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SSM modulator: added audio compressor

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f4exb
2017-08-05 19:08:33 +02:00
parent 0f9c8d17a5
commit d8f7dcebdc
8 changed files with 479 additions and 27 deletions
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sdrbase/dsp/agc.cpp
+26 -4
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@@ -53,7 +53,11 @@ MagAGC::MagAGC(int historySize, double R, double threshold) :
m_stepDelta(1.0/m_stepLength),
m_stepUpCounter(0),
m_stepDownCounter(m_stepLength),
m_gateCounter(0)
m_gateCounter(0),
m_stepDownDelay(historySize),
m_clamping(false),
m_R2(R*R),
m_clampMax(1.0)
{}
MagAGC::~MagAGC()
@@ -61,6 +65,7 @@ MagAGC::~MagAGC()
void MagAGC::resize(int historySize, Real R)
{
m_R2 = R*R;
m_stepLength = std::min(StepLengthMax, historySize/2);
m_stepDelta = 1.0 / m_stepLength;
m_stepUpCounter = 0;
@@ -88,7 +93,24 @@ double MagAGC::feedAndGetValue(const Complex& ci)
{
m_magsq = ci.real()*ci.real() + ci.imag()*ci.imag();
m_moving_average.feed(m_magsq);
m_u0 = m_R / (m_squared ? m_moving_average.average() : sqrt(m_moving_average.average()));
if (m_clamping)
{
if (m_squared)
{
double u0 = m_R / m_moving_average.average();
m_u0 = (u0 * m_magsq > m_clampMax) ? m_clampMax / m_magsq : u0;
}
else
{
double u02 = m_R2 / m_moving_average.average();
m_u0 = (u02 * m_magsq > m_clampMax) ? m_clampMax / sqrt(m_magsq) : sqrt(u02);
}
}
else
{
m_u0 = m_R / (m_squared ? m_moving_average.average() : sqrt(m_moving_average.average()));
}
if (m_thresholdEnable)
{
@@ -105,14 +127,14 @@ double MagAGC::feedAndGetValue(const Complex& ci)
}
else
{
if (m_count < m_moving_average.historySize()) {
if (m_count < m_stepDownDelay) {
m_count++;
}
m_gateCounter = 0;
}
if (m_count < m_moving_average.historySize())
if (m_count < m_stepDownDelay)
{
m_stepDownCounter = m_stepUpCounter;