mirror of
https://github.com/DSheirer/sdrtrunk.git
synced 2026-11-13 00:57:31 -05:00
Initial commit of redesigned internal processing and audio management.
Note: Several of the decoders are currently non-functioning in this commit. If you want the latest functioning codebase, please checkout the commit prior to this one. All decoders will eventually be updated with this new architecture. Currently broken: - Logging and recording - Aux decoders (Fleetsync/MDC/LoJack/Tait) - LTR/Passport decoders Changes in this commit: - Module architecture for decoders and components with central provisioning by the DecoderFactory - Transition from Complex sample stream processing to float buffer processing for improved memory management - Redesigned filter structures - to support buffers and streams - Resolved several memory leak issues - Universal sharing of the thread pool manager - Added centralized audio management with call/user prioritization and new gui with mute/volume controls - Embedded audio metadata for eventual streaming support - Redesigned ProcessingChain to support independent re-use - Added new TrafficChannelManager to handle traffic channel allocations - Traffic Channel pool size and Call timeout available in P25 and MPT1327 configs - Redesigned channel and decoder gui components
This commit is contained in:
denny
78
src/dsp/fm/FMDemodulator.java
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78
src/dsp/fm/FMDemodulator.java
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/*******************************************************************************
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* SDR Trunk
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* Copyright (C) 2014,2015 Dennis Sheirer
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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******************************************************************************/
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package dsp.fm;
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public abstract class FMDemodulator
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{
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private float mPreviousI = 0.0f;
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private float mPreviousQ = 0.0f;
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protected float mGain;
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public FMDemodulator( float gain )
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{
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mGain = gain;
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}
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public float demodulate( float currentI, float currentQ )
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{
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/**
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* Multiply the current sample against the complex conjugate of the
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* previous sample to derive the phase delta between the two samples
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*
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* Negating the previous sample quadrature produces the conjugate
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*/
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double inphase = ( currentI * mPreviousI ) - ( currentQ * -mPreviousQ );
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double quadrature = ( currentQ * mPreviousI ) + ( currentI * -mPreviousQ );
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double angle = 0.0f;
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//Check for divide by zero
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if( inphase != 0 )
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{
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/**
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* Use the arc-tangent of quadrature divided by inphase to
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* get the phase angle (+/-) which was directly manipulated by the
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* original message waveform during the modulation. This value now
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* serves as the instantaneous amplitude of the demodulated signal
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*/
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double denominator = 1.0d / inphase;
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angle = Math.atan( (double)quadrature * denominator );
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}
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/**
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* Store the current sample to use during the next iteration
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*/
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mPreviousI = currentI;
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mPreviousQ = currentQ;
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return (float)( angle * mGain );
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}
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public abstract void dispose();
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public void reset()
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{
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mPreviousI = 0.0f;
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mPreviousQ = 0.0f;
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}
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public void setGain( float gain )
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{
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mGain = gain;
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}
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}
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81
src/dsp/fm/FMDemodulator_CB.java
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81
src/dsp/fm/FMDemodulator_CB.java
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@@ -0,0 +1,81 @@
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/*******************************************************************************
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* SDR Trunk
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* Copyright (C) 2014,2015 Dennis Sheirer
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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******************************************************************************/
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package dsp.fm;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import record.wave.ComplexWaveRecorder;
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import sample.Listener;
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import sample.complex.ComplexBuffer;
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import sample.real.RateCounter_RB;
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import sample.real.RealBuffer;
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public class FMDemodulator_CB extends FMDemodulator implements Listener<ComplexBuffer>
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{
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private final static Logger mLog =
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LoggerFactory.getLogger( FMDemodulator_CB.class );
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private Listener<RealBuffer> mListener;
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private RateCounter_RB mRateCounter = new RateCounter_RB( "FM DEMOD OUTPUT" );
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public FMDemodulator_CB( float gain )
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{
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super( gain );
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}
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@Override
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public void receive( ComplexBuffer buffer )
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{
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if( mListener != null )
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{
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float[] samples = buffer.getSamples();
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int half = samples.length / 2;
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float[] demodulated = new float[ half ];
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for( int x = 0; x < half; x++ )
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{
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int index = x * 2;
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demodulated[ x ] = demodulate( samples[ index ],
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samples[ index + 1 ] );
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}
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mListener.receive( new RealBuffer( demodulated ) );
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}
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}
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public void setListener( Listener<RealBuffer> listener )
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{
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mListener = listener;
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}
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public void removeListener()
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{
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mListener = null;
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}
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@Override
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public void dispose()
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{
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mListener = null;
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}
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}
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102
src/dsp/fm/FMDiscriminator.java
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102
src/dsp/fm/FMDiscriminator.java
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@@ -0,0 +1,102 @@
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/*******************************************************************************
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* SDR Trunk
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* Copyright (C) 2014,2015 Dennis Sheirer
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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******************************************************************************/
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package dsp.fm;
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import sample.Listener;
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import sample.complex.Complex;
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import sample.real.RealSampleListener;
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@Deprecated
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public class FMDiscriminator implements Listener<Complex>
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{
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private RealSampleListener mListener;
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private Complex mPreviousSample = new Complex( 0.0f, 0.0f );
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private double mGain;
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/**
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* Implements a polar discriminator with ArcTangent angle estimator to
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* demodulate complex sampled frequency modulated signals.
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*
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* @param gain - gain to be applied to the demodulated output - can be
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* dynamically applied to continuously adjust audio output
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*/
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public FMDiscriminator( double gain )
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{
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mGain = gain;
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}
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public void dispose()
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{
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mListener = null;
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mPreviousSample = null;
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}
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public synchronized void setGain( double gain )
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{
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mGain = gain;
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}
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@Override
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public void receive( Complex currentSample )
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{
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/**
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* Multiply the current sample against the complex conjugate of the
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* previous sample to derive the phase delta between the two samples
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*
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* Negating the previous sample quadrature produces the conjugate
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*/
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double i = ( currentSample.inphase() * mPreviousSample.inphase() ) -
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( currentSample.quadrature() * -mPreviousSample.quadrature() );
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double q = ( currentSample.quadrature() * mPreviousSample.inphase() ) +
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( currentSample.inphase() * -mPreviousSample.quadrature() );
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double angle;
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//Check for divide by zero
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if( i == 0 )
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{
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angle = 0.0;
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}
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else
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{
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/**
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* Use the arc-tangent of imaginary (q) divided by real (i) to
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* get the phase angle (+/-) which was directly manipulated by the
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* original message waveform during the modulation. This value now
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* serves as the instantaneous amplitude of the demodulated signal
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*/
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double denominator = 1.0d / i;
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angle = Math.atan( (double)q * denominator );
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}
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if( mListener != null )
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{
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mListener.receive( (float)( angle * mGain ) );
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}
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/**
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* Store the current sample to use during the next iteration
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*/
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mPreviousSample = currentSample;
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}
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public void setListener( RealSampleListener listener )
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{
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mListener = listener;
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}
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}
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96
src/dsp/fm/FilteringNBFMDemodulator.java
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96
src/dsp/fm/FilteringNBFMDemodulator.java
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@@ -0,0 +1,96 @@
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/*******************************************************************************
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* SDR Trunk
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* Copyright (C) 2014 Dennis Sheirer
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
|
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* the Free Software Foundation, either version 3 of the License, or
|
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
|
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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******************************************************************************/
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package dsp.fm;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import sample.Listener;
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import sample.complex.Complex;
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import sample.real.RealSampleBroadcaster;
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import sample.real.RealSampleListener;
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import dsp.filter.ComplexFIRFilterOld;
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import dsp.filter.FilterFactory;
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import dsp.filter.FloatFIRFilter;
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import dsp.filter.Window.WindowType;
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@Deprecated
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public class FilteringNBFMDemodulator implements Listener<Complex>
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{
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private final static Logger mLog =
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LoggerFactory.getLogger( FilteringNBFMDemodulator.class );
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private RealSampleBroadcaster mBroadcaster = new RealSampleBroadcaster();
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private ComplexFIRFilterOld mIQFilter;
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private FloatFIRFilter mAudioFilter;
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private FMDiscriminator mDiscriminator;
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public FilteringNBFMDemodulator( float[] iqFilter, float iqGain,
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float[] audioFilter, float audioGain )
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{
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mIQFilter = new ComplexFIRFilterOld( iqFilter, iqGain );
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mAudioFilter = new FloatFIRFilter( audioFilter, audioGain );
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mDiscriminator = new FMDiscriminator( 1 );
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mIQFilter.setListener( mDiscriminator );
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mDiscriminator.setListener( mAudioFilter );
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mAudioFilter.setListener( mBroadcaster );
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}
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/**
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* Implements a quadrature narrow-band demodulator that produces float
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* valued demodulated, audio filtered output samples.
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*/
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public FilteringNBFMDemodulator()
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{
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this( FilterFactory.getLowPass( 48000, 5000, 7000, 48, WindowType.HAMMING, true ),
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1.0002f,
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FilterFactory.getLowPass( 48000, 3000, 6000, 48, WindowType.HAMMING, true ),
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2 );
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}
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/**
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* Receive method for complex samples that are fed into this class to be
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* processed
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*/
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@Override
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public void receive( Complex quadratureSample )
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{
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mIQFilter.receive( quadratureSample );
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}
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/**
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* Adds a listener to receive demodulated samples
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*/
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public void addListener( RealSampleListener listener )
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{
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mBroadcaster.addListener( listener );
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}
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/**
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* Removes a listener from receiving demodulated samples
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*/
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public void removeListener( RealSampleListener listener )
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{
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mBroadcaster.removeListener( listener );
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}
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}
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90
src/dsp/fm/NBFMDemodulator.java
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90
src/dsp/fm/NBFMDemodulator.java
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@@ -0,0 +1,90 @@
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/*******************************************************************************
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* SDR Trunk
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* Copyright (C) 2014 Dennis Sheirer
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*
|
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* 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/>
|
||||
******************************************************************************/
|
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package dsp.fm;
|
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import sample.Listener;
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import sample.complex.Complex;
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import sample.real.RealSampleBroadcaster;
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import sample.real.RealSampleListener;
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import dsp.filter.ComplexFIRFilterOld;
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import dsp.filter.FilterFactory;
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import dsp.filter.Window.WindowType;
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@Deprecated
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public class NBFMDemodulator implements Listener<Complex>
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{
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private RealSampleBroadcaster mBroadcaster = new RealSampleBroadcaster();
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private ComplexFIRFilterOld mIQFilter;
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private FMDiscriminator mDiscriminator;
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|
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/**
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* Implements a quadrature narrow-band demodulator that produces float
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* valued demodulated, audio filtered output samples.
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*/
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public NBFMDemodulator()
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{
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this( FilterFactory.getLowPass( 48000, 6250, 73, WindowType.HAMMING ),
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1.0002f, true );
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}
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public NBFMDemodulator( float[] iqFilter, float iqGain, boolean afc )
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{
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mIQFilter = new ComplexFIRFilterOld( iqFilter, iqGain );
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mDiscriminator = new FMDiscriminator( 1 );
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mIQFilter.setListener( mDiscriminator );
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mDiscriminator.setListener( mBroadcaster );
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}
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public void dispose()
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{
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mDiscriminator.dispose();
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mBroadcaster.dispose();
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mIQFilter.dispose();
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}
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|
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/**
|
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* Receive method for complex samples that are fed into this class to be
|
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* processed
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*/
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@Override
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public void receive( Complex sample )
|
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{
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mIQFilter.receive( sample );
|
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}
|
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|
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/**
|
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* Adds a listener to receive demodulated samples
|
||||
*/
|
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public void addListener( RealSampleListener listener )
|
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{
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mBroadcaster.addListener( listener );
|
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}
|
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|
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/**
|
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* Removes a listener from receiving demodulated samples
|
||||
*/
|
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public void removeListener( RealSampleListener listener )
|
||||
{
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mBroadcaster.removeListener( listener );
|
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}
|
||||
}
|
||||
Reference in New Issue
Block a user