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SSB Modulator: use sine/cosine ramp to smooth out CW transitions
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@ -52,7 +52,12 @@ SSBMod::SSBMod(BasebandSampleSink* sampleSink) :
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m_afInput(SSBModInputNone),
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m_levelCalcCount(0),
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m_peakLevel(0.0f),
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m_levelSum(0.0f)
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m_levelSum(0.0f),
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m_fadeInCounter(0),
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m_fadeOutCounter(0),
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m_nbFadeSamples(96),
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m_fadeInSamples(0),
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m_fadeOutSamples(0)
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{
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setObjectName("SSBMod");
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@ -93,6 +98,7 @@ SSBMod::SSBMod(BasebandSampleSink* sampleSink) :
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m_cwKeyer.setWPM(13);
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m_cwKeyer.setMode(CWKeyer::CWNone);
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makeFadeSamples();
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apply();
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}
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@ -114,6 +120,9 @@ SSBMod::~SSBMod()
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delete m_DSBFilterBuffer;
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}
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delete[] m_fadeInSamples;
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delete[] m_fadeOutSamples;
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DSPEngine::instance()->removeAudioSource(&m_audioFifo);
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}
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@ -301,20 +310,58 @@ void SSBMod::pullAF(Complex& sample)
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break;
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case SSBModInputCWTone:
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Real fadeFactor;
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if (m_cwKeyer.getSample())
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{
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m_fadeOutCounter = 0;
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if (m_fadeInCounter < m_nbFadeSamples)
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{
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fadeFactor = m_fadeInSamples[m_fadeInCounter];
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m_fadeInCounter++;
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}
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else
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{
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fadeFactor = 1.0f;
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}
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if (m_running.m_dsb)
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{
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Real t = m_toneNco.next();
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Real t = m_toneNco.next() * fadeFactor;
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sample.real(t);
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sample.imag(t);
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}
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else
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{
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if (m_running.m_usb) {
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sample = m_toneNco.nextIQ();
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sample = m_toneNco.nextIQ() * fadeFactor;
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} else {
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sample = m_toneNco.nextQI();
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sample = m_toneNco.nextQI() * fadeFactor;
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}
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}
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}
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else
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{
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m_fadeInCounter = 0;
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if (m_fadeOutCounter < m_nbFadeSamples)
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{
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fadeFactor = m_fadeOutSamples[m_fadeOutCounter];
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m_fadeOutCounter++;
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if (m_running.m_dsb)
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{
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Real t = m_toneNco.next() * fadeFactor;
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sample.real(t);
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sample.imag(t);
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}
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else
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{
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if (m_running.m_usb) {
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sample = m_toneNco.nextIQ() * fadeFactor;
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} else {
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sample = m_toneNco.nextQI() * fadeFactor;
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}
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}
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}
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@ -324,6 +371,8 @@ void SSBMod::pullAF(Complex& sample)
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sample.imag(0.0f);
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m_toneNco.setPhase(0);
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}
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}
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break;
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case SSBModInputNone:
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default:
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@ -453,6 +502,29 @@ void SSBMod::pullAF(Complex& sample)
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}
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}
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void SSBMod::makeFadeSamples()
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{
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if (m_fadeInSamples) {
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delete[] m_fadeInSamples;
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}
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if (m_fadeOutSamples) {
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delete[] m_fadeOutSamples;
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}
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m_fadeInSamples = new Real[m_nbFadeSamples];
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m_fadeOutSamples = new Real[m_nbFadeSamples];
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for (int i = 0; i < m_nbFadeSamples; i++)
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{
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m_fadeInSamples[i] = sin((i/ (Real) m_nbFadeSamples) * M_PI_2);
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m_fadeOutSamples[i] = cos((i/ (Real) m_nbFadeSamples) * M_PI_2);
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}
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m_fadeInCounter = 0;
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m_fadeOutCounter = 0;
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}
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void SSBMod::calculateLevel(Complex& sample)
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{
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Real t = sample.real(); // TODO: possibly adjust depending on sample type
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@ -646,7 +718,11 @@ void SSBMod::apply()
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if (m_config.m_audioSampleRate != m_running.m_audioSampleRate)
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{
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m_settingsMutex.lock();
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m_cwKeyer.setSampleRate(m_config.m_audioSampleRate);
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m_nbFadeSamples = m_config.m_audioSampleRate / 500; // 2ms
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makeFadeSamples();
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m_settingsMutex.unlock();
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}
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if (m_config.m_dsb != m_running.m_dsb)
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@ -383,6 +383,11 @@ private:
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Real m_peakLevel;
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Real m_levelSum;
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CWKeyer m_cwKeyer;
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int m_fadeInCounter;
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int m_fadeOutCounter;
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int m_nbFadeSamples;
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Real *m_fadeInSamples;
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Real *m_fadeOutSamples;
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static const int m_levelNbSamples;
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@ -390,6 +395,7 @@ private:
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void pullAF(Complex& sample);
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void calculateLevel(Complex& sample);
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void modulateSample();
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void makeFadeSamples();
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void openFileStream();
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void seekFileStream(int seekPercentage);
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};
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