  ******************************************************************************/
 package io.github.dsheirer.dsp.filter.dc;
 
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
 import io.github.dsheirer.sample.buffer.ReusableBufferQueue;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -77,11 +77,11 @@ public class BufferDCFilter
         }
     }
 
-    public ReusableBuffer filter(ReusableBuffer unfilteredBuffer)
+    public ReusableFloatBuffer filter(ReusableFloatBuffer unfilteredBuffer)
     {
         float[] unfilteredSamples = unfilteredBuffer.getSamples();
 
-        ReusableBuffer filteredBuffer = mReusableBufferQueue.getBuffer(unfilteredSamples.length);
+        ReusableFloatBuffer filteredBuffer = mReusableBufferQueue.getBuffer(unfilteredSamples.length);
         float[] filteredSamples = filteredBuffer.getSamples();
 
         float offset = getOffset(unfilteredSamples);

src/main/java/io/github/dsheirer/dsp/filter/dc/DCRemovalFilter.java

@@ -15,8 +15,8 @@
  ******************************************************************************/
 package io.github.dsheirer.dsp.filter.dc;
 
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
 import io.github.dsheirer.sample.buffer.ReusableBufferQueue;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 
 /**
  * DC removal filter for removing any DC offset that may be present when a signal is not aligned within the
@@ -77,9 +77,9 @@ public class DCRemovalFilter
      * @param unfilteredBuffer containing samples to filter
      * @return a new reusable buffer containing the filtered samples with the user count set to 1.
      */
-    public ReusableBuffer filter(ReusableBuffer unfilteredBuffer)
+    public ReusableFloatBuffer filter(ReusableFloatBuffer unfilteredBuffer)
     {
-        ReusableBuffer filteredBuffer = mReusableBufferQueue.getBuffer(unfilteredBuffer.getSampleCount());
+        ReusableFloatBuffer filteredBuffer = mReusableBufferQueue.getBuffer(unfilteredBuffer.getSampleCount());
 
         float[] unfilteredSamples = unfilteredBuffer.getSamples();
         float[] filteredSamples = filteredBuffer.getSamples();

src/main/java/io/github/dsheirer/dsp/filter/dc/IIRSinglePoleDCRemovalFilter.java

@@ -15,8 +15,8 @@
  ******************************************************************************/
 package io.github.dsheirer.dsp.filter.dc;
 
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
 import io.github.dsheirer.sample.buffer.ReusableBufferQueue;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import io.github.dsheirer.sample.real.RealSampleListener;
 
 public class IIRSinglePoleDCRemovalFilter implements RealSampleListener
@@ -67,9 +67,9 @@ public class IIRSinglePoleDCRemovalFilter implements RealSampleListener
      * @param inputBuffer to filter
      * @return filtered samples in a new (ie reused) output buffer
      */
-    public ReusableBuffer filter(ReusableBuffer inputBuffer)
+    public ReusableFloatBuffer filter(ReusableFloatBuffer inputBuffer)
     {
-        ReusableBuffer outputBuffer = mReusableBufferQueue.getBuffer(inputBuffer.getSampleCount());
+        ReusableFloatBuffer outputBuffer = mReusableBufferQueue.getBuffer(inputBuffer.getSampleCount());
         float[] inputSamples = inputBuffer.getSamples();
         float[] outputSamples = outputBuffer.getSamples();
 

src/main/java/io/github/dsheirer/dsp/filter/design/FilterViewer.java

@@ -61,14 +61,15 @@ public class FilterViewer extends Application
 //            .passBandRipple(0.01)
 //            .build();
 
-        FIRFilterSpecification specification = FIRFilterSpecification.bandPassBuilder()
-            .sampleRate(8000)
-            .stopFrequency1(1000)
-            .passFrequencyBegin(1100)
-            .passFrequencyEnd(1900)
-            .stopFrequency2(2000)
-            .stopRipple(0.000001)
-            .passRipple(0.00001)
+        FIRFilterSpecification specification = FIRFilterSpecification.lowPassBuilder()
+            .sampleRate(25000.0)
+            .gridDensity(16)
+            .passBandCutoff(11800)
+            .passBandAmplitude(1.0)
+            .passBandRipple(0.01)
+            .stopBandStart(12400)
+            .stopBandAmplitude(0.0)
+            .stopBandRipple(0.01)
             .build();
 
         float[] taps = null;
@@ -102,7 +103,6 @@ public class FilterViewer extends Application
             throw new IllegalStateException("Couldn't design filter");
         }
 
-
         return taps;
     }
 }

src/main/java/io/github/dsheirer/dsp/filter/fir/FIRFilterSpecification.java

@@ -299,8 +299,8 @@ public class FIRFilterSpecification
         private int mOrder;
         private Boolean mOddLength;
         private int mGridDensity = 16;
-        private int mPassBandEndFrequency;
-        private int mStopBandStartFrequency;
+        private double mPassBandEndFrequency;
+        private double mStopBandStartFrequency;
         private double mPassBandRipple;
         private double mStopBandRipple;
         private double mPassBandAmplitude = 1.0;
@@ -342,13 +342,13 @@ public class FIRFilterSpecification
             return this;
         }
 
-        public LowPassBuilder passBandCutoff(int frequencyHz)
+        public LowPassBuilder passBandCutoff(double frequencyHz)
         {
             mPassBandEndFrequency = frequencyHz;
             return this;
         }
 
-        public LowPassBuilder stopBandStart(int frequencyHz)
+        public LowPassBuilder stopBandStart(double frequencyHz)
         {
             mStopBandStartFrequency = frequencyHz;
             return this;
@@ -905,7 +905,7 @@ public class FIRFilterSpecification
      * @param stopBandRipple stop band ripple in dB
      * @return estimated filter length
      */
-    public static int estimateFilterOrder(double sampleRate, int frequency1, int frequency2,
+    public static int estimateFilterOrder(double sampleRate, double frequency1, double frequency2,
                                           double passBandRipple, double stopBandRipple)
     {
         double df = Math.abs(frequency2 - frequency1) / sampleRate;
@@ -1013,13 +1013,13 @@ public class FIRFilterSpecification
          * @param amplitude of the frequency band relative to unity (0.0 - 1.0)
          * @param ripple of the frequency band specified as db ripple
          */
-        public FrequencyBand(double sampleRate, int start, int end, double amplitude, double ripple)
+        public FrequencyBand(double sampleRate, double start, double end, double amplitude, double ripple)
         {
-            this((double)start / sampleRate, (double)end / sampleRate,
+            this(start / sampleRate, end / sampleRate,
                 amplitude, ripple);
         }
 
-        public FrequencyBand(double sampleRate, int start, int end, double amplitude, double ripple, double weight)
+        public FrequencyBand(double sampleRate, double start, double end, double amplitude, double ripple, double weight)
         {
             this(sampleRate, start, end, amplitude, ripple);
             mWeight = weight;

src/main/java/io/github/dsheirer/dsp/filter/fir/real/RealFIRFilter2.java

@@ -16,8 +16,8 @@
 package io.github.dsheirer.dsp.filter.fir.real;
 
 import io.github.dsheirer.dsp.filter.fir.FIRFilter;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
 import io.github.dsheirer.sample.buffer.ReusableBufferQueue;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 
 /**
  * Finite Impulse Response (FIR) filter for filtering individual float samples or float sample arrays.
@@ -113,11 +113,11 @@ public class RealFIRFilter2 extends FIRFilter
      * @param unfilteredBuffer containing a sample array to be filtered
      * @return a new reusable buffer with the filtered samples.
      */
-    public ReusableBuffer filter(ReusableBuffer unfilteredBuffer)
+    public ReusableFloatBuffer filter(ReusableFloatBuffer unfilteredBuffer)
     {
         float[] unfilteredSamples = unfilteredBuffer.getSamples();
 
-        ReusableBuffer filteredBuffer = mReusableBufferQueue.getBuffer(unfilteredSamples.length);
+        ReusableFloatBuffer filteredBuffer = mReusableBufferQueue.getBuffer(unfilteredSamples.length);
         float[] filteredSamples = filteredBuffer.getSamples();
 
         for(int x = 0; x < unfilteredSamples.length; x++)

src/main/java/io/github/dsheirer/dsp/filter/halfband/complex/ComplexHalfBandFilter.java

@@ -15,92 +15,94 @@
  ******************************************************************************/
 package io.github.dsheirer.dsp.filter.halfband.complex;
 
-import io.github.dsheirer.dsp.filter.halfband.real.HalfBandFilter;
+import io.github.dsheirer.dsp.filter.Filters;
+import io.github.dsheirer.dsp.filter.halfband.real.HalfBandFilter2;
+import io.github.dsheirer.dsp.mixer.Oscillator;
 import io.github.dsheirer.sample.buffer.ReusableComplexBuffer;
+import io.github.dsheirer.sample.buffer.ReusableComplexBufferQueue;
 
 public class ComplexHalfBandFilter
 {
-    private HalfBandFilter mIFilter;
-    private HalfBandFilter mQFilter;
-    private boolean mDecimate;
-    private boolean mDecimateFlag;
+    private ReusableComplexBufferQueue mBufferQueue = new ReusableComplexBufferQueue("ComplexHalfBandFilter");
 
-    /**
-     * @param coefficients
-     * @param gain
-     * @param decimate
-     */
-    public ComplexHalfBandFilter(float[] coefficients, float gain, boolean decimate)
+    private HalfBandFilter2 mIFilter;
+    private HalfBandFilter2 mQFilter;
+    private float mResidualISample;
+    private float mResidualQSample;
+    private boolean mHasResidual;
+    private int mOutputBufferLength;
+    private float[] mSamples;
+    private int mSamplesPointer;
+    private float[] mFilteredSamples;
+    private int mFilteredSamplesPointer;
+
+    public ComplexHalfBandFilter(float[] coefficients, float gain)
     {
-        mIFilter = new HalfBandFilter(coefficients, gain);
-        mQFilter = new HalfBandFilter(coefficients, gain);
-        mDecimate = decimate;
+        mIFilter = new HalfBandFilter2(coefficients, gain);
+        mQFilter = new HalfBandFilter2(coefficients, gain);
     }
 
-    public void dispose()
+    public ReusableComplexBuffer filter(ReusableComplexBuffer originalBuffer)
     {
-        mIFilter.dispose();
-        mQFilter.dispose();
+        mSamples = originalBuffer.getSamples();
+        mSamplesPointer = 0;
+
+        mOutputBufferLength = (mHasResidual ? (mSamples.length + 2) : mSamples.length) / 4 * 2;
+
+        ReusableComplexBuffer filteredBuffer = mBufferQueue.getBuffer(mOutputBufferLength);
+        mFilteredSamples = filteredBuffer.getSamples();
+        mFilteredSamplesPointer = 0;
+
+        if(mHasResidual)
+        {
+            mFilteredSamples[mFilteredSamplesPointer++] = mIFilter.filter(mResidualISample, mSamples[mSamplesPointer++]);
+            mFilteredSamples[mFilteredSamplesPointer++] = mQFilter.filter(mResidualQSample, mSamples[mSamplesPointer++]);
+            mHasResidual = false;
+        }
+
+        while(mSamplesPointer + 3 < mSamples.length)
+        {
+            mFilteredSamples[mFilteredSamplesPointer++] = mIFilter.filter(mSamples[mSamplesPointer], mSamples[mSamplesPointer + 2]);
+            mFilteredSamples[mFilteredSamplesPointer++] = mIFilter.filter(mSamples[mSamplesPointer + 1], mSamples[mSamplesPointer + 3]);
+            mSamplesPointer += 4;
+        }
+
+        if(mSamplesPointer < mSamples.length)
+        {
+            mHasResidual = true;
+            mResidualISample = mSamples[mSamplesPointer++];
+            mResidualQSample = mSamples[mSamplesPointer];
+        }
+
+        originalBuffer.decrementUserCount();
+        return filteredBuffer;
     }
 
-    public ReusableComplexBuffer filter(ReusableComplexBuffer buffer)
+    public static void main(String[] args)
     {
-        throw new IllegalStateException("This filter has to be updated to work with reusable buffers");
+        Oscillator oscillator = new Oscillator(1, 16);
+        ComplexHalfBandFilter filter = new ComplexHalfBandFilter(Filters.HALF_BAND_FILTER_27T.getCoefficients(), 1.0f);
+
+        ReusableComplexBufferQueue bufferQueue = new ReusableComplexBufferQueue("Test");
+
+        ReusableComplexBuffer complexBuffer = bufferQueue.getBuffer(8);
+        oscillator.generateComplex(complexBuffer);
+        ReusableComplexBuffer filteredBuffer = filter.filter(complexBuffer);
+        filteredBuffer.decrementUserCount();
+
+        ReusableComplexBuffer complexBuffer2 = bufferQueue.getBuffer(10);
+        oscillator.generateComplex(complexBuffer2);
+        ReusableComplexBuffer filteredBuffer2 = filter.filter(complexBuffer2);
+        filteredBuffer2.decrementUserCount();
+
+        ReusableComplexBuffer complexBuffer3 = bufferQueue.getBuffer(8);
+        oscillator.generateComplex(complexBuffer3);
+        ReusableComplexBuffer filteredBuffer3 = filter.filter(complexBuffer3);
+        filteredBuffer3.decrementUserCount();
+
+
+
+
 
-//        if(mDecimate)
-//        {
-//            float[] samples = buffer.getSamples();
-//
-//            int half = samples.length / 2;
-//
-//            float[] decimated;
-//
-//            if(half % 2 == 0 || mDecimateFlag)
-//            {
-//                decimated = new float[half];
-//            }
-//            else
-//            {
-//                /* If inbound buffer size is odd-length, then we have to
-//                 * adjust when the first operation is non-decimation, since
-//                 * that will produce an outbound buffer 1 sample larger */
-//                decimated = new float[half + 1];
-//            }
-//
-//            int decimatedPointer = 0;
-//
-//            for(int x = 0; x < samples.length; x += 2)
-//            {
-//                /* Insert the sample but don't filter */
-//                if(mDecimateFlag)
-//                {
-//                    mIFilter.insert(samples[x]);
-//                    mQFilter.insert(samples[x + 1]);
-//                }
-//                else
-//                {
-//                    decimated[decimatedPointer++] = mIFilter.filter(samples[x]);
-//                    decimated[decimatedPointer++] = mQFilter.filter(samples[x + 1]);
-//                }
-//
-//                /* Toggle the decimation flag for every sample */
-//                mDecimateFlag = !mDecimateFlag;
-//            }
-//
-//            //return buffer
-//        }
-//        else
-//        {
-//            /* Non Decimate - filter each of the values and return the buffer */
-//            float[] samples = buffer.getSamples();
-//
-//            for(int x = 0; x < samples.length; x += 2)
-//            {
-//                samples[x] = mIFilter.filter(samples[x]);
-//                samples[x + 1] = mQFilter.filter(samples[x + 1]);
-//            }
-//
-//            //return buffer
-//        }
     }
 }

src/main/java/io/github/dsheirer/dsp/filter/halfband/real/HalfBandFilter.java

@@ -17,10 +17,11 @@
  ******************************************************************************/
 package io.github.dsheirer.dsp.filter.halfband.real;
 
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
 import io.github.dsheirer.sample.buffer.ReusableBufferQueue;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import org.apache.commons.lang3.Validate;
 
+@Deprecated
 public class HalfBandFilter
 {
     private float[] mBuffer;
@@ -84,10 +85,10 @@ public class HalfBandFilter
         mBufferPointer = mBufferPointer % mBufferSize;
     }
 
-    public ReusableBuffer filter(ReusableBuffer input)
+    public ReusableFloatBuffer filter(ReusableFloatBuffer input)
     {
         float[] inputSamples = input.getSamples();
-		ReusableBuffer output = mReusableBufferQueue.getBuffer(inputSamples.length);
+		ReusableFloatBuffer output = mReusableBufferQueue.getBuffer(inputSamples.length);
 		float[] outputSamples = output.getSamples();
 
 		for(int x = 0; x < inputSamples.length; x++)

src/main/java/io/github/dsheirer/dsp/filter/halfband/real/HalfBandFilter2.java

@@ -0,0 +1,89 @@
+/*******************************************************************************
+ * sdr-trunk
+ * Copyright (C) 2014-2018 Dennis Sheirer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by  the Free Software Foundation, either version 3 of the License, or  (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful,  but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License  along with this program.
+ * If not, see <http://www.gnu.org/licenses/>
+ *
+ ******************************************************************************/
+package io.github.dsheirer.dsp.filter.halfband.real;
+
+/**
+ * Implements a half-band filter that produces one filtered output for every two input samples.
+ *
+ * This filter is structured for Java 8+ compiler JIT optimization for SIMD instructions when
+ * supported by the host CPU.
+ */
+public class HalfBandFilter2
+{
+    private static final float CENTER_COEFFICIENT = 0.5f;
+    private float[] mCoefficients;
+    private float[] mEvenSamples;
+    private float[] mOddSamples;
+    private int mCenterSampleIndex;
+    private float mAccumulator;
+    private int mPointer;
+    private float mGain;
+
+    /**
+     * Creates a half band filter with inherent decimation by two.
+     *
+     * @param coefficients of the half-band filter that is odd-length where all odd index coefficients are
+     * zero valued except for the middle odd index coefficient which should be valued 0.5
+     * @param gain value to apply to the output
+     */
+    public HalfBandFilter2(float[] coefficients, float gain)
+    {
+        if(coefficients.length % 2 == 0)
+        {
+            throw new IllegalArgumentException("Half-band filter coefficients must be odd-length");
+        }
+
+        mGain = gain;
+
+        int half = coefficients.length / 2 + 1;
+
+        mCoefficients = new float[half];
+        mEvenSamples = new float[half];
+
+        //Use only the even coefficients since the odd coefficients are all zero-valued
+        for(int x = 0; x < coefficients.length; x += 2)
+        {
+            mCoefficients[x / 2] = coefficients[x];
+        }
+
+        //Setup the odd samples array as a simple delay line, half the size of the even samples array
+        mOddSamples = new float[half / 2];
+        mCenterSampleIndex = mOddSamples.length - 1;
+    }
+
+    public float filter(float sample1, float sample2)
+    {
+        //Structured for SIMD array copy optimization when supported by host CPU
+        System.arraycopy(mEvenSamples, 0, mEvenSamples, 1, mEvenSamples.length - 1);
+        System.arraycopy(mOddSamples, 0, mOddSamples, 1, mOddSamples.length - 1);
+
+        mEvenSamples[0] = sample1;
+        mOddSamples[0] = sample2;
+
+        mAccumulator = 0.0f;
+
+        //Structured for SIMD dot.product optimization when supported by host CPU
+        for(mPointer = 0; mPointer < mEvenSamples.length; mPointer++)
+        {
+            mAccumulator += (mEvenSamples[mPointer] * mCoefficients[mPointer]);
+        }
+
+        mAccumulator += (mOddSamples[mCenterSampleIndex] * CENTER_COEFFICIENT);
+        mAccumulator *= mGain;
+
+        return mAccumulator;
+    }
+}

src/main/java/io/github/dsheirer/dsp/filter/resample/RealResampler.java

@@ -18,8 +18,8 @@ package io.github.dsheirer.dsp.filter.resample;
 import com.laszlosystems.libresample4j.Resampler;
 import com.laszlosystems.libresample4j.SampleBuffers;
 import io.github.dsheirer.sample.Listener;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
 import io.github.dsheirer.sample.buffer.ReusableBufferQueue;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -32,7 +32,7 @@ public class RealResampler
 
     private ReusableBufferQueue mReusableBufferQueue = new ReusableBufferQueue("RealResampler");
     private Resampler mResampler;
-    private Listener<ReusableBuffer> mResampledListener;
+    private Listener<ReusableFloatBuffer> mResampledListener;
     private BufferManager mBufferManager;
     private double mResampleFactor;
 
@@ -50,11 +50,11 @@ public class RealResampler
 
     /**
      * Primary input method to the resampler
-     * @param reusableBuffer to resample
+     * @param reusableFloatBuffer to resample
      */
-    public void resample(ReusableBuffer reusableBuffer)
+    public void resample(ReusableFloatBuffer reusableFloatBuffer)
     {
-        mBufferManager.load(reusableBuffer);
+        mBufferManager.load(reusableFloatBuffer);
         mResampler.process(mResampleFactor, mBufferManager, false);
     }
 
@@ -62,7 +62,7 @@ public class RealResampler
      * Registers the listener to receive the resampled buffer output
      * @param resampledBufferListener to receive buffers
      */
-    public void setListener(Listener<ReusableBuffer> resampledBufferListener)
+    public void setListener(Listener<ReusableFloatBuffer> resampledBufferListener)
     {
         mResampledListener = resampledBufferListener;
     }
@@ -89,10 +89,10 @@ public class RealResampler
         /**
          * Queues the buffer sample for resampling
          */
-        public void load(ReusableBuffer reusableBuffer)
+        public void load(ReusableFloatBuffer reusableFloatBuffer)
         {
-            mInputBuffer.put(reusableBuffer.getSamples());
-            reusableBuffer.decrementUserCount();
+            mInputBuffer.put(reusableFloatBuffer.getSamples());
+            reusableFloatBuffer.decrementUserCount();
         }
 
         @Override
@@ -128,7 +128,7 @@ public class RealResampler
 
             while(mOutputBuffer.position() > mOutputBufferSize)
             {
-                ReusableBuffer outputBuffer = mReusableBufferQueue.getBuffer(mOutputBufferSize);
+                ReusableFloatBuffer outputBuffer = mReusableBufferQueue.getBuffer(mOutputBufferSize);
 
                 mOutputBuffer.flip();
                 mOutputBuffer.get(outputBuffer.getSamples());

src/main/java/io/github/dsheirer/dsp/fm/FMDemodulator.java

@@ -17,9 +17,9 @@
  ******************************************************************************/
 package io.github.dsheirer.dsp.fm;
 
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
 import io.github.dsheirer.sample.buffer.ReusableBufferQueue;
 import io.github.dsheirer.sample.buffer.ReusableComplexBuffer;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import io.github.dsheirer.sample.complex.Complex;
 
 /**
@@ -129,9 +129,9 @@ public class FMDemodulator
      * @param basebandSampleBuffer containing samples to demodulate
      * @return demodulated sample buffer.
      */
-    public ReusableBuffer demodulate(ReusableComplexBuffer basebandSampleBuffer)
+    public ReusableFloatBuffer demodulate(ReusableComplexBuffer basebandSampleBuffer)
     {
-        ReusableBuffer demodulatedBuffer = mReusableBufferQueue.getBuffer(basebandSampleBuffer.getSampleCount());
+        ReusableFloatBuffer demodulatedBuffer = mReusableBufferQueue.getBuffer(basebandSampleBuffer.getSampleCount());
 
         float[] basebandSamples = basebandSampleBuffer.getSamples();
         float[] demodulatedSamples = demodulatedBuffer.getSamples();

src/main/java/io/github/dsheirer/dsp/fsk/LTRDecoder.java

@@ -23,7 +23,7 @@ import io.github.dsheirer.dsp.filter.fir.real.RealFIRFilter2;
 import io.github.dsheirer.dsp.filter.fir.remez.RemezFIRFilterDesigner;
 import io.github.dsheirer.dsp.symbol.ISyncDetectListener;
 import io.github.dsheirer.sample.Listener;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -43,7 +43,7 @@ import org.slf4j.LoggerFactory;
  * adjustment may not fully compensate for mis-tuned signals and may result in missed decodes of idle bursts.  However,
  * the DC filter will track a mis-tuned signal to baseband quickly upon a continuous transmission.
  */
-public class LTRDecoder implements Listener<ReusableBuffer>, ISyncDetectListener, ISyncStateListener
+public class LTRDecoder implements Listener<ReusableFloatBuffer>, ISyncDetectListener, ISyncStateListener
 {
     private final static Logger mLog = LoggerFactory.getLogger(LTRDecoder.class);
 
@@ -134,6 +134,12 @@ public class LTRDecoder implements Listener<ReusableBuffer>, ISyncDetectListener
         mSynchronizationMonitor.syncDetected();
     }
 
+    @Override
+    public void syncLost()
+    {
+        //no-op
+    }
+
     /**
      * Processes the buffer samples by converting all samples to boolean values reflecting if the sample value is
      * greater than zero (or not).  Average symbol timing offset is calculated for the full buffer and the offset is
@@ -142,10 +148,10 @@ public class LTRDecoder implements Listener<ReusableBuffer>, ISyncDetectListener
      * @param buffer containing 8.0 kHz unfiltered FM demodulated audio samples with sub-audible LTR signalling.
      */
     @Override
-    public void receive(ReusableBuffer buffer)
+    public void receive(ReusableFloatBuffer buffer)
     {
-        ReusableBuffer dcFiltered = mDCFilter.filter(buffer);
-        ReusableBuffer lowPassFiltered = mLowPassFilter.filter(dcFiltered);
+        ReusableFloatBuffer dcFiltered = mDCFilter.filter(buffer);
+        ReusableFloatBuffer lowPassFiltered = mLowPassFilter.filter(dcFiltered);
 
         for(float sample : lowPassFiltered.getSamples())
         {

src/main/java/io/github/dsheirer/dsp/fsk/SynchronizationMonitor.java

@@ -30,13 +30,13 @@ import org.slf4j.LoggerFactory;
  *
  * Synchronization States:
  *
- *  -COARSE - default state.  demoted from MEDIUM after one message period with no sync detection.
+ * -COARSE - default state.  demoted from MEDIUM after one message period with no sync detection.
  *
- *  -MEDIUM - promoted from COARSE when one sync detection occurs after two message periods, or demoted from FINE
- *            after two message periods with no sync detections.
+ * -MEDIUM - promoted from COARSE when one sync detection occurs after two message periods, or demoted from FINE
+ * after two message periods with no sync detections.
  *
- *  -FINE   - promoted from MEDIUM after two or more consecutive sync detections within the preceding two or more
- *            message periods.
+ * -FINE   - promoted from MEDIUM after two or more consecutive sync detections within the preceding two or more
+ * message periods.
  */
 public class SynchronizationMonitor implements ISyncDetectListener
 {
@@ -50,6 +50,7 @@ public class SynchronizationMonitor implements ISyncDetectListener
 
     /**
      * Constructs the synchronization monitor for the specified message symbol length.
+     *
      * @param messageLength in symbols.
      */
     public SynchronizationMonitor(int messageLength)
@@ -127,6 +128,12 @@ public class SynchronizationMonitor implements ISyncDetectListener
         updateSyncState();
     }
 
+    @Override
+    public void syncLost()
+    {
+        //no-op
+    }
+
     /**
      * Increments the symbol count for each decoded symbol.
      */

src/main/java/io/github/dsheirer/dsp/gain/AutomaticGainControl.java

@@ -2,8 +2,8 @@ package io.github.dsheirer.dsp.gain;
 
 import io.github.dsheirer.buffer.DoubleCircularBuffer;
 import io.github.dsheirer.buffer.RealCircularBuffer;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
 import io.github.dsheirer.sample.buffer.ReusableBufferQueue;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 
 /*******************************************************************************
  *     SDR Trunk 
@@ -147,9 +147,9 @@ public class AutomaticGainControl
      * @param input samples to process
      * @return output samples with gain applied
      */
-    public ReusableBuffer process(ReusableBuffer input)
+    public ReusableFloatBuffer process(ReusableFloatBuffer input)
     {
-        ReusableBuffer output = mReusableBufferQueue.getBuffer(input.getSampleCount());
+        ReusableFloatBuffer output = mReusableBufferQueue.getBuffer(input.getSampleCount());
 
         float[] inputSamples = input.getSamples();
         float[] outputSamples = output.getSamples();

src/main/java/io/github/dsheirer/dsp/mixer/AbstractOscillator.java

@@ -15,8 +15,8 @@
  ******************************************************************************/
 package io.github.dsheirer.dsp.mixer;
 
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
 import io.github.dsheirer.sample.buffer.ReusableComplexBuffer;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import io.github.dsheirer.sample.complex.Complex;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -127,8 +127,8 @@ public abstract class AbstractOscillator implements IOscillator
 
         for(int x = 0; x < sampleCount; x++)
         {
-            samples[x] = inphase();
             rotate();
+            samples[x] = quadrature();
         }
 
         return samples;
@@ -182,11 +182,11 @@ public abstract class AbstractOscillator implements IOscillator
 
     /**
      * Generates enough real samples to fill the reusable buffer
-     * @param reusableBuffer to fill with real samples
+     * @param reusableFloatBuffer to fill with real samples
      */
     @Override
-    public void generateReal(ReusableBuffer reusableBuffer)
+    public void generateReal(ReusableFloatBuffer reusableFloatBuffer)
     {
-        reusableBuffer.reloadFrom(generateReal(reusableBuffer.getSampleCount()), System.currentTimeMillis());
+        reusableFloatBuffer.reloadFrom(generateReal(reusableFloatBuffer.getSampleCount()), System.currentTimeMillis());
     }
 }

src/main/java/io/github/dsheirer/dsp/mixer/IOscillator.java

@@ -15,8 +15,8 @@
  ******************************************************************************/
 package io.github.dsheirer.dsp.mixer;
 
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
 import io.github.dsheirer.sample.buffer.ReusableComplexBuffer;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 
 /**
  * Oscillator interface.
@@ -102,9 +102,9 @@ public interface IOscillator
      * Generates real samples and fills the reusable buffer using the current system time in millis for
      * the update timestamp.
      *
-     * @param reusableBuffer to fill with complex samples
+     * @param reusableFloatBuffer to fill with complex samples
      */
-    void generateReal(ReusableBuffer reusableBuffer);
+    void generateReal(ReusableFloatBuffer reusableFloatBuffer);
 
     /**
      * Mixes (heterodynes) the complex sample array using the current settings of this oscillator.

src/main/java/io/github/dsheirer/dsp/mixer/LowPhaseNoiseOscillator.java

@@ -18,6 +18,10 @@ package io.github.dsheirer.dsp.mixer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.concurrent.TimeUnit;
+
 public class LowPhaseNoiseOscillator extends AbstractOscillator
 {
     private final static Logger mLog = LoggerFactory.getLogger(LowPhaseNoiseOscillator.class);
@@ -82,4 +86,54 @@ public class LowPhaseNoiseOscillator extends AbstractOscillator
         //Update the gain value for the next rotation
         mGain = THREE_HALVES - ((mPreviousInphase * mPreviousInphase) + (mPreviousQuadrature * mPreviousQuadrature));
     }
+
+    public static long process(AbstractOscillator oscillator, int iterations, int sampleCount)
+    {
+        long start = System.nanoTime();
+
+        for(int x = 0; x < iterations; x++)
+        {
+            float[] samples = oscillator.generateComplex(sampleCount);
+        }
+
+        long duration = System.nanoTime() - start;
+
+        return duration;
+    }
+
+    public static void main(String[] args)
+    {
+        mLog.debug("Starting ...");
+        SimpleDateFormat sdf = new SimpleDateFormat("mm:ss.SSS");
+
+        AbstractOscillator lpno = new LowPhaseNoiseOscillator(100, 800);
+        AbstractOscillator regular = new Oscillator(100, 800);
+
+        int iterations = 10000;
+        int sampleCount = 1000000;
+
+        mLog.debug("Warm up - lpno");
+        process(lpno, iterations, sampleCount);
+        process(lpno, iterations, sampleCount);
+        process(lpno, iterations, sampleCount);
+
+        mLog.debug("Warm up - regular");
+        process(regular, iterations, sampleCount);
+        process(regular, iterations, sampleCount);
+        process(regular, iterations, sampleCount);
+
+        mLog.debug("Test - lpno");
+        process(lpno, iterations, sampleCount);
+        process(lpno, iterations, sampleCount);
+        long duration = process(lpno, iterations, sampleCount);
+        mLog.debug("Duration Low Phase Noise: " + sdf.format(new Date(TimeUnit.NANOSECONDS.toMillis(duration))));
+
+        mLog.debug("Test - regular");
+        process(regular, iterations, sampleCount);
+        process(regular, iterations, sampleCount);
+        duration = process(regular, iterations, sampleCount);
+        mLog.debug("Duration         Regular: " + sdf.format(new Date(TimeUnit.NANOSECONDS.toMillis(duration))));
+
+//        mLog.debug("                   Delta: " + sdf.format(new Date(TimeUnit.NANOSECONDS.toMillis(duration2 - duration))));
+    }
 }

src/main/java/io/github/dsheirer/dsp/psk/DQPSKDecisionDirectedSymbolEvaluator.java

@@ -95,10 +95,45 @@ public class DQPSKDecisionDirectedSymbolEvaluator implements IPSKSymbolEvaluator
 
         //Since we've rotated the error symbol back to 0 radians, the quadrature value closely approximates the
         //arctan of the error angle relative to 0 radians and this provides our error value
-        mPhaseError = -mEvaluationSymbol.quadrature();
+        float errorNormalized = normalize(mEvaluationSymbol.quadrature(), 0.3f);
+
+        mPhaseError = -errorNormalized;
 
         //Timing error is the same as phase error with the sign corrected according to the vector's angular rotation
-        mTimingError = mEvaluationSymbol.quadrature() * mTimingErrorPolarity;
+        mTimingError = errorNormalized * mTimingErrorPolarity;
+    }
+
+    /**
+     * Constrains value to the range of ( -maximum <> maximum )
+     */
+    private static float clip(float value, float maximum)
+    {
+        if(value > maximum)
+        {
+            return maximum;
+        }
+        else if(value < -maximum)
+        {
+            return -maximum;
+        }
+
+        return value;
+    }
+
+    /**
+     * Constrains timing error to +/- the maximum value and corrects any
+     * floating point invalid numbers
+     */
+    private float normalize(float error, float maximum)
+    {
+        if(Float.isNaN(error))
+        {
+            return 0.0f;
+        }
+        else
+        {
+            return clip(error, maximum);
+        }
     }
 
     /**

src/main/java/io/github/dsheirer/dsp/psk/DQPSKGardnerSymbolEvaluator.java

@@ -100,7 +100,7 @@ public class DQPSKGardnerSymbolEvaluator implements IPSKSymbolEvaluator<Dibit>
 
         //Since we've rotated the error symbol back to 0 radians, the quadrature value closely approximates the
         //arctan of the error angle relative to 0 radians and this provides our error value
-        mPhaseError = -mEvaluationSymbol.quadrature();
+        mPhaseError = normalize(-mEvaluationSymbol.quadrature(), 0.3f);
     }
 
     /**

src/main/java/io/github/dsheirer/dsp/psk/pll/AdaptivePLLGainMonitor.java

@@ -0,0 +1,119 @@
+/*******************************************************************************
+ * sdr-trunk
+ * Copyright (C) 2014-2018 Dennis Sheirer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by  the Free Software Foundation, either version 3 of the License, or  (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful,  but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License  along with this program.
+ * If not, see <http://www.gnu.org/licenses/>
+ *
+ ******************************************************************************/
+package io.github.dsheirer.dsp.psk.pll;
+
+import io.github.dsheirer.dsp.symbol.ISyncDetectListener;
+import io.github.dsheirer.module.decode.p25.P25Decoder;
+import io.github.dsheirer.source.SourceEvent;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Monitors decode sync events to adaptively control PLL loop gain.
+ */
+public class AdaptivePLLGainMonitor implements ISyncDetectListener, IFrequencyErrorProcessor
+{
+    private final static Logger mLog = LoggerFactory.getLogger(AdaptivePLLGainMonitor.class);
+
+    private static final int MAX_SYNC_COUNT = 6;
+    private CostasLoop mCostasLoop;
+    private P25Decoder mP25Decoder;
+    private PLLGain mPLLGain = PLLGain.LEVEL_1;
+    private int mSyncCount;
+
+    /**
+     * Constructs an adaptive monitor to monitor the sync state of a decoder and adjust the gain
+     * level of the costas loop accordingly.
+     *
+     * @param costasLoop to receive adaptive gain updates.
+     * @param p25Decoder to receive frequency error source events
+     */
+    public AdaptivePLLGainMonitor(CostasLoop costasLoop, P25Decoder p25Decoder)
+    {
+        mCostasLoop = costasLoop;
+        mCostasLoop.setPLLGain(mPLLGain);
+        mCostasLoop.setFrequencyErrorProcessor(this);
+        mP25Decoder = p25Decoder;
+    }
+
+    /**
+     * Sync detection event.  Updates the running sync count and updates the PLL gain level.
+     */
+    @Override
+    public void syncDetected()
+    {
+        mSyncCount++;
+        update();
+    }
+
+    /**
+     * Sync loss event.  Updates the running sync count and updates the PLL gain level.
+     */
+    @Override
+    public void syncLost()
+    {
+        mSyncCount -= 2;
+        update();
+    }
+
+    /**
+     * Updates the gain state for a sync detect or sync loss
+     */
+    private void update()
+    {
+        if(mSyncCount < 0)
+        {
+            mSyncCount = 0;
+            return;
+        }
+
+        if(mSyncCount > MAX_SYNC_COUNT)
+        {
+            mSyncCount = MAX_SYNC_COUNT;
+            return;
+        }
+
+        PLLGain gain = PLLGain.fromSyncCount(mSyncCount);
+
+        //Only update the costas loop if the gain value changes
+        if(gain != mPLLGain)
+        {
+            mPLLGain = gain;
+            mCostasLoop.setPLLGain(mPLLGain);
+        }
+    }
+
+    /**
+     * Resets the monitor and commands the PLL to use the highest gain level.
+     */
+    public void reset()
+    {
+        mSyncCount = 0;
+        mPLLGain = PLLGain.LEVEL_1;
+        mCostasLoop.setPLLGain(mPLLGain);
+    }
+
+    @Override
+    public void processFrequencyError(long frequencyError)
+    {
+        //Only rebroadcast the costas loop frequency error if the gain level has progressed above the
+        //default gain of 1, meaning that we have received at least 2 sync events
+        if(mPLLGain != PLLGain.LEVEL_1)
+        {
+            mP25Decoder.broadcast(SourceEvent.frequencyErrorMeasurement(frequencyError));
+        }
+    }
+}

src/main/java/io/github/dsheirer/dsp/psk/pll/CostasLoop.java

@@ -41,10 +41,12 @@ public class CostasLoop implements IPhaseLockedLoop
     private double mDamping = Math.sqrt(2.0) / 2.0;
     private double mAlphaGain;
     private double mBetaGain;
-    private Tracking mTracking = Tracking.FASTEST;
+    private PLLGain mPLLGain = PLLGain.LEVEL_1;
     private double mSymbolRate;
     private double mSampleRate;
-    private int mCounter;
+    private IFrequencyErrorProcessor mFrequencyErrorProcessor;
+    private long mFrequencyError;
+    private int mBaudCounter;
 
     /**
      * Costas Loop for tracking and correcting frequency error in a received carrier signal.
@@ -60,6 +62,17 @@ public class CostasLoop implements IPhaseLockedLoop
         updateLoopBandwidth();
     }
 
+    /**
+     * Registers the listener to receive the measured frequency error as tracked by the PLL at one
+     * second intervals.
+     *
+     * @param listener to receive frequency error measurement.
+     */
+    public void setFrequencyErrorProcessor(IFrequencyErrorProcessor listener)
+    {
+        mFrequencyErrorProcessor = listener;
+    }
+
     /**
      * Corrects the current phase tracker when an inverted output is detected.  The inversion will take the form of
      * +/- 90 degrees or +/- 180 degrees, although the latter correction is equal regardless of the sign.
@@ -89,21 +102,21 @@ public class CostasLoop implements IPhaseLockedLoop
      */
     private void updateLoopBandwidth()
     {
-        double bandwidth = TWO_PI / mTracking.getLoopBandwidth();
+        double bandwidth = TWO_PI / mPLLGain.getLoopBandwidth();
 
         mAlphaGain = (4.0 * mDamping * bandwidth) / (1.0 + (2.0 * mDamping * bandwidth) + (bandwidth * bandwidth));
         mBetaGain = (4.0 * bandwidth * bandwidth) / (1.0 + (2.0 * mDamping * bandwidth) + (bandwidth * bandwidth));
     }
 
     /**
-     * Sets the tracking state for this costas loop.  The tracking state affects the aggressiveness of the alpha/beta
+     * Sets the PLLGain state for this costas loop.  The PLLGain state affects the aggressiveness of the alpha/beta
      * gain values in synchronizing with the signal carrier.
      *
-     * @param tracking
+     * @param PLLGain
      */
-    public void setTracking(Tracking tracking)
+    public void setPLLGain(PLLGain PLLGain)
     {
-        mTracking = tracking;
+        mPLLGain = PLLGain;
         updateLoopBandwidth();
     }
 
@@ -159,7 +172,7 @@ public class CostasLoop implements IPhaseLockedLoop
         mLoopFrequency += (mBetaGain * phaseError);
         mLoopPhase += mLoopFrequency + (mAlphaGain * phaseError);
 
-        /* Normalize phase between +/- 2 * PI */
+        //Normalize phase between +/- 2 * PI
         if(mLoopPhase > TWO_PI)
         {
             mLoopPhase -= TWO_PI;
@@ -170,7 +183,7 @@ public class CostasLoop implements IPhaseLockedLoop
             mLoopPhase += TWO_PI;
         }
 
-        /* Limit frequency to +/- maximum loop frequency */
+        //Limit frequency to +/- maximum loop frequency
         if(mLoopFrequency > mMaximumLoopFrequency)
         {
             mLoopFrequency = mMaximumLoopFrequency;
@@ -181,17 +194,25 @@ public class CostasLoop implements IPhaseLockedLoop
             mLoopFrequency = -mMaximumLoopFrequency;
         }
 
-        //TODO: broadcast channel offset to the tuner to use in auto-adjusting tuner PPM
-//        mCounter++;
-//
-//        if(mCounter > (5 * mSymbolRate))
-//        {
-//            mCounter = 0;
-//            mLog.info("Current Costas Loop Frequency: " + mLoopFrequency + " [" +
-//                (int)(mSampleRate / TWO_PI * mLoopFrequency) + " Hz Offset] sample rate [" + mSampleRate + "]");
-//        }
+        //Broadcast current frequency error measurement once a second to an external listener
+        mBaudCounter++;
+
+        if(mBaudCounter > mSymbolRate)
+        {
+            mBaudCounter = 0;
+
+            mFrequencyError = (long)(mSampleRate / TWO_PI * mLoopFrequency);
+
+            if(mFrequencyErrorProcessor != null)
+            {
+                mFrequencyErrorProcessor.processFrequencyError(mFrequencyError);
+            }
+        }
     }
 
+    /**
+     * Resets the PLL internal tracking values
+     */
     @Override
     public void reset()
     {

src/main/java/io/github/dsheirer/dsp/psk/pll/IFrequencyErrorProcessor.java

@@ -16,27 +16,14 @@
 package io.github.dsheirer.dsp.psk.pll;
 
 /**
- * Phase Locked Loop (PLL) tracking bandwidth - controls how fast/slow the PLL tracks the carrier frequency
+ * Interface for passing frequency error measurements.
  */
-public enum Tracking
+public interface IFrequencyErrorProcessor
 {
-    FASTEST(50.0),
-    FAST(100.0),
-    NORMAL(200.0),
-    SLOW(400.0);
-
-    private double mLoopBandwidth;
-
-    Tracking(double loopBandwidth)
-    {
-        mLoopBandwidth = loopBandwidth;
-    }
-
     /**
-     * Loop bandwidth setting
+     * Provides a frequency error measurement to the listener.
+     *
+     * @param error value as measured by the provider
      */
-    public double getLoopBandwidth()
-    {
-        return mLoopBandwidth;
-    }
+    void processFrequencyError(long error);
 }

src/main/java/io/github/dsheirer/dsp/psk/pll/PLLGain.java

@@ -0,0 +1,89 @@
+/*******************************************************************************
+ * sdr-trunk
+ * Copyright (C) 2014-2018 Dennis Sheirer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by  the Free Software Foundation, either version 3 of the License, or  (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful,  but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License  along with this program.
+ * If not, see <http://www.gnu.org/licenses/>
+ *
+ ******************************************************************************/
+package io.github.dsheirer.dsp.psk.pll;
+
+/**
+ * Phase Locked Loop (PLL) tracking bandwidth - controls how fast/slow the PLL tracks the carrier frequency
+ */
+public enum PLLGain
+{
+    //NOTE: static gain level of 200 produced the best results for releases prior to 0.3.4b2
+
+    LEVEL_1(150.0, 0, 1),
+    LEVEL_2(170.0, 2, 4),
+    LEVEL_3(190.0, 5, 6),
+    LEVEL_4(200.0, 7, 8),
+    LEVEL_5(200.0, 9, 10);
+
+    private double mLoopBandwidth;
+    private int mRangeStart;
+    private int mRangeEnd;
+
+    PLLGain(double loopBandwidth, int start, int end)
+    {
+        mLoopBandwidth = loopBandwidth;
+        mRangeStart = start;
+        mRangeEnd = end;
+    }
+
+    /**
+     * Loop bandwidth setting
+     */
+    public double getLoopBandwidth()
+    {
+        return mLoopBandwidth;
+    }
+
+    public int getRangeStart()
+    {
+        return mRangeStart;
+    }
+
+    public int getRangeEnd()
+    {
+        return mRangeEnd;
+    }
+
+    /**
+     * Look up PLL gain from a running sync detection count.
+     *
+     * @param syncCount 0-10
+     * @return PLL gain appropriate for the sync detection value
+     */
+    public static PLLGain fromSyncCount(int syncCount)
+    {
+        if(syncCount <= LEVEL_1.getRangeEnd())
+        {
+            return LEVEL_1;
+        }
+        else if(syncCount <= LEVEL_2.getRangeEnd())
+        {
+            return LEVEL_2;
+        }
+        else if(syncCount <= LEVEL_3.getRangeEnd())
+        {
+            return LEVEL_3;
+        }
+        else if(syncCount <= LEVEL_4.getRangeEnd())
+        {
+            return LEVEL_4;
+        }
+        else
+        {
+            return LEVEL_5;
+        }
+    }
+}

src/main/java/io/github/dsheirer/dsp/symbol/DibitToByteBufferAssembler.java

@@ -0,0 +1,125 @@
+/*******************************************************************************
+ * sdr-trunk
+ * Copyright (C) 2014-2018 Dennis Sheirer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by  the Free Software Foundation, either version 3 of the License, or  (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful,  but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License  along with this program.
+ * If not, see <http://www.gnu.org/licenses/>
+ *
+ ******************************************************************************/
+package io.github.dsheirer.dsp.symbol;
+
+import io.github.dsheirer.sample.Listener;
+import io.github.dsheirer.sample.buffer.IReusableByteBufferProvider;
+import io.github.dsheirer.sample.buffer.ReusableByteBuffer;
+import io.github.dsheirer.sample.buffer.ReusableByteBufferQueue;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Assembles reusable byte buffers from an incoming stream of Dibits.
+ */
+public class DibitToByteBufferAssembler implements Listener<Dibit>, IReusableByteBufferProvider
+{
+    private final static Logger mLog = LoggerFactory.getLogger(DibitToByteBufferAssembler.class);
+
+    private ReusableByteBufferQueue mBufferQueue = new ReusableByteBufferQueue("DibitToByteBufferAssembler");
+    private ReusableByteBuffer mCurrentBuffer;
+    private int mBufferPointer;
+    private int mBufferSize;
+    private byte mCurrentByte;
+    private int mDibitCount;
+    private Listener<ReusableByteBuffer> mBufferListener;
+
+    /**
+     * Constructs an assembler to produce reusable byte buffers of the specified size
+     *
+     * @param bufferSize
+     */
+    public DibitToByteBufferAssembler(int bufferSize)
+    {
+        mBufferSize = bufferSize;
+        getNextBuffer();
+    }
+
+    /**
+     * Broadcasts the current buffer to the registered listener and creates a new buffer, resetting
+     * the buffer pointer to zero so that new dibits can be loaded.
+     */
+    private void getNextBuffer()
+    {
+        if(mCurrentBuffer != null && mBufferListener != null)
+        {
+            mBufferListener.receive(mCurrentBuffer);
+        }
+
+        mCurrentBuffer = mBufferQueue.getBuffer(mBufferSize);
+        mBufferPointer = 0;
+    }
+
+    @Override
+    public void receive(Dibit dibit)
+    {
+        mCurrentByte <<= 2;
+
+        switch(dibit)
+        {
+            case D01_PLUS_3:
+                mCurrentByte |= 0x01;
+                break;
+            case D00_PLUS_1:
+                //no-op - value is already 00
+                break;
+            case D10_MINUS_1:
+                mCurrentByte |= 0x02;
+                break;
+            case D11_MINUS_3:
+                mCurrentByte |= 0x03;
+                break;
+        }
+
+        mDibitCount++;
+
+        if(mDibitCount >= 4)
+        {
+            mCurrentBuffer.getBytes()[mBufferPointer++] = mCurrentByte;
+            mCurrentByte = 0x00;
+            mDibitCount = 0;
+
+            if(mBufferPointer >= mBufferSize)
+            {
+                getNextBuffer();
+            }
+        }
+    }
+
+    /**
+     * Registers the listener to receive fully assembled byte buffers from this assembler.
+     */
+    @Override
+    public void setBufferListener(Listener<ReusableByteBuffer> listener)
+    {
+        mBufferListener = listener;
+    }
+
+    /**
+     * Removes the listener from receiving buffers from this assembler
+     */
+    @Override
+    public void removeBufferListener(Listener<ReusableByteBuffer> listener)
+    {
+        mBufferListener = null;
+    }
+
+    @Override
+    public boolean hasBufferListeners()
+    {
+        return mBufferListener != null;
+    }
+}

src/main/java/io/github/dsheirer/dsp/symbol/ISyncDetectListener.java

@@ -15,7 +15,13 @@
  ******************************************************************************/
 package io.github.dsheirer.dsp.symbol;
 
+/**
+ * Listener interface to be notified each time a sync pattern has been detected and/or when the sync
+ * has been lost.
+ */
 public interface ISyncDetectListener
 {
-	void syncDetected();
+    void syncDetected();
+
+    void syncLost();
 }

src/main/java/io/github/dsheirer/gui/channelizer/ChannelizerViewer.java

@@ -259,7 +259,8 @@ public class ChannelizerViewer extends JFrame
 
             for(int x = 0; x < mChannelCount; x++)
             {
-                TunerChannelSource source = mTestTuner.getChannelSourceManager().getTestingSource(x);
+                TunerChannel tunerChannel = new TunerChannel(100000000, 12500);
+                TunerChannelSource source = mTestTuner.getChannelSourceManager().getSource(tunerChannel, null);
                 DiscreteChannelPanel channelPanel = new DiscreteChannelPanel(mSettingsManager, source, x);
                 channelPanel.setDFTSize(mChannelPanelDFTSize);
 
@@ -361,7 +362,7 @@ public class ChannelizerViewer extends JFrame
             mComplexDecibelConverter.addListener(mSpectrumPanel);
 
             TunerChannel tunerChannel = new TunerChannel(frequency, bandwidth);
-            mSource = mTestTuner.getChannelSourceManager().getSource(tunerChannel);
+            mSource = mTestTuner.getChannelSourceManager().getSource(tunerChannel, null);
 
             if(mSource != null)
             {
@@ -555,7 +556,7 @@ public class ChannelizerViewer extends JFrame
             {
                 if(sourceCount < maxSourceCount)
                 {
-                    TunerChannelSource source = tuner.getChannelSourceManager().getSource(tunerChannel);
+                    TunerChannelSource source = tuner.getChannelSourceManager().getSource(tunerChannel, null);
 
                     if(source != null)
                     {

src/main/java/io/github/dsheirer/gui/channelizer/ChannelizerViewer2.java

@@ -23,6 +23,7 @@ import io.github.dsheirer.source.ISourceEventProcessor;
 import io.github.dsheirer.source.SourceEvent;
 import io.github.dsheirer.source.SourceException;
 import io.github.dsheirer.source.tuner.Tuner;
+import io.github.dsheirer.source.tuner.channel.ChannelSpecification;
 import io.github.dsheirer.source.tuner.channel.TunerChannel;
 import io.github.dsheirer.source.tuner.channel.TunerChannelSource;
 import io.github.dsheirer.source.tuner.configuration.TunerConfigurationModel;
@@ -376,10 +377,11 @@ public class ChannelizerViewer2 extends JFrame
             mComplexDecibelConverter.addListener(mSpectrumPanel);
 
             TunerChannel tunerChannel = new TunerChannel(frequency, bandwidth);
-            mSource = mTestTuner.getChannelSourceManager().getSource(tunerChannel);
+            mSource = mTestTuner.getChannelSourceManager().getSource(tunerChannel, new ChannelSpecification(50000, 12500, 6000, 7000));
 
             if(mSource != null)
             {
+                mLog.debug("Channel: " + mSource.getTunerChannel() + " Rate:" + mSource.getSampleRate());
                 mSource.setListener(new Listener<ReusableComplexBuffer>()
                 {
                     @Override

src/main/java/io/github/dsheirer/gui/channelizer/SynthesizerViewer.java

@@ -281,7 +281,7 @@ public class SynthesizerViewer extends JFrame
         {
             try
             {
-                float[] taps = FilterFactory.getSincM2Synthesizer(12500.0, 2, 12);
+                float[] taps = FilterFactory.getSincM2Synthesizer( 25000.0, 12500.0, 2, 12);
                 mSynthesizer = new TwoChannelSynthesizerM2(taps);
             }
             catch(FilterDesignException fde)

src/main/java/io/github/dsheirer/gui/instrument/DemodulatorViewerFX.java

@@ -34,6 +34,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.File;
+import java.util.prefs.Preferences;
 
 /**
  * Application for viewing and working with demodulators and recording files.
@@ -42,6 +43,9 @@ public class DemodulatorViewerFX extends Application
 {
     private final static Logger mLog = LoggerFactory.getLogger(DemodulatorViewerFX.class);
 
+    private static final String PREFERENCE_FILE_OPEN_DEFAULT_FOLDER = "default.folder";
+
+    private Preferences mPreferences = Preferences.userNodeForPackage(DemodulatorViewerFX.class);
     private Stage mStage;
     private MenuBar mMenuBar;
     private RecentFilesMenu mRecentFilesMenu;
@@ -117,9 +121,22 @@ public class DemodulatorViewerFX extends Application
                 {
                     FileChooser fileChooser = new FileChooser();
                     fileChooser.setTitle("Open an I/Q recording file");
+
+                    String directory = mPreferences.get(PREFERENCE_FILE_OPEN_DEFAULT_FOLDER, null);
+
+                    if(directory != null)
+                    {
+                        fileChooser.setInitialDirectory(new File(directory));
+                    }
+
                     File file = fileChooser.showOpenDialog(mStage);
-                    getViewerDesktop().load(file);
-                    getRecentFilesMenu().add(file);
+
+                    if(file != null)
+                    {
+                        getViewerDesktop().load(file);
+                        getRecentFilesMenu().add(file);
+                        mPreferences.put(PREFERENCE_FILE_OPEN_DEFAULT_FOLDER, file.getParent());
+                    }
                 }
             });
 

src/main/java/io/github/dsheirer/gui/instrument/PlaybackController.java

@@ -17,8 +17,8 @@ package io.github.dsheirer.gui.instrument;
 
 import io.github.dsheirer.gui.instrument.decoder.AbstractDecoderPane;
 import io.github.dsheirer.sample.Listener;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
 import io.github.dsheirer.sample.buffer.ReusableBufferBroadcaster;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import io.github.dsheirer.source.IControllableFileSource;
 import io.github.dsheirer.source.IFrameLocationListener;
 import io.github.dsheirer.source.wave.ComplexWaveSource;
@@ -177,7 +177,7 @@ public class PlaybackController extends HBox implements IFrameLocationListener
     /**
      * Adds listener to receive complex buffers from this playback
      */
-    public void addListener(Listener<ReusableBuffer> listener)
+    public void addListener(Listener<ReusableFloatBuffer> listener)
     {
         mReusableBufferBroadcaster.addListener(listener);
     }
@@ -185,7 +185,7 @@ public class PlaybackController extends HBox implements IFrameLocationListener
     /**
      * Removes the listener from receiving complex buffers from this playback
      */
-    public void removeListener(Listener<ReusableBuffer> listener)
+    public void removeListener(Listener<ReusableFloatBuffer> listener)
     {
         mReusableBufferBroadcaster.removeListener(listener);
     }

src/main/java/io/github/dsheirer/gui/instrument/RecentFilesMenu.java

@@ -26,6 +26,7 @@ import java.util.prefs.Preferences;
 
 public class RecentFilesMenu extends Menu implements EventHandler<ActionEvent>
 {
+    private static final String PREFERENCE_RECENT_FILE = ".recent.file.";
     private Preferences mPreferences = Preferences.userNodeForPackage(RecentFilesMenu.class);
     private IFileSelectionListener mFileSelectionListener;
     private String mIdentifier;
@@ -111,7 +112,7 @@ public class RecentFilesMenu extends Menu implements EventHandler<ActionEvent>
      */
     private String getKey(int index)
     {
-        return mIdentifier + ".recent.file." + index;
+        return mIdentifier + PREFERENCE_RECENT_FILE + index;
     }
 
     /**

src/main/java/io/github/dsheirer/gui/instrument/chart/DoubleLineChart.java

@@ -21,6 +21,7 @@ import javafx.collections.FXCollections;
 import javafx.collections.ObservableList;
 import javafx.scene.chart.LineChart;
 import javafx.scene.chart.NumberAxis;
+import javafx.scene.chart.ValueAxis;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -42,6 +43,24 @@ public class DoubleLineChart extends LineChart implements Listener<Double>
         init(length);
     }
 
+    /**
+     * Sets the minimum displayable value for the y axis
+     * @param min
+     */
+    public void setMin(double min)
+    {
+        ((ValueAxis)getYAxis()).setLowerBound(min);
+    }
+
+    /**
+     * Sets the maximum displayable value for the y axis
+     * @param max
+     */
+    public void setMax(double max)
+    {
+        ((ValueAxis)getYAxis()).setUpperBound(max);
+    }
+
     private void init(int length)
     {
         mDoubleCircularBuffer = new DoubleCircularBuffer(length);

src/main/java/io/github/dsheirer/gui/instrument/chart/RealSampleLineChart.java

@@ -17,7 +17,7 @@ package io.github.dsheirer.gui.instrument.chart;
 
 import io.github.dsheirer.buffer.RealCircularBuffer;
 import io.github.dsheirer.sample.Listener;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import javafx.collections.FXCollections;
 import javafx.collections.ObservableList;
 import javafx.scene.chart.LineChart;
@@ -27,7 +27,7 @@ import javafx.scene.layout.StackPane;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-public class RealSampleLineChart extends LineChart implements Listener<ReusableBuffer>
+public class RealSampleLineChart extends LineChart implements Listener<ReusableFloatBuffer>
 {
     private final static Logger mLog = LoggerFactory.getLogger(RealSampleLineChart.class);
     private ObservableList<Data<Integer,Float>> mSamples = FXCollections.observableArrayList();
@@ -65,7 +65,7 @@ public class RealSampleLineChart extends LineChart implements Listener<ReusableB
     }
 
     @Override
-    public void receive(ReusableBuffer buffer)
+    public void receive(ReusableFloatBuffer buffer)
     {
         for(float sample: buffer.getSamples())
         {

src/main/java/io/github/dsheirer/gui/instrument/chart/SamplesPerSymbolChart.java

@@ -0,0 +1,59 @@
+/*******************************************************************************
+ * sdr-trunk
+ * Copyright (C) 2014-2018 Dennis Sheirer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by  the Free Software Foundation, either version 3 of the License, or  (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful,  but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License  along with this program.
+ * If not, see <http://www.gnu.org/licenses/>
+ *
+ ******************************************************************************/
+package io.github.dsheirer.gui.instrument.chart;
+
+import javafx.collections.ObservableList;
+
+public class SamplesPerSymbolChart extends DoubleLineChart
+{
+    private double mFractionalSamplesPerSymbol;
+    private double mPreviousSamplesPerSymbol;
+
+    public SamplesPerSymbolChart(int length, double samplesPerSymbol)
+    {
+        super("Samples Per Symbol", -1.0, 1.0, 0.1, length);
+        setSamplesPerSymbol(samplesPerSymbol);
+    }
+
+    public void setSamplesPerSymbol(double samplesPerSymbol)
+    {
+        mFractionalSamplesPerSymbol = samplesPerSymbol - ((int)samplesPerSymbol);
+        mPreviousSamplesPerSymbol = samplesPerSymbol;
+
+        ObservableList<Series> seriesList = getData();
+        seriesList.get(0).setName("Samples Per Symbol:" + samplesPerSymbol);
+    }
+
+    @Override
+    public void receive(Double samplesPerSymbol)
+    {
+        double delta = samplesPerSymbol - mPreviousSamplesPerSymbol - mFractionalSamplesPerSymbol;
+
+        while(delta < (-1.0 + mFractionalSamplesPerSymbol))
+        {
+            delta++;
+        }
+
+        while(delta > 1.0)
+        {
+            delta--;
+        }
+
+        super.receive(delta);
+
+        mPreviousSamplesPerSymbol = samplesPerSymbol;
+    }
+}

src/main/java/io/github/dsheirer/gui/instrument/decoder/AbstractAFSK1200Pane.java

@@ -23,7 +23,7 @@ import io.github.dsheirer.gui.instrument.chart.RealSampleLineChart;
 import io.github.dsheirer.message.Message;
 import io.github.dsheirer.module.decode.DecoderType;
 import io.github.dsheirer.sample.Listener;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import javafx.scene.layout.HBox;
 import javafx.scene.layout.Priority;
 import javafx.scene.layout.VBox;
@@ -52,7 +52,7 @@ public abstract class AbstractAFSK1200Pane extends RealDecoderPane
     private void init()
     {
         //This is force-cast without type checking ....
-        addListener((Listener<ReusableBuffer>)getDecoder());
+        addListener((Listener<ReusableFloatBuffer>)getDecoder());
 
         addListener(getSampleLineChart());
 

src/main/java/io/github/dsheirer/gui/instrument/decoder/AbstractDecoderPane.java

@@ -17,10 +17,10 @@ package io.github.dsheirer.gui.instrument.decoder;
 
 import io.github.dsheirer.sample.Listener;
 import io.github.dsheirer.sample.SampleType;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import javafx.scene.layout.VBox;
 
-public abstract class AbstractDecoderPane<T extends ReusableBuffer> extends VBox implements Listener<T>
+public abstract class AbstractDecoderPane<T extends ReusableFloatBuffer> extends VBox implements Listener<T>
 {
     abstract SampleType getSampleType();
 

src/main/java/io/github/dsheirer/gui/instrument/decoder/LJ1200Pane.java

@@ -44,6 +44,12 @@ public class LJ1200Pane extends AbstractAFSK1200Pane
                 {
                     mLog.debug("Tower Sync Detected!");
                 }
+
+                @Override
+                public void syncLost()
+                {
+                    //no-op
+                }
             });
             mDecoder.getTransponderMessageFramer().setSyncDetectListener(new ISyncDetectListener()
             {
@@ -52,6 +58,12 @@ public class LJ1200Pane extends AbstractAFSK1200Pane
                 {
                     mLog.debug("Transponder Sync Detected!");
                 }
+
+                @Override
+                public void syncLost()
+                {
+                    //no-op
+                }
             });
         }
 

src/main/java/io/github/dsheirer/gui/instrument/decoder/MDC1200Pane.java

@@ -44,6 +44,12 @@ public class MDC1200Pane extends AbstractAFSK1200Pane
                 {
                     mLog.debug("Sync Detected!");
                 }
+
+                @Override
+                public void syncLost()
+                {
+                    mLog.debug("Sync Lost!");
+                }
             });
         }
 

src/main/java/io/github/dsheirer/gui/instrument/decoder/MPT1327Pane.java

@@ -44,6 +44,12 @@ public class MPT1327Pane extends AbstractAFSK1200Pane
                 {
 //                    mLog.debug("Control Sync Detected!");
                 }
+
+                @Override
+                public void syncLost()
+                {
+                    //no-op
+                }
             });
             mDecoder.getTrafficMessageFramer().setSyncDetectListener(new ISyncDetectListener()
             {
@@ -52,6 +58,12 @@ public class MPT1327Pane extends AbstractAFSK1200Pane
                 {
 //                    mLog.debug("Traffic Sync Detected!");
                 }
+
+                @Override
+                public void syncLost()
+                {
+                    //no-op
+                }
             });
         }
 

src/main/java/io/github/dsheirer/gui/instrument/decoder/P25Phase1LSMPane.java

@@ -19,6 +19,7 @@ import io.github.dsheirer.gui.instrument.chart.ComplexSampleLineChart;
 import io.github.dsheirer.gui.instrument.chart.DoubleLineChart;
 import io.github.dsheirer.gui.instrument.chart.EyeDiagramChart;
 import io.github.dsheirer.gui.instrument.chart.PhaseLineChart;
+import io.github.dsheirer.gui.instrument.chart.SamplesPerSymbolChart;
 import io.github.dsheirer.gui.instrument.chart.SymbolChart;
 import io.github.dsheirer.message.Message;
 import io.github.dsheirer.module.decode.DecoderType;
@@ -34,14 +35,14 @@ public class P25Phase1LSMPane extends ComplexDecoderPane
 {
     private final static Logger mLog = LoggerFactory.getLogger(P25Phase1LSMPane.class);
 
-    private HBox mSampleChartBox;
-    private ComplexSampleLineChart mSampleLineChart;
+    private HBox mTopChartBox;
+    private ComplexSampleLineChart mDifferentialDemodulatedSamplesChartBox;
     private EyeDiagramChart mEyeDiagramChart;
-    private HBox mDecoderChartBox;
-    private SymbolChart mSymbolChart;
+    private HBox mBottomChartBox;
+    private SymbolChart mSymbolConstellationChart;
     private PhaseLineChart mPLLPhaseErrorLineChart;
     private DoubleLineChart mPLLFrequencyLineChart;
-    private DoubleLineChart mSamplesPerSymbolLineChart;
+    private SamplesPerSymbolChart mSamplesPerSymbolLineChart;
     private ReusableBufferBroadcaster mFilteredBufferBroadcaster = new ReusableBufferBroadcaster();
     private P25DecoderLSMInstrumented mDecoder = new P25DecoderLSMInstrumented(null);
 
@@ -56,16 +57,16 @@ public class P25Phase1LSMPane extends ComplexDecoderPane
         addListener(getDecoder());
 
         getDecoder().setFilteredBufferListener(mFilteredBufferBroadcaster);
-        getDecoder().setComplexSymbolListener(getSymbolChart());
+        getDecoder().setComplexSymbolListener(getSymbolConstellationChart());
         getDecoder().setPLLPhaseErrorListener(getPLLPhaseErrorLineChart());
         getDecoder().setPLLFrequencyListener(getPLLFrequencyLineChart());
         getDecoder().setSymbolDecisionDataListener(getEyeDiagramChart());
         getDecoder().setSamplesPerSymbolListener(getSamplesPerSymbolLineChart());
-        mFilteredBufferBroadcaster.addListener(getSampleLineChart());
+        mFilteredBufferBroadcaster.addListener(getDifferentialDemodulatedSamplesChartBox());
 
-        HBox.setHgrow(getSampleChartBox(), Priority.ALWAYS);
-        HBox.setHgrow(getDecoderChartBox(), Priority.ALWAYS);
-        getChildren().addAll(getSampleChartBox(), getDecoderChartBox());
+        HBox.setHgrow(getTopChartBox(), Priority.ALWAYS);
+        HBox.setHgrow(getBottomChartBox(), Priority.ALWAYS);
+        getChildren().addAll(getTopChartBox(), getBottomChartBox());
 
         mDecoder.setMessageListener(new Listener<Message>()
         {
@@ -86,7 +87,8 @@ public class P25Phase1LSMPane extends ComplexDecoderPane
         mDecoder.setSampleRate(sampleRate);
         double samplesPerSymbol = sampleRate / 4800.0;
 
-        getSampleLineChart().setSamplesPerSymbol((int)samplesPerSymbol);
+        getDifferentialDemodulatedSamplesChartBox().setSamplesPerSymbol((int)samplesPerSymbol);
+        getSamplesPerSymbolLineChart().setSamplesPerSymbol(samplesPerSymbol);
     }
 
     private P25DecoderLSMInstrumented getDecoder()
@@ -94,69 +96,69 @@ public class P25Phase1LSMPane extends ComplexDecoderPane
         return mDecoder;
     }
 
-    private SymbolChart getSymbolChart()
+    private SymbolChart getSymbolConstellationChart()
     {
-        if(mSymbolChart == null)
+        if(mSymbolConstellationChart == null)
         {
-            mSymbolChart = new SymbolChart(10);
+            mSymbolConstellationChart = new SymbolChart(10);
         }
 
-        return mSymbolChart;
+        return mSymbolConstellationChart;
     }
 
-    private HBox getDecoderChartBox()
+    private HBox getBottomChartBox()
     {
-        if(mDecoderChartBox == null)
+        if(mBottomChartBox == null)
         {
-            mDecoderChartBox = new HBox();
-            mDecoderChartBox.setMaxHeight(Double.MAX_VALUE);
-            getSymbolChart().setMaxWidth(Double.MAX_VALUE);
+            mBottomChartBox = new HBox();
+            mBottomChartBox.setMaxHeight(Double.MAX_VALUE);
+            getSymbolConstellationChart().setMaxWidth(Double.MAX_VALUE);
             getPLLPhaseErrorLineChart().setMaxWidth(Double.MAX_VALUE);
             getPLLFrequencyLineChart().setMaxWidth(Double.MAX_VALUE);
-            HBox.setHgrow(getSymbolChart(), Priority.ALWAYS);
+            HBox.setHgrow(getSymbolConstellationChart(), Priority.ALWAYS);
             HBox.setHgrow(getPLLPhaseErrorLineChart(), Priority.ALWAYS);
             HBox.setHgrow(getPLLFrequencyLineChart(), Priority.ALWAYS);
-            mDecoderChartBox.getChildren().addAll(getSymbolChart(), getPLLPhaseErrorLineChart(),
+            mBottomChartBox.getChildren().addAll(getSymbolConstellationChart(), getPLLPhaseErrorLineChart(),
                 getPLLFrequencyLineChart());
         }
 
-        return mDecoderChartBox;
+        return mBottomChartBox;
     }
 
-    private HBox getSampleChartBox()
+    private HBox getTopChartBox()
     {
-        if(mSampleChartBox == null)
+        if(mTopChartBox == null)
         {
-            mSampleChartBox = new HBox();
-            mSampleChartBox.setMaxHeight(Double.MAX_VALUE);
-            getSampleLineChart().setMaxWidth(Double.MAX_VALUE);
+            mTopChartBox = new HBox();
+            mTopChartBox.setMaxHeight(Double.MAX_VALUE);
+            getDifferentialDemodulatedSamplesChartBox().setMaxWidth(Double.MAX_VALUE);
             getEyeDiagramChart().setMaxWidth(Double.MAX_VALUE);
             getSamplesPerSymbolLineChart().setMaxWidth(Double.MAX_VALUE);
-            HBox.setHgrow(getSampleLineChart(), Priority.ALWAYS);
+            HBox.setHgrow(getDifferentialDemodulatedSamplesChartBox(), Priority.ALWAYS);
             HBox.setHgrow(getEyeDiagramChart(), Priority.ALWAYS);
             HBox.setHgrow(getSamplesPerSymbolLineChart(), Priority.ALWAYS);
-            mSampleChartBox.getChildren().addAll(getSampleLineChart(), getEyeDiagramChart(),
+            mTopChartBox.getChildren().addAll(getDifferentialDemodulatedSamplesChartBox(), getEyeDiagramChart(),
                 getSamplesPerSymbolLineChart());
         }
 
-        return mSampleChartBox;
+        return mTopChartBox;
     }
 
-    private ComplexSampleLineChart getSampleLineChart()
+    private ComplexSampleLineChart getDifferentialDemodulatedSamplesChartBox()
     {
-        if(mSampleLineChart == null)
+        if(mDifferentialDemodulatedSamplesChartBox == null)
         {
-            mSampleLineChart = new ComplexSampleLineChart(100, 10);
+            mDifferentialDemodulatedSamplesChartBox = new ComplexSampleLineChart(100, 10);
         }
 
-        return mSampleLineChart;
+        return mDifferentialDemodulatedSamplesChartBox;
     }
 
     private EyeDiagramChart getEyeDiagramChart()
     {
         if(mEyeDiagramChart == null)
         {
-            mEyeDiagramChart = new EyeDiagramChart(10, "Middle: 3-4 / Symbol: 8-9");
+            mEyeDiagramChart = new EyeDiagramChart(10, "Symbol/Eye Diagram");
         }
 
         return mEyeDiagramChart;
@@ -176,17 +178,17 @@ public class P25Phase1LSMPane extends ComplexDecoderPane
     {
         if(mPLLFrequencyLineChart == null)
         {
-            mPLLFrequencyLineChart = new DoubleLineChart( "PLL Frequency", -500, 500, 50, 40);
+            mPLLFrequencyLineChart = new DoubleLineChart( "PLL Frequency", -2500, 2500, 200, 40);
         }
 
         return mPLLFrequencyLineChart;
     }
 
-    private DoubleLineChart getSamplesPerSymbolLineChart()
+    private SamplesPerSymbolChart getSamplesPerSymbolLineChart()
     {
         if(mSamplesPerSymbolLineChart == null)
         {
-            mSamplesPerSymbolLineChart = new DoubleLineChart( "Sample Point", 9.5, 11.5, 0.1, 40);
+            mSamplesPerSymbolLineChart = new SamplesPerSymbolChart(40, 6.25);
         }
 
         return mSamplesPerSymbolLineChart;

src/main/java/io/github/dsheirer/gui/instrument/decoder/RealDecoderPane.java

@@ -18,11 +18,11 @@ package io.github.dsheirer.gui.instrument.decoder;
 import io.github.dsheirer.module.decode.DecoderType;
 import io.github.dsheirer.sample.Listener;
 import io.github.dsheirer.sample.SampleType;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
 import io.github.dsheirer.sample.buffer.ReusableBufferBroadcaster;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import javafx.scene.text.Text;
 
-public class RealDecoderPane extends AbstractDecoderPane<ReusableBuffer>
+public class RealDecoderPane extends AbstractDecoderPane<ReusableFloatBuffer>
 {
     private ReusableBufferBroadcaster mBufferBroadcaster = new ReusableBufferBroadcaster();
     private DecoderType mDecoderType;
@@ -47,17 +47,17 @@ public class RealDecoderPane extends AbstractDecoderPane<ReusableBuffer>
     }
 
     @Override
-    public void receive(ReusableBuffer reusableBuffer)
+    public void receive(ReusableFloatBuffer reusableFloatBuffer)
     {
-        mBufferBroadcaster.broadcast(reusableBuffer);
+        mBufferBroadcaster.broadcast(reusableFloatBuffer);
     }
 
-    public void addListener(Listener<ReusableBuffer> listener)
+    public void addListener(Listener<ReusableFloatBuffer> listener)
     {
         mBufferBroadcaster.addListener(listener);
     }
 
-    public void removeListener(Listener<ReusableBuffer> listener)
+    public void removeListener(Listener<ReusableFloatBuffer> listener)
     {
         mBufferBroadcaster.removeListener(listener);
     }

src/main/java/io/github/dsheirer/gui/instrument/decoder/Tait1200Pane.java

@@ -44,6 +44,12 @@ public class Tait1200Pane extends AbstractAFSK1200Pane
                 {
                     mLog.debug("ANI Sync Detected!");
                 }
+
+                @Override
+                public void syncLost()
+                {
+
+                }
             });
             mDecoder.getGPSMessageFramer().setSyncDetectListener(new ISyncDetectListener()
             {
@@ -52,6 +58,12 @@ public class Tait1200Pane extends AbstractAFSK1200Pane
                 {
                     mLog.debug("GPS Sync Detected!");
                 }
+
+                @Override
+                public void syncLost()
+                {
+
+                }
             });
         }
 

src/main/java/io/github/dsheirer/module/ProcessingChain.java

@@ -49,11 +49,14 @@ import io.github.dsheirer.sample.Broadcaster;
 import io.github.dsheirer.sample.Listener;
 import io.github.dsheirer.sample.buffer.IReusableBufferListener;
 import io.github.dsheirer.sample.buffer.IReusableBufferProvider;
+import io.github.dsheirer.sample.buffer.IReusableByteBufferListener;
+import io.github.dsheirer.sample.buffer.IReusableByteBufferProvider;
 import io.github.dsheirer.sample.buffer.IReusableComplexBufferListener;
 import io.github.dsheirer.sample.buffer.ReusableAudioPacket;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
 import io.github.dsheirer.sample.buffer.ReusableBufferBroadcaster;
+import io.github.dsheirer.sample.buffer.ReusableByteBuffer;
 import io.github.dsheirer.sample.buffer.ReusableComplexBuffer;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import io.github.dsheirer.source.ComplexSource;
 import io.github.dsheirer.source.ISourceEventListener;
 import io.github.dsheirer.source.ISourceEventProvider;
@@ -93,8 +96,9 @@ public class ProcessingChain implements IChannelEventListener
     private final static Logger mLog = LoggerFactory.getLogger(ProcessingChain.class);
 
     private ReusableBufferBroadcaster<ReusableAudioPacket> mAudioPacketBroadcaster = new ReusableBufferBroadcaster<>();
-    private ReusableBufferBroadcaster<ReusableBuffer> mDemodulatedAudioBufferBroadcaster = new ReusableBufferBroadcaster();
+    private ReusableBufferBroadcaster<ReusableFloatBuffer> mDemodulatedAudioBufferBroadcaster = new ReusableBufferBroadcaster();
     private ReusableBufferBroadcaster<ReusableComplexBuffer> mBasebandComplexBufferBroadcaster = new ReusableBufferBroadcaster();
+    private ReusableBufferBroadcaster<ReusableByteBuffer> mDemodulatedBitstreamBufferBroadcaster = new ReusableBufferBroadcaster();
     private Broadcaster<AttributeChangeRequest> mAttributeChangeRequestBroadcaster = new Broadcaster<>();
     private Broadcaster<CallEvent> mCallEventBroadcaster = new Broadcaster<>();
     private Broadcaster<ChannelEvent> mChannelEventBroadcaster = new Broadcaster<>();
@@ -163,6 +167,7 @@ public class ProcessingChain implements IChannelEventListener
         mCallEventBroadcaster.dispose();
         mChannelEventBroadcaster.dispose();
         mBasebandComplexBufferBroadcaster.dispose();
+        mDemodulatedBitstreamBufferBroadcaster.dispose();
         mMessageBroadcaster.dispose();
         mSquelchStateBroadcaster.dispose();
     }
@@ -323,6 +328,11 @@ public class ProcessingChain implements IChannelEventListener
             mDemodulatedAudioBufferBroadcaster.addListener(((IReusableBufferListener)module).getReusableBufferListener());
         }
 
+        if(module instanceof IReusableByteBufferListener)
+        {
+            mDemodulatedBitstreamBufferBroadcaster.addListener(((IReusableByteBufferListener)module).getReusableByteBufferListener());
+        }
+
         if(module instanceof IReusableComplexBufferListener)
         {
             mBasebandComplexBufferBroadcaster.addListener(((IReusableComplexBufferListener)module).getReusableComplexBufferListener());
@@ -385,6 +395,11 @@ public class ProcessingChain implements IChannelEventListener
             mDemodulatedAudioBufferBroadcaster.removeListener(((IReusableBufferListener)module).getReusableBufferListener());
         }
 
+        if(module instanceof IReusableByteBufferListener)
+        {
+            mDemodulatedBitstreamBufferBroadcaster.removeListener(((IReusableByteBufferListener) module).getReusableByteBufferListener());
+        }
+
         if(module instanceof IReusableComplexBufferListener)
         {
             mBasebandComplexBufferBroadcaster.removeListener(((IReusableComplexBufferListener) module).getReusableComplexBufferListener());
@@ -452,6 +467,11 @@ public class ProcessingChain implements IChannelEventListener
             ((IMessageProvider) module).setMessageListener(mMessageBroadcaster);
         }
 
+        if(module instanceof IReusableByteBufferProvider)
+        {
+            ((IReusableByteBufferProvider)module).setBufferListener(mDemodulatedBitstreamBufferBroadcaster);
+        }
+
         if(module instanceof IReusableBufferProvider)
         {
             ((IReusableBufferProvider)module).setBufferListener(mDemodulatedAudioBufferBroadcaster);
@@ -484,6 +504,11 @@ public class ProcessingChain implements IChannelEventListener
             ((IAudioPacketProvider) module).setAudioPacketListener(null);
         }
 
+        if(module instanceof IReusableByteBufferProvider)
+        {
+            ((IReusableByteBufferProvider)module).removeBufferListener(mDemodulatedBitstreamBufferBroadcaster);
+        }
+
         if(module instanceof ICallEventProvider)
         {
             ((ICallEventProvider) module).removeCallEventListener(mCallEventBroadcaster);
@@ -540,16 +565,10 @@ public class ProcessingChain implements IChannelEventListener
         {
             if(mSource != null)
             {
-                //Reset each of the modules
-                for(Module module : mModules)
-                {
-                    module.reset();
-                }
-
                 //Broadcast the source sample rate so that each of the modules can self-configure
                 mSourceEventBroadcaster.broadcast(SourceEvent.sampleRateChange(mSource.getSampleRate(), "Processing Chain Startup"));
 
-                //Broadcast the source center frequencysample rate so that each of the modules can self-configure
+                //Broadcast the source center frequency / sample rate so that each of the modules can self-configure
                 mSourceEventBroadcaster.broadcast(SourceEvent.frequencyChange(mSource.getFrequency(), "Processing Chain Startup"));
 
                 //Setup the channel state to monitor source overflow conditions
@@ -627,6 +646,12 @@ public class ProcessingChain implements IChannelEventListener
             {
                 module.stop();
             }
+
+            //Reset each of the modules
+            for(Module module : mModules)
+            {
+                module.reset();
+            }
         }
     }
 
@@ -790,7 +815,7 @@ public class ProcessingChain implements IChannelEventListener
     /**
      * Adds listener to receive demodulated audio buffers from an modules that produce demodulated audio.
      */
-    public void addDemodulatedAudioListener(Listener<ReusableBuffer> listener)
+    public void addDemodulatedAudioListener(Listener<ReusableFloatBuffer> listener)
     {
         mDemodulatedAudioBufferBroadcaster.addListener(listener);
     }
@@ -798,7 +823,7 @@ public class ProcessingChain implements IChannelEventListener
     /**
      * Removes the listener from receiving demodulated audio buffers.
      */
-    public void removeDemodulatedAudioListener(Listener<ReusableBuffer> listener)
+    public void removeDemodulatedAudioListener(Listener<ReusableFloatBuffer> listener)
     {
         mDemodulatedAudioBufferBroadcaster.removeListener(listener);
     }

src/main/java/io/github/dsheirer/module/decode/DecoderFactory.java

@@ -93,6 +93,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.util.ArrayList;
+import java.util.EnumSet;
 import java.util.List;
 
 public class DecoderFactory
@@ -346,7 +347,6 @@ public class DecoderFactory
                 filters.add(new MPT1327MessageFilter());
                 break;
             case P25_PHASE1:
-            case P25_PHASE2:
                 filters.add(new P25MessageFilterSet());
                 break;
             case PASSPORT:
@@ -467,4 +467,14 @@ public class DecoderFactory
 
         return null;
     }
+
+    /**
+     * Decoder(s) that support bitstreams.
+     *
+     * @return set of decoders that support bitstreams.
+     */
+    public static EnumSet<DecoderType> getBitstreamDecoders()
+    {
+        return EnumSet.of(DecoderType.P25_PHASE1);
+    }
 }

src/main/java/io/github/dsheirer/module/decode/DecoderType.java

@@ -1,19 +1,17 @@
 /*******************************************************************************
- *     SDR Trunk 
- *     Copyright (C) 2014 Dennis Sheirer
- * 
- *     This program is free software: you can redistribute it and/or modify
- *     it under the terms of the GNU General Public License as published by
- *     the Free Software Foundation, either version 3 of the License, or
- *     (at your option) any later version.
- * 
- *     This program is distributed in the hope that it will be useful,
- *     but WITHOUT ANY WARRANTY; without even the implied warranty of
- *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *     GNU General Public License for more details.
- * 
- *     You should have received a copy of the GNU General Public License
- *     along with this program.  If not, see <http://www.gnu.org/licenses/>
+ * sdr-trunk
+ * Copyright (C) 2014-2018 Dennis Sheirer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by  the Free Software Foundation, either version 3 of the License, or  (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful,  but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License  along with this program.
+ * If not, see <http://www.gnu.org/licenses/>
+ *
  ******************************************************************************/
 package io.github.dsheirer.module.decode;
 
@@ -25,37 +23,28 @@ import java.util.EnumSet;
  */
 public enum DecoderType
 {
-	ACARS( "ACARS", "ACARS", "images/acars.png", 12500 ),
-	AIS( "AIS", "AIS", "images/ais.png", 12500 ),
-    AM( "AM", "AM", "images/am.png", 10000 ),
-    APRS( "APRS", "APRS", "images/aprs.png", 12500 ),
-    DMR( "DMR", "DMR", "images/dmr.png", 12500 ),
-    FLEETSYNC2( "Fleetsync II", "Fleetsync2", "images/fm.png", 12500 ),
-    LJ_1200( "LJ1200 173.075", "LJ1200", "images/lj1200.png", 12500 ),
-    LTR_STANDARD( "LTR-Standard", "LTR", "images/ltr.png", 10000 ),
-    LTR_NET( "LTR-Net", "LTR-Net", "images/ltr_net.png", 12500 ),
-    MDC1200( "MDC1200", "MDC1200", "images/fm.png", 12500 ),
-    MOTOROLA_TYPE_2( "MOTO T2", "MOTO T2", "images/motorola_type_2.png", 15000 ),
-    MPT1327( "MPT1327", "MPT1327", "images/mpt1327.png", 12500 ),
-    NXDN( "NXDN", "NXDN", "images/nxdn.png", 8000 ),
-    NBFM( "NBFM", "NBFM", "images/fm.png", 12500 ),
-    PASSPORT( "Passport", "Passport", "images/passport.png", 12500 ),
-    P25_PHASE1( "P25 Phase I", "P25-1", "images/p25_1.png", 12500 ),
-    P25_PHASE2( "P25 Phase II", "P25-2", "images/p25_2.png", 15000 ),
-    TAIT_1200( "Tait 1200", "Tait 1200", "images/tait.png", 12500 );
-    
+    //Primary Decoders
+    AM("AM", "AM"),
+    LTR_STANDARD("LTR-Standard", "LTR"),
+    LTR_NET("LTR-Net", "LTR-Net"),
+    MPT1327("MPT1327", "MPT1327"),
+    NBFM("NBFM", "NBFM"),
+    PASSPORT("Passport", "Passport"),
+    P25_PHASE1("P25 Phase I", "P25-1"),
+
+    //Auxiliary Decoders
+    FLEETSYNC2("Fleetsync II", "Fleetsync2"),
+    LJ_1200("LJ1200 173.075", "LJ1200"),
+    MDC1200("MDC1200", "MDC1200"),
+    TAIT_1200("Tait 1200", "Tait 1200");
+
     private String mDisplayString;
     private String mShortDisplayString;
-    private String mIconFilename;
-    private int mChannelBandwidth;
-    
-    DecoderType( String displayString, String shortDisplayString, 
-    			 String iconFilename, int bandwidth )
+
+    DecoderType(String displayString, String shortDisplayString)
     {
         mDisplayString = displayString;
         mShortDisplayString = shortDisplayString;
-        mIconFilename = iconFilename;
-        mChannelBandwidth = bandwidth;
     }
 
     /**
@@ -63,68 +52,43 @@ public enum DecoderType
      */
     public static EnumSet<DecoderType> getPrimaryDecoders()
     {
-    	return EnumSet.of( DecoderType.AM,
-    	                   DecoderType.LTR_NET,
-    					   DecoderType.LTR_STANDARD,
-    					   DecoderType.MPT1327,
-    					   DecoderType.NBFM,
-    					   DecoderType.P25_PHASE1,
-    					   DecoderType.PASSPORT );
+        return EnumSet.of(DecoderType.AM,
+            DecoderType.LTR_NET,
+            DecoderType.LTR_STANDARD,
+            DecoderType.MPT1327,
+            DecoderType.NBFM,
+            DecoderType.P25_PHASE1,
+            DecoderType.PASSPORT);
     }
 
-    /**
-     * Decoders that can be used in the viewer application
-     */
-    public static EnumSet<DecoderType> getInstrumentableDecoders()
-    {
-    	return EnumSet.of( DecoderType.FLEETSYNC2,
-    				 	   DecoderType.LJ_1200,
-    	                   DecoderType.LTR_NET,
-    					   DecoderType.MDC1200,
-    					   DecoderType.MPT1327,
-    					   DecoderType.PASSPORT,
-    					   DecoderType.P25_PHASE1,
-    					   DecoderType.TAIT_1200 );
-    }
-    
     /**
      * Available auxiliary decoders.
      */
     public static ArrayList<DecoderType> getAuxDecoders()
     {
-    	ArrayList<DecoderType> decoders = new ArrayList<DecoderType>();
-    	
-    	decoders.add( DecoderType.FLEETSYNC2 );
-    	decoders.add( DecoderType.LJ_1200 );
-    	decoders.add( DecoderType.MDC1200 );
-    	decoders.add( DecoderType.TAIT_1200 );
-    	
-    	return decoders;
+        ArrayList<DecoderType> decoders = new ArrayList<DecoderType>();
+
+        decoders.add(DecoderType.FLEETSYNC2);
+        decoders.add(DecoderType.LJ_1200);
+        decoders.add(DecoderType.MDC1200);
+        decoders.add(DecoderType.TAIT_1200);
+
+        return decoders;
     }
-    
+
     public String getDisplayString()
     {
         return mDisplayString;
     }
-    
+
     public String getShortDisplayString()
     {
-    	return mShortDisplayString;
+        return mShortDisplayString;
     }
-    
-    public String getIconFilename()
-    {
-    	return mIconFilename;
-    }
-    
-    public int getChannelBandwidth()
-    {
-    	return mChannelBandwidth;
-    }
-    
+
     @Override
     public String toString()
     {
-    	return mDisplayString;
+        return mDisplayString;
     }
 }

src/main/java/io/github/dsheirer/module/decode/afsk/AbstractAFSKDecoder.java

@@ -19,7 +19,7 @@ import io.github.dsheirer.dsp.afsk.AFSK1200Decoder;
 import io.github.dsheirer.module.decode.Decoder;
 import io.github.dsheirer.sample.Listener;
 import io.github.dsheirer.sample.buffer.IReusableBufferListener;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 
 /**
  * Abstract class for Audio Frequency Shift Keying (AFSK) 1200-baud decoder based decoder modules.
@@ -28,7 +28,7 @@ import io.github.dsheirer.sample.buffer.ReusableBuffer;
  *
  * Sub-class implementations should invoke getDecoder().setListener() to receive decoded symbol stream.
  */
-public abstract class AbstractAFSKDecoder extends Decoder implements IReusableBufferListener, Listener<ReusableBuffer>
+public abstract class AbstractAFSKDecoder extends Decoder implements IReusableBufferListener, Listener<ReusableFloatBuffer>
 {
     private AFSK1200Decoder mAFSK1200Decoder;
 
@@ -48,13 +48,13 @@ public abstract class AbstractAFSKDecoder extends Decoder implements IReusableBu
     }
 
     @Override
-    public void receive(ReusableBuffer reusableBuffer)
+    public void receive(ReusableFloatBuffer reusableFloatBuffer)
     {
-        mAFSK1200Decoder.receive(reusableBuffer);
+        mAFSK1200Decoder.receive(reusableFloatBuffer);
     }
 
     @Override
-    public Listener<ReusableBuffer> getReusableBufferListener()
+    public Listener<ReusableFloatBuffer> getReusableBufferListener()
     {
         return this;
     }

src/main/java/io/github/dsheirer/module/decode/am/DecodeConfigAM.java

@@ -17,9 +17,11 @@
  ******************************************************************************/
 package io.github.dsheirer.module.decode.am;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlProperty;
 import io.github.dsheirer.module.decode.DecoderType;
 import io.github.dsheirer.module.decode.config.DecodeConfiguration;
+import io.github.dsheirer.source.tuner.channel.ChannelSpecification;
 
 public class DecodeConfigAM extends DecodeConfiguration
 {
@@ -27,6 +29,17 @@ public class DecodeConfigAM extends DecodeConfiguration
     {
     }
 
+    /**
+     * Source channel specification for this decoder
+     */
+    @JsonIgnore
+    @Override
+    public ChannelSpecification getChannelSpecification()
+    {
+        return new ChannelSpecification(25000.0,
+            3000, 3000.0, 5000.0);
+    }
+
     @JacksonXmlProperty(isAttribute = true, localName = "type", namespace = "http://www.w3.org/2001/XMLSchema-instance")
     public DecoderType getDecoderType()
     {

src/main/java/io/github/dsheirer/module/decode/config/DecodeConfiguration.java

@@ -29,6 +29,7 @@ import io.github.dsheirer.module.decode.mpt1327.DecodeConfigMPT1327;
 import io.github.dsheirer.module.decode.nbfm.DecodeConfigNBFM;
 import io.github.dsheirer.module.decode.p25.DecodeConfigP25Phase1;
 import io.github.dsheirer.module.decode.passport.DecodeConfigPassport;
+import io.github.dsheirer.source.tuner.channel.ChannelSpecification;
 
 @JsonIgnoreProperties(ignoreUnknown = true)
 @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "type")
@@ -58,4 +59,7 @@ public abstract class DecodeConfiguration extends Configuration
 
     @JsonIgnore
     public abstract DecoderType getDecoderType();
+
+    @JsonIgnore
+    public abstract ChannelSpecification getChannelSpecification();
 }

src/main/java/io/github/dsheirer/module/decode/event/MessageActivityPanel.java

@@ -30,10 +30,17 @@ import net.miginfocom.swing.MigLayout;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import javax.swing.*;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JScrollPane;
+import javax.swing.JSlider;
+import javax.swing.JTable;
+import javax.swing.SwingUtilities;
 import javax.swing.event.ChangeEvent;
 import javax.swing.event.ChangeListener;
-import java.awt.*;
+import java.awt.EventQueue;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.awt.event.MouseEvent;
@@ -86,64 +93,6 @@ public class MessageActivityPanel extends JPanel implements Listener<ProcessingC
         });
     }
 
-    //    @Override
-//    public void channelChanged(ChannelEvent event)
-//    {
-//        boolean changed = false;
-//
-//        if(event.getEvent() == Event.NOTIFICATION_SELECTION_CHANGE &&
-//            event.getChannel().isSelected())
-//        {
-//            if(mDisplayedChannel == null || (mDisplayedChannel != null && mDisplayedChannel != event.getChannel()))
-//            {
-//                mDisplayedChannel = event.getChannel();
-//
-//                ProcessingChain chain = mChannelProcessingManager.getProcessingChain(mDisplayedChannel);
-//
-//                if(chain != null)
-//                {
-//                    mDisplayedModel = chain.getMessageActivityModel();
-//                }
-//                else
-//                {
-//                    mDisplayedModel = EMPTY_MODEL;
-//                }
-//
-//                mMessageTable.setModel(mDisplayedModel);
-//
-//                if(mDisplayedChannel != null)
-//                {
-//                    mManagementPanel.enableButtons();
-//                }
-//                else
-//                {
-//                    mManagementPanel.disableButtons();
-//                }
-//
-//                changed = true;
-//            }
-//        }
-//        else if(event.getEvent() == Event.NOTIFICATION_PROCESSING_STOP || event.getEvent() == Event.REQUEST_DISABLE)
-//        {
-//            if(mDisplayedChannel != null && mDisplayedChannel == event.getChannel())
-//            {
-//                mDisplayedChannel = null;
-//
-//                mMessageTable.setModel(EMPTY_MODEL);
-//
-//                mManagementPanel.disableButtons();
-//
-//                changed = true;
-//            }
-//        }
-//
-//        if(changed)
-//        {
-//            revalidate();
-//            repaint();
-//        }
-//    }
-
     public class MessageManagementPanel extends JPanel
     {
         private static final long serialVersionUID = 1L;

src/main/java/io/github/dsheirer/module/decode/fleetsync2/Fleetsync2DecoderInstrumented.java

@@ -17,7 +17,7 @@ package io.github.dsheirer.module.decode.fleetsync2;
 
 import io.github.dsheirer.dsp.afsk.AFSK1200DecoderInstrumented;
 import io.github.dsheirer.gui.instrument.chart.IInstrumentedAFSK1200Decoder;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import javafx.beans.property.SimpleIntegerProperty;
 
 /**
@@ -44,9 +44,9 @@ public class Fleetsync2DecoderInstrumented extends Fleetsync2Decoder implements
     }
 
     @Override
-    public void receive(ReusableBuffer reusableBuffer)
+    public void receive(ReusableFloatBuffer reusableFloatBuffer)
     {
-        super.receive(reusableBuffer);
+        super.receive(reusableFloatBuffer);
 
         bufferCount.setValue(bufferCount.intValue() + 1);
     }

src/main/java/io/github/dsheirer/module/decode/lj1200/LJ1200DecoderInstrumented.java

@@ -17,7 +17,7 @@ package io.github.dsheirer.module.decode.lj1200;
 
 import io.github.dsheirer.dsp.afsk.AFSK1200DecoderInstrumented;
 import io.github.dsheirer.gui.instrument.chart.IInstrumentedAFSK1200Decoder;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import javafx.beans.property.SimpleIntegerProperty;
 
 /**
@@ -44,9 +44,9 @@ public class LJ1200DecoderInstrumented extends LJ1200Decoder implements IInstrum
     }
 
     @Override
-    public void receive(ReusableBuffer reusableBuffer)
+    public void receive(ReusableFloatBuffer reusableFloatBuffer)
     {
-        super.receive(reusableBuffer);
+        super.receive(reusableFloatBuffer);
 
         bufferCount.setValue(bufferCount.intValue() + 1);
     }

src/main/java/io/github/dsheirer/module/decode/ltrnet/DecodeConfigLTRNet.java

@@ -17,10 +17,12 @@
  ******************************************************************************/
 package io.github.dsheirer.module.decode.ltrnet;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlProperty;
 import io.github.dsheirer.message.MessageDirection;
 import io.github.dsheirer.module.decode.DecoderType;
 import io.github.dsheirer.module.decode.config.DecodeConfiguration;
+import io.github.dsheirer.source.tuner.channel.ChannelSpecification;
 
 public class DecodeConfigLTRNet extends DecodeConfiguration
 {
@@ -46,4 +48,15 @@ public class DecodeConfigLTRNet extends DecodeConfiguration
     {
         mMessageDirection = direction;
     }
+
+    /**
+     * Source channel specification for this decoder
+     */
+    @JsonIgnore
+    @Override
+    public ChannelSpecification getChannelSpecification()
+    {
+        return new ChannelSpecification(25000.0,
+            12500, 6000.0, 7000.0);
+    }
 }

src/main/java/io/github/dsheirer/module/decode/ltrnet/LTRNetDecoder.java

@@ -24,9 +24,9 @@ import io.github.dsheirer.module.decode.Decoder;
 import io.github.dsheirer.module.decode.DecoderType;
 import io.github.dsheirer.sample.Listener;
 import io.github.dsheirer.sample.buffer.IReusableBufferListener;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 
-public class LTRNetDecoder extends Decoder implements IReusableBufferListener, Listener<ReusableBuffer>
+public class LTRNetDecoder extends Decoder implements IReusableBufferListener, Listener<ReusableFloatBuffer>
 {
     public static final int LTR_NET_MESSAGE_LENGTH = 40;
     protected LTRDecoder mLTRDecoder;
@@ -73,15 +73,15 @@ public class LTRNetDecoder extends Decoder implements IReusableBufferListener, L
     }
 
     @Override
-    public Listener<ReusableBuffer> getReusableBufferListener()
+    public Listener<ReusableFloatBuffer> getReusableBufferListener()
     {
         return mLTRDecoder;
     }
 
     @Override
-    public void receive(ReusableBuffer reusableBuffer)
+    public void receive(ReusableFloatBuffer reusableFloatBuffer)
     {
-        mLTRDecoder.receive(reusableBuffer);
+        mLTRDecoder.receive(reusableFloatBuffer);
     }
 
     @Override

src/main/java/io/github/dsheirer/module/decode/ltrnet/LTRNetDecoderInstrumented.java

@@ -17,7 +17,7 @@ package io.github.dsheirer.module.decode.ltrnet;
 
 import io.github.dsheirer.alias.AliasList;
 import io.github.dsheirer.dsp.fsk.LTRDecoderInstrumented;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import javafx.beans.property.SimpleIntegerProperty;
 
 public class LTRNetDecoderInstrumented extends LTRNetDecoder
@@ -35,9 +35,9 @@ public class LTRNetDecoderInstrumented extends LTRNetDecoder
     }
 
     @Override
-    public void receive(ReusableBuffer reusableBuffer)
+    public void receive(ReusableFloatBuffer reusableFloatBuffer)
     {
-        super.receive(reusableBuffer);
+        super.receive(reusableFloatBuffer);
 
         bufferCount.setValue(bufferCount.intValue() + 1);
     }

src/main/java/io/github/dsheirer/module/decode/ltrstandard/DecodeConfigLTRStandard.java

@@ -17,10 +17,12 @@
  ******************************************************************************/
 package io.github.dsheirer.module.decode.ltrstandard;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlProperty;
 import io.github.dsheirer.message.MessageDirection;
 import io.github.dsheirer.module.decode.DecoderType;
 import io.github.dsheirer.module.decode.config.DecodeConfiguration;
+import io.github.dsheirer.source.tuner.channel.ChannelSpecification;
 
 public class DecodeConfigLTRStandard extends DecodeConfiguration
 {
@@ -47,4 +49,15 @@ public class DecodeConfigLTRStandard extends DecodeConfiguration
     {
         mMessageDirection = direction;
     }
+
+    /**
+     * Source channel specification for this decoder
+     */
+    @JsonIgnore
+    @Override
+    public ChannelSpecification getChannelSpecification()
+    {
+        return new ChannelSpecification(25000.0,
+            12500, 6000.0, 7000.0);
+    }
 }

src/main/java/io/github/dsheirer/module/decode/ltrstandard/LTRStandardDecoder.java

@@ -24,9 +24,9 @@ import io.github.dsheirer.module.decode.Decoder;
 import io.github.dsheirer.module.decode.DecoderType;
 import io.github.dsheirer.sample.Listener;
 import io.github.dsheirer.sample.buffer.IReusableBufferListener;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 
-public class LTRStandardDecoder extends Decoder implements IReusableBufferListener, Listener<ReusableBuffer>
+public class LTRStandardDecoder extends Decoder implements IReusableBufferListener, Listener<ReusableFloatBuffer>
 {
     public static final int LTR_STANDARD_MESSAGE_LENGTH = 40;
 
@@ -65,15 +65,15 @@ public class LTRStandardDecoder extends Decoder implements IReusableBufferListen
     }
 
     @Override
-    public Listener<ReusableBuffer> getReusableBufferListener()
+    public Listener<ReusableFloatBuffer> getReusableBufferListener()
     {
         return mLTRDecoder;
     }
 
     @Override
-    public void receive(ReusableBuffer reusableBuffer)
+    public void receive(ReusableFloatBuffer reusableFloatBuffer)
     {
-        mLTRDecoder.receive(reusableBuffer);
+        mLTRDecoder.receive(reusableFloatBuffer);
     }
 
     @Override

src/main/java/io/github/dsheirer/module/decode/mdc1200/MDCDecoderInstrumented.java

@@ -17,7 +17,7 @@ package io.github.dsheirer.module.decode.mdc1200;
 
 import io.github.dsheirer.dsp.afsk.AFSK1200DecoderInstrumented;
 import io.github.dsheirer.gui.instrument.chart.IInstrumentedAFSK1200Decoder;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import javafx.beans.property.SimpleIntegerProperty;
 
 /**
@@ -44,9 +44,9 @@ public class MDCDecoderInstrumented extends MDCDecoder implements IInstrumentedA
     }
 
     @Override
-    public void receive(ReusableBuffer reusableBuffer)
+    public void receive(ReusableFloatBuffer reusableFloatBuffer)
     {
-        super.receive(reusableBuffer);
+        super.receive(reusableFloatBuffer);
 
         bufferCount.setValue(bufferCount.intValue() + 1);
     }

src/main/java/io/github/dsheirer/module/decode/mpt1327/DecodeConfigMPT1327.java

@@ -17,9 +17,11 @@
  ******************************************************************************/
 package io.github.dsheirer.module.decode.mpt1327;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlProperty;
 import io.github.dsheirer.module.decode.DecoderType;
 import io.github.dsheirer.module.decode.config.DecodeConfiguration;
+import io.github.dsheirer.source.tuner.channel.ChannelSpecification;
 
 public class DecodeConfigMPT1327 extends DecodeConfiguration
 {
@@ -102,4 +104,15 @@ public class DecodeConfigMPT1327 extends DecodeConfiguration
     {
         mTrafficChannelPoolSize = size;
     }
+
+    /**
+     * Source channel specification for this decoder
+     */
+    @JsonIgnore
+    @Override
+    public ChannelSpecification getChannelSpecification()
+    {
+        return new ChannelSpecification(25000.0,
+            12500, 6000.0, 7000.0);
+    }
 }

src/main/java/io/github/dsheirer/module/decode/mpt1327/MPT1327DecoderInstrumented.java

@@ -17,7 +17,7 @@ package io.github.dsheirer.module.decode.mpt1327;
 
 import io.github.dsheirer.dsp.afsk.AFSK1200DecoderInstrumented;
 import io.github.dsheirer.gui.instrument.chart.IInstrumentedAFSK1200Decoder;
-import io.github.dsheirer.sample.buffer.ReusableBuffer;
+import io.github.dsheirer.sample.buffer.ReusableFloatBuffer;
 import javafx.beans.property.SimpleIntegerProperty;
 
 /**
@@ -44,9 +44,9 @@ public class MPT1327DecoderInstrumented extends MPT1327Decoder implements IInstr
     }
 
     @Override
-    public void receive(ReusableBuffer reusableBuffer)
+    public void receive(ReusableFloatBuffer reusableFloatBuffer)
     {
-        super.receive(reusableBuffer);
+        super.receive(reusableFloatBuffer);
 
         bufferCount.setValue(bufferCount.intValue() + 1);
     }