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DC correction needs floating point.

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This commit is contained in:
John Greb 2014-12-06 22:35:53 +00:00
parent e2b1a06772
commit 85b088cead
2 changed files with 11 additions and 12 deletions
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3
include-gpl/dsp/dspengine.h
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@ -91,8 +91,7 @@ private:
bool m_dcOffsetCorrection; bool m_dcOffsetCorrection;
bool m_iqImbalanceCorrection; bool m_iqImbalanceCorrection;
qint32 m_iOffset; double m_iOffset, m_qOffset;
qint32 m_qOffset;
qint32 m_iRange; qint32 m_iRange;
qint32 m_qRange; qint32 m_qRange;
qint32 m_imbalance; qint32 m_imbalance;

20
sdrbase/dsp/dspengine.cpp
View File

@ -71,6 +71,8 @@ void DSPEngine::stopAcquistion()
{ {
DSPAcquisitionStop cmd; DSPAcquisitionStop cmd;
cmd.execute(&m_messageQueue); cmd.execute(&m_messageQueue);
if(m_dcOffsetCorrection)
qDebug("DC offset:%f,%f", m_iOffset, m_qOffset);
} }
void DSPEngine::setSource(SampleSource* source) void DSPEngine::setSource(SampleSource* source)
@ -135,24 +137,22 @@ void DSPEngine::run()
void DSPEngine::dcOffset(SampleVector::iterator begin, SampleVector::iterator end) void DSPEngine::dcOffset(SampleVector::iterator begin, SampleVector::iterator end)
{ {
int count = end - begin; double count;
int io = 0; int io = 0;
int qo = 0; int qo = 0;
Sample corr((qint16)m_iOffset, (qint16)m_qOffset);
// sum all sample components // sum and correct in one pass
for(SampleVector::iterator it = begin; it < end; it++) { for(SampleVector::iterator it = begin; it < end; it++) {
io += it->real(); io += it->real();
qo += it->imag(); qo += it->imag();
*it -= corr;
} }
// build a sliding average (el cheapo style) // moving average
m_iOffset = (m_iOffset * 3 + io / count) >> 2; count = end - begin;
m_qOffset = (m_qOffset * 3 + qo / count) >> 2; m_iOffset = (15.0 * m_iOffset + (double)io / count) / 16.0;
m_qOffset = (15.0 * m_qOffset + (double)qo / count) / 16.0;
// correct samples
Sample corr(m_iOffset, m_qOffset);
for(SampleVector::iterator it = begin; it < end; it++)
*it -= corr;
} }
void DSPEngine::imbalance(SampleVector::iterator begin, SampleVector::iterator end) void DSPEngine::imbalance(SampleVector::iterator begin, SampleVector::iterator end)