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SSB demod: yet again another clamping algorithm

This commit is contained in:
f4exb 2018-05-28 02:40:26 +02:00
parent 8155825bc4
commit 723747e9dc
2 changed files with 7 additions and 13 deletions
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2
plugins/channelrx/demodssb/ssbdemod.cpp
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@ -85,7 +85,7 @@ SSBDemod::SSBDemod(DeviceSourceAPI *deviceAPI) :
m_magsqPeak = 0.0f; m_magsqPeak = 0.0f;
m_magsqCount = 0; m_magsqCount = 0;
m_agc.setClampMax(SDR_RX_SCALED*SDR_RX_SCALED); m_agc.setClampMax(SDR_RX_SCALED/100.0);
m_agc.setClamping(m_agcClamping); m_agc.setClamping(m_agcClamping);
SSBFilter = new fftfilt(m_LowCutoff / m_audioSampleRate, m_Bandwidth / m_audioSampleRate, ssbFftLen); SSBFilter = new fftfilt(m_LowCutoff / m_audioSampleRate, m_Bandwidth / m_audioSampleRate, ssbFftLen);

18
sdrbase/dsp/agc.cpp
View File

@ -104,25 +104,19 @@ double MagAGC::feedAndGetValue(const Complex& ci)
{ {
if (m_squared) if (m_squared)
{ {
double u0 = m_R / m_moving_average.average(); if (m_magsq > m_clampMax) {
double du = (u0*m_magsq) - (m_clampMax/4.0); m_u0 = m_clampMax / m_magsq;
if (du > 0) {
m_u0 = (m_clampMax/4.0)*(1.0 + (log10(1+du)/8.0)); // experimental clipping limiter
} else { } else {
m_u0 = u0; m_u0 = m_R / m_moving_average.average();
} }
//m_u0 = (u0 * m_magsq > m_clampMax) ? m_clampMax / m_magsq : u0;
} }
else else
{ {
double u02 = m_R2 / m_moving_average.average(); if (sqrt(m_magsq) > m_clampMax) {
double du = (u02*m_magsq) - (m_clampMax/4.0); m_u0 = m_clampMax / sqrt(m_magsq);
if (du > 0) {
m_u0 = (m_clampMax/4.0)*(1.0 + (log10(1+du)/8.0)); // experimental clipping limiter
} else { } else {
m_u0 = sqrt(u02); m_u0 = m_R / sqrt(m_moving_average.average());
} }
//m_u0 = (u02 * m_magsq > m_clampMax) ? sqrt(m_clampMax / m_magsq) : sqrt(u02);
} }
} }
else else