Esempio n. 1
0
  @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;
    }
  }
Esempio n. 2
0
  @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;
    }
  }
Esempio n. 3
0
  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);
  }