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SSB demod: interpolator fixes

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This commit is contained in:
f4exb 2018-01-05 18:38:47 +01:00
parent b26126ffaa
commit aed125e3d0
2 changed files with 11 additions and 10 deletions
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16
plugins/channelrx/demodssb/ssbdemod.cpp
View File

@ -66,10 +66,6 @@ SSBDemod::SSBDemod(DeviceSourceAPI *deviceAPI) :
m_inputFrequencyOffset = 0;
m_audioSampleRate = DSPEngine::instance()->getAudioSampleRate();
m_nco.setFreq(m_inputFrequencyOffset, m_inputSampleRate);
m_interpolator.create(16, m_inputSampleRate, 5000);
m_sampleDistanceRemain = (Real) m_inputSampleRate / m_audioSampleRate;
m_audioBuffer.resize(1<<9);
m_audioBufferFill = 0;
m_undersampleCount = 0;
@ -161,7 +157,7 @@ void SSBDemod::feed(const SampleVector::const_iterator& begin, const SampleVecto
Complex c(it->real(), it->imag());
c *= m_nco.nextIQ();
if(m_interpolator.decimate(&m_sampleDistanceRemain, c, &ci))
if(m_interpolator.decimate(&m_interpolatorDistanceRemain, c, &ci))
{
if (m_dsb)
{
@ -172,7 +168,7 @@ void SSBDemod::feed(const SampleVector::const_iterator& begin, const SampleVecto
n_out = SSBFilter->runSSB(ci, &sideband, m_usb);
}
m_sampleDistanceRemain += (Real) m_inputSampleRate / m_audioSampleRate;
m_interpolatorDistanceRemain += m_interpolatorDistance;
}
else
{
@ -352,7 +348,9 @@ void SSBDemod::applyChannelSettings(int inputSampleRate, int inputFrequencyOffse
if (m_inputSampleRate != inputSampleRate)
{
m_settingsMutex.lock();
m_interpolator.create(16, m_inputSampleRate, m_settings.m_rfBandwidth * 2.0f);
m_interpolator.create(16, m_inputSampleRate, m_Bandwidth / 2.2f);
m_interpolatorDistanceRemain = 0;
m_interpolatorDistance = (Real) inputSampleRate / (Real) m_settings.m_audioSampleRate;
m_settingsMutex.unlock();
}
@ -407,7 +405,9 @@ void SSBDemod::applySettings(const SSBDemodSettings& settings, bool force)
m_LowCutoff = lowCutoff;
m_settingsMutex.lock();
m_interpolator.create(16, m_inputSampleRate, band * 2.0f);
m_interpolator.create(16, m_inputSampleRate, m_Bandwidth / 2.2f);
m_interpolatorDistanceRemain = 0;
m_interpolatorDistance = (Real) m_inputSampleRate / (Real) m_settings.m_audioSampleRate;
SSBFilter->create_filter(m_LowCutoff / (float) m_audioSampleRate, m_Bandwidth / (float) m_audioSampleRate);
DSBFilter->create_dsb_filter((2.0f * m_Bandwidth) / (float) m_audioSampleRate);
m_settingsMutex.unlock();

5
plugins/channelrx/demodssb/ssbdemod.h
View File

@ -261,8 +261,9 @@ private:
bool m_audioActive; //!< True if an audio signal is produced (no AGC or AGC and above threshold)
NCOF m_nco;
Interpolator m_interpolator;
Real m_sampleDistanceRemain;
Interpolator m_interpolator;
Real m_interpolatorDistance;
Real m_interpolatorDistanceRemain;
fftfilt* SSBFilter;
fftfilt* DSBFilter;