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Simple WideFM demod.

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This commit is contained in:
John Greb 2014-12-21 22:46:24 +00:00
parent 1e8b20412c
commit 6de854e8d6
2 changed files with 9 additions and 6 deletions
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13
plugins/channel/wfm/wfmdemod.cpp
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@ -53,13 +53,16 @@ void WFMDemod::feed(SampleVector::const_iterator begin, SampleVector::const_iter
qint16 sample; qint16 sample;
for(SampleVector::const_iterator it = begin; it < end; ++it) { for(SampleVector::const_iterator it = begin; it < end; ++it) {
Complex c(it->real(), it->imag()); Real a = (0.005) * m_this.real() * (m_last.imag() - it->imag());
Complex d = c * conj(m_lastSample); Real b = (0.005) * m_this.imag() * (m_last.real() - it->real());
m_lastSample = c; m_last = m_this;
Complex e(atan2(d.imag(), d.real()), 0); m_this = Complex(it->real(), it->imag());
Complex e(b - a, 0);
Complex c;
if(m_interpolator.interpolate(&m_sampleDistanceRemain, e, &c)) { if(m_interpolator.interpolate(&m_sampleDistanceRemain, e, &c)) {
sample = (qint16)(c.real() * m_volume * 800.0); // TODO: Volume is a function of bandwidth
sample = (qint16)(c.real() * m_volume * m_volume);
m_sampleBuffer.push_back(Sample(sample, sample)); m_sampleBuffer.push_back(Sample(sample, sample));
m_audioBuffer[m_audioBufferFill].l = sample; m_audioBuffer[m_audioBufferFill].l = sample;
m_audioBuffer[m_audioBufferFill].r = sample; m_audioBuffer[m_audioBufferFill].r = sample;

2
plugins/channel/wfm/wfmdemod.h
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@ -75,7 +75,7 @@ private:
Interpolator m_interpolator; Interpolator m_interpolator;
Real m_sampleDistanceRemain; Real m_sampleDistanceRemain;
Complex m_lastSample; Complex m_last, m_this;
AudioVector m_audioBuffer; AudioVector m_audioBuffer;
uint m_audioBufferFill; uint m_audioBufferFill;