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Center audio spectrum.

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This commit is contained in:
Hexameron
2014-06-17 20:13:49 +01:00
parent fa780d9134
commit 960700249c
4 changed files with 27 additions and 16 deletions
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sdrbase/dsp/spectrumvis.cpp
+22 -11
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@@ -60,19 +60,30 @@ 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();
size_t spectrumStart = 0;
Complex c;
Real v;
size_t halfSize = m_fftSize / 2;
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;
m_logPowerSpectrum[i] = v;
for(size_t i = 0; i < halfSize; i++) {
c = fftOut[i];
v = c.real() * c.real() + c.imag() * c.imag();
v = mult * log2f(v) + ofs;
m_logPowerSpectrum[i * 2] = v;
m_logPowerSpectrum[i * 2 + 1] = v;
}
} else {
for(size_t i = 0; i < halfSize; i++) {
c = fftOut[i + halfSize];
v = c.real() * c.real() + c.imag() * c.imag();
v = mult * log2f(v) + ofs;
m_logPowerSpectrum[i] = v;
c = fftOut[i];
v = c.real() * c.real() + c.imag() * c.imag();
v = mult * log2f(v) + ofs;
m_logPowerSpectrum[i + halfSize] = v;
}
}
// send new data to visualisation