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Freq Scanner voice activity: check good spacing among broad peaks only

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f4exb 2026-02-16 01:10:55 +01:00
parent d96545f28b
commit e43f0e1e35
1 changed files with 9 additions and 6 deletions
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15
plugins/channelrx/freqscanner/freqscannersink.cpp
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@ -378,6 +378,7 @@ Real FreqScannerSink::voiceActivityLevel(int bin, int channelBins, bool isLSB) c
// Find peaks above noise floor
QVector<int> peakBins;
QVector<int> broadPeakBins;
QVector<Real> peakMags;
// Calculate average noise floor from raw FFT
@ -469,20 +470,22 @@ Real FreqScannerSink::voiceActivityLevel(int bin, int channelBins, bool isLSB) c
// Voice formants are typically 50-200 Hz wide
// CW signals are <50 Hz wide
if (bandwidth >= 50.0 && bandwidth <= 200.0) {
if (bandwidth >= 50.0 && bandwidth <= 200.0)
{
broadPeakBins.append(peakBin);
broadPeakCount++;
}
}
// Check formant spacing (voice formants are typically 500-1500 Hz apart)
bool goodSpacing = false;
if (broadPeakCount >= 2 && peakBins.size() >= 2)
if (broadPeakCount >= 2)
{
for (int p = 0; p < peakBins.size() - 1; p++)
for (int p = 0; p < broadPeakBins.size() - 1; p++)
{
int spacing = std::abs(peakBins[p + 1] - peakBins[p]);
int spacing = std::abs(broadPeakBins[p + 1] - broadPeakBins[p]);
float spacingHz = spacing * binBW;
if (spacingHz >= 400.0 && spacingHz <= 1800.0) {
if (spacingHz >= 400.0 && spacingHz <= 1100.0) {
goodSpacing = true;
break;
}
@ -555,7 +558,7 @@ Real FreqScannerSink::voiceActivityLevel(int bin, int channelBins, bool isLSB) c
score = std::min(score * 1.2f, 1.0f);
}
// Penalize if too many narrow peaks (likely CW or noise)
// Penalize if too many narrow peaks (likely CW or noise)
// => This condition is ALWAYS true as there are always many more peaks than broad peaks
// int narrowPeakCount = peakBins.size() - broadPeakCount;
// if (narrowPeakCount > broadPeakCount) {