Improved LTR FSK decoder for LTR, LTR-Net and Passport decoders. Added IIR DC blocking filter and used improved slicer from the FSK decoder.

Added instrumentation to Passport decoder and updated some of the instrumentation components.

src/buffer/BooleanAveragingBuffer.java

@@ -27,12 +27,12 @@ import java.util.Arrays;
  * 
  * Also provides averaging over the elements in the buffer
  */
-public class AveragingCircularBooleanBuffer {
+public class BooleanAveragingBuffer {
 
 	private boolean[] mBuffer;
 	private int mBufferPointer;
 	
-	public AveragingCircularBooleanBuffer( int length )
+	public BooleanAveragingBuffer( int length )
 	{
 		mBuffer = new boolean[ length ];
 		

src/buffer/DelayBuffer.java

@@ -0,0 +1,67 @@
+/*******************************************************************************
+ *     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/>
+ ******************************************************************************/
+package buffer;
+
+import sample.Listener;
+
+/**
+ * Delay Buffer - implements a circular delay buffer backed by an object array
+ */
+public class DelayBuffer<T> implements Listener<T>
+{
+	private Object[] mBuffer;
+	private int mBufferPointer = 0;
+	private Listener<T> mListener;
+	
+	public DelayBuffer( int length )
+	{
+		mBuffer = new Object[ length ];
+	}
+	
+    @Override
+	@SuppressWarnings( "unchecked" )
+    public void receive( T value )
+    {
+		Object delayed = mBuffer[ mBufferPointer ];
+		
+		mBuffer[ mBufferPointer ] = value;
+		
+		mBufferPointer++;
+
+		/* Wrap the buffer pointer around to 0 when necessary */
+		if( mBufferPointer >= mBuffer.length )
+		{
+			mBufferPointer = 0;
+		}
+
+		if( mListener != null && delayed != null )
+		{
+			mListener.receive( (T)delayed );
+		}
+    }
+	
+	public void setListener( Listener<T> listener )
+	{
+		mListener = listener;
+	}
+	
+	public void removeListener( Listener<T> listener )
+	{
+		mListener = null;
+	}
+}