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AF squelch

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f4exb 2017-05-13 16:01:41 +02:00
parent 70d2ce6cec
commit 7430dee09a
1 changed files with 4 additions and 3 deletions
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7
sdrbase/dsp/afsquelch.cpp
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@ -117,7 +117,7 @@ void AFSquelch::setCoefficients(int N, unsigned int nbAvg, int _samplerate, int
// for each of the frequencies (tones) of interest calculate // for each of the frequencies (tones) of interest calculate
// k and the associated filter coefficient as per the Goertzel // k and the associated filter coefficient as per the Goertzel
// algorithm. Note: we are using a real value (as apposed to // algorithm. Note: we are using a real value (as opposed to
// an integer as described in some references. k is retained // an integer as described in some references. k is retained
// for later display. The tone set is specified in the // for later display. The tone set is specified in the
// constructor. Notice that the resulting coefficients are // constructor. Notice that the resulting coefficients are
@ -182,7 +182,8 @@ void AFSquelch::feedForward()
{ {
m_power[j] = (m_u0[j] * m_u0[j]) + (m_u1[j] * m_u1[j]) - (m_coef[j] * m_u0[j] * m_u1[j]); m_power[j] = (m_u0[j] * m_u0[j]) + (m_u1[j] * m_u1[j]) - (m_coef[j] * m_u0[j] * m_u1[j]);
m_movingAverages[j].feed(m_power[j]); m_movingAverages[j].feed(m_power[j]);
m_u0[j] = m_u1[j] = 0.0; // reset for next block. m_u0[j] = 0.0;
m_u1[j] = 0.0; // reset for next block.
} }
evaluate(); evaluate();
@ -229,7 +230,7 @@ bool AFSquelch::evaluate()
} }
// principle is to open if power is uneven because noise gives even power // principle is to open if power is uneven because noise gives even power
bool open = maxPower == 0.0 ? true : (minPower/maxPower < m_threshold) && (minIndex > maxIndex); bool open = maxPower > 0.0 ? (minPower/maxPower < m_threshold) && (minIndex > maxIndex) : true;
//qDebug("AFSquelch::evaluate: %g : %g", minPower/maxPower, m_threshold); //qDebug("AFSquelch::evaluate: %g : %g", minPower/maxPower, m_threshold);
if (open) if (open)