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Demispectrum.

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This commit is contained in:
Hexameron
2014-06-15 09:32:25 +01:00
parent bbe6d4505d
commit fa780d9134
18 changed files with 43 additions and 34 deletions
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sdrbase/dsp/spectrumvis.cpp
+10 -2
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@@ -34,7 +34,7 @@ void SpectrumVis::configure(MessageQueue* msgQueue, int fftSize, int overlapPerc
cmd->submit(msgQueue, this);
}
void SpectrumVis::feed(SampleVector::const_iterator begin, SampleVector::const_iterator end, bool firstOfBurst)
void SpectrumVis::feed(SampleVector::const_iterator begin, SampleVector::const_iterator end, bool positiveOnly)
{
// if no visualisation is set, send the samples to /dev/null
if(m_glSpectrum == NULL)
@@ -60,7 +60,15 @@ void SpectrumVis::feed(SampleVector::const_iterator begin, SampleVector::const_i
Real ofs = 20.0f * log10f(1.0f / m_fftSize);
Real mult = (10.0f / log2f(10.0f));
const Complex* fftOut = m_fft->out();
for(size_t i = 0; i < m_fftSize; i++) {
size_t spectrumStart = 0;
if ( positiveOnly ) {
Real logZero = ofs + mult * log2f( 0 );
for(size_t i = 0; i < m_fftSize / 2; i++)
m_logPowerSpectrum[i] = logZero;
spectrumStart = m_fftSize / 2;
}
for(size_t i = spectrumStart; i < m_fftSize; i++) {
Complex c = fftOut[((i + (m_fftSize >> 1)) & (m_fftSize - 1))];
Real v = c.real() * c.real() + c.imag() * c.imag();
v = mult * log2f(v) + ofs;