@Override
public List<Tap> getTaps() {
if (mAvailableTaps == null) {
mAvailableTaps = new ArrayList<Tap>();
if (mSourceSampleType == SampleType.COMPLEX) {
if (mCQPSKDemodulator != null) {
mAvailableTaps.addAll(mCQPSKDemodulator.getTaps());
}
// mAvailableTaps.add( new ComplexTap( INSTRUMENT_COMPLEX_INPUT, 0, 1.0f ) );
// mAvailableTaps.add( new ComplexTap( INSTRUMENT_BASEBAND_FILTER_OUTPUT, 0, 1.0f ) );
} else {
mAvailableTaps.add(new FloatTap(INSTRUMENT_REAL_INPUT, 0, 1.0f));
}
if (mModulation == Modulation.C4FM) {
mAvailableTaps.add(new FloatTap(INSTRUMENT_DGC_OUTPUT, 0, 1.0f));
mAvailableTaps.add(new FloatTap(INSTRUMENT_C4FM_SYMBOL_FILTER_OUTPUT, 0, 0.1f));
mAvailableTaps.add(new DibitTap(INSTRUMENT_C4FM_SLICER_OUTPUT, 0, 0.1f));
if (mSymbolFilter != null) {
mAvailableTaps.addAll(mSymbolFilter.getTaps());
}
} else {
mAvailableTaps.add(new ComplexTap(INSTRUMENT_AGC_OUTPUT, 0, 1.0f));
mAvailableTaps.add(new QPSKTap(INSTRUMENT_QPSK_DEMODULATOR_OUTPUT, 0, 1.0f));
mAvailableTaps.add(new DibitTap(INSTRUMENT_CQPSK_SLICER_OUTPUT, 0, 0.1f));
}
}
return mAvailableTaps;
}
@Override
public void removeTap(Tap tap) {
if (mSymbolFilter != null) {
mSymbolFilter.removeTap(tap);
}
if (mCQPSKDemodulator != null) {
mCQPSKDemodulator.removeTap(tap);
}
switch (tap.getName()) {
case INSTRUMENT_COMPLEX_INPUT:
removeComplexListener((ComplexTap) tap);
break;
case INSTRUMENT_BASEBAND_FILTER_OUTPUT:
mBasebandFilter.setListener(mAGC);
break;
case INSTRUMENT_AGC_OUTPUT:
mAGC.setListener(mCQPSKDemodulator);
break;
case INSTRUMENT_QPSK_DEMODULATOR_OUTPUT:
mCQPSKDemodulator.setListener(mCQPSKSlicer);
break;
case INSTRUMENT_CQPSK_SLICER_OUTPUT:
mCQPSKSlicer.removeListener((DibitTap) tap);
break;
case INSTRUMENT_REAL_INPUT:
FloatTap inputAGC = (FloatTap) tap;
removeRealListener(inputAGC);
addRealSampleListener(mDGC);
break;
case INSTRUMENT_DGC_OUTPUT:
mDGC.setListener(mSymbolFilter);
break;
case INSTRUMENT_C4FM_SYMBOL_FILTER_OUTPUT:
mSymbolFilter.setListener(mC4FMSlicer);
break;
case INSTRUMENT_C4FM_SLICER_OUTPUT:
DibitTap slicerTap = (DibitTap) tap;
if (mC4FMSlicer != null) {
mC4FMSlicer.removeListener(slicerTap);
}
break;
}
}
@Override
public void addTap(Tap tap) {
if (mSymbolFilter != null) {
mSymbolFilter.addTap(tap);
}
if (mCQPSKDemodulator != null) {
mCQPSKDemodulator.addTap(tap);
}
switch (tap.getName()) {
case INSTRUMENT_COMPLEX_INPUT:
addComplexListener((ComplexTap) tap);
break;
case INSTRUMENT_BASEBAND_FILTER_OUTPUT:
ComplexTap baseband = (ComplexTap) tap;
mBasebandFilter.setListener(baseband);
baseband.setListener(mAGC);
break;
case INSTRUMENT_AGC_OUTPUT:
ComplexTap agcSymbol = (ComplexTap) tap;
mAGC.setListener(agcSymbol);
agcSymbol.setListener(mCQPSKDemodulator);
break;
case INSTRUMENT_QPSK_DEMODULATOR_OUTPUT:
QPSKTap qpsk = (QPSKTap) tap;
mCQPSKDemodulator.setListener(qpsk);
qpsk.setListener(mCQPSKSlicer);
break;
case INSTRUMENT_CQPSK_SLICER_OUTPUT:
mCQPSKSlicer.addListener((DibitTap) tap);
break;
case INSTRUMENT_REAL_INPUT:
FloatTap inputAGC = (FloatTap) tap;
removeRealListener(mDGC);
addRealSampleListener(inputAGC);
inputAGC.setListener(mDGC);
break;
case INSTRUMENT_DGC_OUTPUT:
FloatTap dgcSymbol = (FloatTap) tap;
mDGC.setListener(dgcSymbol);
dgcSymbol.setListener(mSymbolFilter);
break;
case INSTRUMENT_C4FM_SYMBOL_FILTER_OUTPUT:
FloatTap symbolSlicer = (FloatTap) tap;
mSymbolFilter.setListener(symbolSlicer);
symbolSlicer.setListener(mC4FMSlicer);
break;
case INSTRUMENT_C4FM_SLICER_OUTPUT:
DibitTap slicer = (DibitTap) tap;
if (mC4FMSlicer != null) {
mC4FMSlicer.addListener(slicer);
}
if (mCQPSKSlicer != null) {
mCQPSKSlicer.addListener(slicer);
}
break;
}
}
public P25Decoder(
ResourceManager resourceManager,
SampleType sampleType,
Modulation modulation,
AliasList aliasList) {
super(sampleType);
mModulation = modulation;
mAliasList = aliasList;
mMessageProcessor = new P25MessageProcessor(mAliasList);
mMessageProcessor.addMessageListener(this);
if (modulation == Modulation.CQPSK) {
/* Provide message framer with reference to the demod so that it
* can detect and issue corrections for costas phase lock errors */
mCQPSKDemodulator = new CQPSKDemodulator();
mMessageFramer = new P25MessageFramer(mAliasList, mCQPSKDemodulator);
} else {
mMessageFramer = new P25MessageFramer(mAliasList);
}
mMessageFramer.setListener(mMessageProcessor);
/* Setup demodulation chains based on sample type (real or complex) and
* modulation (C4FM or CQPSK) */
if (mSourceSampleType == SampleType.COMPLEX) {
if (modulation == Modulation.CQPSK) {
mBasebandFilter =
new ComplexFIRFilter(
FilterFactory.getLowPass(48000, 7250, 8000, 60, WindowType.HANNING, true), 1.0);
this.addComplexListener(mBasebandFilter);
// mEqualizer = new CMAEqualizer( 1.0f, 0.005f );
// mBasebandFilter.setListener( mEqualizer );
mAGC = new ComplexFeedForwardGainControl(32);
// mEqualizer.setListener( mAGC );
mBasebandFilter.setListener(mAGC);
mAGC.setListener(mCQPSKDemodulator);
mCQPSKSlicer = new QPSKPolarSlicer();
mCQPSKDemodulator.setListener(mCQPSKSlicer);
mCQPSKSlicer.addListener(mMessageFramer);
} else /* C4FM */ {
mBasebandFilter =
new ComplexFIRFilter(
FilterFactory.getLowPass(48000, 6750, 7500, 60, WindowType.HANNING, true), 1.0);
this.addComplexListener(mBasebandFilter);
mFMDemodulator = new FMDiscriminator(1.0f);
mBasebandFilter.setListener(mFMDemodulator);
/* Route output of the FM demod back to this channel so that we
* can process the output as if it were coming from any other
* real sample source */
mFMDemodulator.setListener(getRealReceiver());
}
}
/* Processing chain for real samples & demodulated complex samples */
if (modulation == Modulation.C4FM) {
mAudioFilter =
new FloatFIRFilter(
FilterFactory.getLowPass(48000, 3000, 4000, 48, WindowType.HAMMING, true), 1.0);
addRealSampleListener(mAudioFilter);
mDGC = new DirectGainControl(15.0f, 0.1f, 35.0f, 0.3f);
mAudioFilter.setListener(mDGC);
mFrequencyCorrection = new FrequencyCorrectionControl(MAXIMUM_FREQUENCY_CORRECTION);
mSymbolFilter = new C4FMSymbolFilter(mDGC, mFrequencyCorrection);
mDGC.setListener(mSymbolFilter);
mC4FMSlicer = new C4FMSlicer();
mSymbolFilter.setListener(mC4FMSlicer);
mC4FMSlicer.addListener(mMessageFramer);
}
mAudioOutput = new P25AudioOutput(resourceManager);
mMessageProcessor.addMessageListener(mAudioOutput);
}