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24 bit DSP build: corrected IQ imbalance calculation for any sample size

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f4exb 2018-01-25 00:48:11 +01:00
parent 236ed10c8c
commit a78997b5e7
1 changed files with 4 additions and 4 deletions
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8
sdrbase/dsp/dspdevicesourceengine.cpp
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@ -232,14 +232,14 @@ void DSPDeviceSourceEngine::imbalance(SampleVector::iterator begin, SampleVector
m_iRange = (m_iRange * 15 + (iMax - iMin)) >> 4;
m_qRange = (m_qRange * 15 + (qMax - qMin)) >> 4;
// calculate imbalance as Q15.16
// calculate imbalance on 32 bit full scale
if(m_qRange != 0) {
m_imbalance = ((uint)m_iRange << 16) / (uint)m_qRange;
m_imbalance = ((uint)m_iRange << (32-SDR_RX_SAMP_SZ)) / (uint)m_qRange;
}
// correct imbalance and convert back to signed int 16
// correct imbalance and convert back to sample size
for(SampleVector::iterator it = begin; it < end; it++) {
it->m_imag = (it->m_imag * m_imbalance) >> 16;
it->m_imag = (it->m_imag * m_imbalance) >> (32-SDR_RX_SAMP_SZ);
}
}