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DSPEngine: better DC offset compensation

This commit is contained in:
Christian Daniel 2012-06-05 15:23:27 +02:00
parent 17caf907d6
commit 22faf7b354
1 changed files with 8 additions and 12 deletions
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20
dsp/dspengine.cpp
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@ -158,24 +158,20 @@ void DSPEngine::work()
m_fftPreWindow[i] = Complex(j, q);
}
// m_iOfs = m_iOfs * 0.999 + (m_iOfs + ((m_iMax + m_iMin) / 2.0)) * 0.001;
// m_qOfs = m_qOfs * 0.999 + (m_qOfs + ((m_qMax + m_qMin) / 2.0)) * 0.001;
/*
qDebug("iOfs:%.6f qOfs:%.6f (%.6f %.6f) [%.6f %.6f %.6f %.6f]",
m_iOfs, m_qOfs,
((m_iMax + m_iMin) / 2.0), ((m_qMax + m_qMin) / 2.0),
m_iMin, m_iMax, m_qMin, m_qMax);
*/
// apply fft window
m_fftWindow.apply(m_fftPreWindow, &m_fftIn);
// calculate FFT
m_fft.transform(&m_fftIn[0], &m_fftOut[0]);
{
const Complex& c = (m_fftOut.at(0)) / (Real)m_fftSize;
if((fabs(c.real()) < 1) && (fabs(c.imag()) < 1)) {
m_iOfs = m_iOfs * 0.99 + (m_iOfs + c.real()) * 0.01;
m_qOfs = m_qOfs * 0.99 + (m_qOfs + c.imag()) * 0.01;
const Complex& c = m_fftOut[0] / (Real)m_fftSize;
if((fabs(m_iOfs - c.real()) > 0.001) || (fabs(m_qOfs - c.imag()) > 0.001)) {
m_iOfs = m_iOfs * 0.995 + (m_iOfs + c.real()) * 0.005;
m_qOfs = m_qOfs * 0.995 + (m_qOfs + c.imag()) * 0.005;
} else {
m_iOfs = m_iOfs * 0.999995 + (m_iOfs + c.real()) * 0.000005;
m_qOfs = m_qOfs * 0.999995 + (m_qOfs + c.imag()) * 0.000005;
}
}