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WFM Moduletor
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f4exb
parent
d09f0d2ede
commit
95a8eb9856
@ -249,8 +249,6 @@ void NFMMod::stop()
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bool NFMMod::handleMessage(const Message& cmd)
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{
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qDebug() << "NFMMod::handleMessage";
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if (UpChannelizer::MsgChannelizerNotification::match(cmd))
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{
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UpChannelizer::MsgChannelizerNotification& notif = (UpChannelizer::MsgChannelizerNotification&) cmd;
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@ -96,30 +96,23 @@ void WFMMod::configure(MessageQueue* messageQueue,
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void WFMMod::pull(Sample& sample)
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{
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Complex ci;
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Complex ci, ri;
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Real t;
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m_settingsMutex.lock();
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if (m_interpolatorDistance > 1.0f) // decimate
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if (m_interpolator.interpolate(&m_interpolatorDistanceRemain, m_modSample, &ri))
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{
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modulateSample();
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while (!m_interpolator.decimate(&m_interpolatorDistanceRemain, m_modSample, &ci))
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{
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modulateSample();
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}
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}
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else
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{
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if (m_interpolator.interpolate(&m_interpolatorDistanceRemain, m_modSample, &ci))
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{
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modulateSample();
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}
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pullAF(m_modSample);
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calculateLevel(m_modSample.real());
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}
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m_interpolatorDistanceRemain += m_interpolatorDistance;
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m_modPhasor += (m_running.m_fmDeviation / (float) m_running.m_outputSampleRate) * ri.real() * M_PI_2;
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ci.real(cos(m_modPhasor) * 32678.0f);
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ci.imag(sin(m_modPhasor) * 32678.0f);
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ci *= m_carrierNco.nextIQ(); // shift to carrier frequency
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m_settingsMutex.unlock();
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@ -133,27 +126,15 @@ void WFMMod::pull(Sample& sample)
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sample.m_imag = (FixReal) ci.imag();
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}
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void WFMMod::modulateSample()
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{
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Real t;
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pullAF(t);
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calculateLevel(t);
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// 378 = 302 * 1.25; 302 = number of filter taps (established experimentally)
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m_modPhasor += (m_running.m_fmDeviation / (float) m_running.m_audioSampleRate) * m_bandpass.filter(t) * (M_PI / 378.0f);
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m_modSample.real(cos(m_modPhasor) * 32678.0f);
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m_modSample.imag(sin(m_modPhasor) * 32678.0f);
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}
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void WFMMod::pullAF(Real& sample)
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void WFMMod::pullAF(Complex& sample)
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{
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int16_t audioSample[2];
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switch (m_afInput)
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{
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case WFMModInputTone:
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sample = m_toneNco.next();
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sample.real(m_toneNco.next());
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sample.imag(0.0f);
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break;
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case WFMModInputFile:
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// sox f4exb_call.wav --encoding float --endian little f4exb_call.raw
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@ -171,22 +152,32 @@ void WFMMod::pullAF(Real& sample)
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if (m_ifstream.eof())
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{
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sample = 0.0f;
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sample.real(0.0f);
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sample.imag(0.0f);
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}
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else
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{
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m_ifstream.read(reinterpret_cast<char*>(&sample), sizeof(Real));
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sample *= m_running.m_volumeFactor;
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Real s;
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m_ifstream.read(reinterpret_cast<char*>(&s), sizeof(Real));
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m_lowpass.filter(s);
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sample.real(s * m_running.m_volumeFactor);
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sample.imag(0.0f);
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}
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}
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else
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{
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sample = 0.0f;
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sample.real(0.0f);
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sample.imag(0.0f);
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}
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break;
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case WFMModInputAudio:
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{
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Real s = (audioSample[0] + audioSample[1]) / 65536.0f;
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m_lowpass.filter(s);
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m_audioFifo.read(reinterpret_cast<quint8*>(audioSample), 1, 10);
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sample = ((audioSample[0] + audioSample[1]) / 65536.0f) * m_running.m_volumeFactor;
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sample.real(s * m_running.m_volumeFactor);
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sample.imag(0.0f);
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}
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break;
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case WFMModInputCWTone:
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Real fadeFactor;
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@ -194,24 +185,28 @@ void WFMMod::pullAF(Real& sample)
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if (m_cwKeyer.getSample())
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{
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m_cwSmoother.getFadeSample(true, fadeFactor);
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sample = m_toneNco.next() * fadeFactor;
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sample.real(m_toneNco.next() * fadeFactor);
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sample.imag(0.0f);
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}
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else
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{
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if (m_cwSmoother.getFadeSample(false, fadeFactor))
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{
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sample = m_toneNco.next() * fadeFactor;
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sample.real(m_toneNco.next() * fadeFactor);
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sample.imag(0.0f);
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}
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else
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{
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sample = 0.0f;
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sample.real(0.0f);
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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 WFMModInputNone:
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default:
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sample = 0.0f;
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sample.real(0.0f);
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sample.imag(0.0f);
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break;
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}
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}
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@ -249,8 +244,6 @@ void WFMMod::stop()
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bool WFMMod::handleMessage(const Message& cmd)
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{
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qDebug() << "WFMMod::handleMessage";
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if (UpChannelizer::MsgChannelizerNotification::match(cmd))
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{
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UpChannelizer::MsgChannelizerNotification& notif = (UpChannelizer::MsgChannelizerNotification&) cmd;
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@ -353,7 +346,7 @@ void WFMMod::apply()
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m_interpolatorDistanceRemain = 0;
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m_interpolatorConsumed = false;
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m_interpolatorDistance = (Real) m_config.m_audioSampleRate / (Real) m_config.m_outputSampleRate;
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m_interpolator.create(48, m_config.m_audioSampleRate, m_config.m_rfBandwidth / 2.2, 3.0);
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m_interpolator.create(48, m_config.m_audioSampleRate, m_config.m_rfBandwidth, 3.0);
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m_settingsMutex.unlock();
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}
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@ -361,8 +354,7 @@ void WFMMod::apply()
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(m_config.m_audioSampleRate != m_running.m_audioSampleRate))
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{
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m_settingsMutex.lock();
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m_lowpass.create(301, m_config.m_audioSampleRate, 250.0);
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m_bandpass.create(301, m_config.m_audioSampleRate, 300.0, m_config.m_afBandwidth);
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m_lowpass.create(101, m_config.m_audioSampleRate, m_config.m_afBandwidth);
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m_settingsMutex.unlock();
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}
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@ -298,7 +298,6 @@ private:
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Real m_interpolatorDistanceRemain;
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bool m_interpolatorConsumed;
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Lowpass<Real> m_lowpass;
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Bandpass<Real> m_bandpass;
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Real m_magsq;
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MovingAverage<Real> m_movingAverage;
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@ -326,9 +325,8 @@ private:
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static const int m_levelNbSamples;
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void apply();
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void pullAF(Real& sample);
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void pullAF(Complex& sample);
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void calculateLevel(Real& sample);
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void modulateSample();
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void openFileStream();
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void seekFileStream(int seekPercentage);
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};
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@ -436,7 +436,7 @@ void WFMModGUI::applySettings()
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m_wfmMod->configure(m_wfmMod->getInputMessageQueue(),
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m_rfBW[ui->rfBW->currentIndex()],
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ui->afBW->value() * 1000.0,
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ui->fmDev->value() * 100.0f, // value is in '100 Hz
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ui->fmDev->value() * 1000.0f, // value is in '100 Hz
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ui->toneFrequency->value() * 10.0f,
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ui->volume->value() / 10.0f,
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ui->audioMute->isChecked(),
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@ -32,7 +32,7 @@
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<enum>Qt::StrongFocus</enum>
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</property>
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<property name="windowTitle">
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<string>NFM Modulator</string>
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<string>WFM Modulator</string>
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</property>
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<widget class="QWidget" name="settingsContainer" native="true">
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<property name="geometry">
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@ -243,7 +243,7 @@
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<number>1</number>
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</property>
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<property name="value">
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<number>3</number>
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<number>8</number>
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</property>
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<property name="orientation">
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<enum>Qt::Horizontal</enum>
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@ -259,7 +259,7 @@
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</size>
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</property>
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<property name="text">
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<string>3k</string>
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<string>8k</string>
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</property>
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<property name="alignment">
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<set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
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