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Up channelizer: implemented direct setting of filter chain

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This commit is contained in:
f4exb 2019-04-25 09:26:03 +02:00
parent 3a5bc0ac3a
commit e55f33ffc9
2 changed files with 85 additions and 8 deletions
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77
sdrbase/dsp/upchannelizer.cpp
View File

@ -25,6 +25,7 @@
#include <QDebug>
MESSAGE_CLASS_DEFINITION(UpChannelizer::MsgChannelizerNotification, Message)
MESSAGE_CLASS_DEFINITION(UpChannelizer::MsgSetChannelizer, Message)
UpChannelizer::UpChannelizer(BasebandSampleSource* sampleSource) :
m_sampleSource(sampleSource),
@ -157,6 +158,14 @@ bool UpChannelizer::handleMessage(const Message& cmd)
return true;
}
else if (MsgSetChannelizer::match(cmd))
{
MsgSetChannelizer& chan = (MsgSetChannelizer&) cmd;
qDebug() << "UpChannelizer::handleMessage: MsgSetChannelizer";
applySetting(chan.getStageIndexes());
return true;
}
else
{
return false;
@ -208,6 +217,30 @@ void UpChannelizer::applyConfiguration()
}
}
void UpChannelizer::applySetting(const std::vector<unsigned int>& stageIndexes)
{
m_mutex.lock();
freeFilterChain();
m_currentCenterFrequency = m_outputSampleRate * setFilterChain(stageIndexes);
m_mutex.unlock();
m_currentInputSampleRate = m_outputSampleRate / (1 << m_filterStages.size());
m_requestedInputSampleRate = m_currentInputSampleRate;
qDebug() << "UpChannelizer::applySetting in=" << m_outputSampleRate
<< ", out=" << m_currentInputSampleRate
<< ", fc=" << m_currentCenterFrequency;
if (m_sampleSource != 0)
{
MsgChannelizerNotification *notif = MsgChannelizerNotification::create(m_outputSampleRate, m_currentInputSampleRate, m_currentCenterFrequency);
m_sampleSource->getInputMessageQueue()->push(notif);
}
}
#ifdef USE_SSE4_1
UpChannelizer::FilterStage::FilterStage(Mode mode) :
m_filter(new IntHalfbandFilterEO1<UPCHANNELIZER_HB_FILTER_ORDER>),
@ -266,21 +299,17 @@ bool UpChannelizer::signalContainsChannel(Real sigStart, Real sigEnd, Real chanS
Real UpChannelizer::createFilterChain(Real sigStart, Real sigEnd, Real chanStart, Real chanEnd)
{
Real sigBw = sigEnd - sigStart;
Real safetyMargin = sigBw / 20;
Real rot = sigBw / 4;
Sample s;
safetyMargin = 0;
qDebug() << "UpChannelizer::createFilterChain: start:"
<< " sig: [" << sigStart << ":" << sigEnd << "]"
<< " BW: " << sigBw
<< " chan: [" << chanStart << ":" << chanEnd << "]"
<< " rot: " << rot
<< " safety: " << safetyMargin;
<< " rot: " << rot;
// check if it fits into the left half
if(signalContainsChannel(sigStart + safetyMargin, sigStart + sigBw / 2.0 - safetyMargin, chanStart, chanEnd))
if(signalContainsChannel(sigStart, sigStart + sigBw / 2.0, chanStart, chanEnd))
{
qDebug() << "UpChannelizer::createFilterChain: take left half (rotate by +1/4 and decimate by 2):"
<< " [" << m_filterStages.size() << "]"
@ -291,7 +320,7 @@ Real UpChannelizer::createFilterChain(Real sigStart, Real sigEnd, Real chanStart
}
// check if it fits into the right half
if(signalContainsChannel(sigEnd - sigBw / 2.0f + safetyMargin, sigEnd - safetyMargin, chanStart, chanEnd))
if(signalContainsChannel(sigEnd - sigBw / 2.0f, sigEnd, chanStart, chanEnd))
{
qDebug() << "UpChannelizer::createFilterChain: take right half (rotate by -1/4 and decimate by 2):"
<< " [" << m_filterStages.size() << "]"
@ -303,7 +332,7 @@ Real UpChannelizer::createFilterChain(Real sigStart, Real sigEnd, Real chanStart
// check if it fits into the center
// Was: if(signalContainsChannel(sigStart + rot + safetyMargin, sigStart + rot + sigBw / 2.0f - safetyMargin, chanStart, chanEnd)) {
if(signalContainsChannel(sigStart + rot + safetyMargin, sigEnd - rot - safetyMargin, chanStart, chanEnd))
if(signalContainsChannel(sigStart + rot, sigEnd - rot, chanStart, chanEnd))
{
qDebug() << "UpChannelizer::createFilterChain: take center half (decimate by 2):"
<< " [" << m_filterStages.size() << "]"
@ -324,6 +353,38 @@ Real UpChannelizer::createFilterChain(Real sigStart, Real sigEnd, Real chanStart
return ofs;
}
double UpChannelizer::setFilterChain(const std::vector<unsigned int>& stageIndexes)
{
// filters are described from lower to upper level but the chain is constructed the other way round
std::vector<unsigned int>::const_reverse_iterator rit = stageIndexes.rbegin();
double ofs = 0.0, ofs_stage = 0.25;
// Each index is a base 3 number with 0 = low, 1 = center, 2 = high
// Functions at upper level will convert a number to base 3 to describe the filter chain. Common converting
// algorithms will go from LSD to MSD. This explains the reverse order.
for (; rit != stageIndexes.rend(); ++rit)
{
if (*rit == 0)
{
m_filterStages.push_back(new FilterStage(FilterStage::ModeLowerHalf));
ofs -= ofs_stage;
}
else if (*rit == 1)
{
m_filterStages.push_back(new FilterStage(FilterStage::ModeCenter));
}
else if (*rit == 2)
{
m_filterStages.push_back(new FilterStage(FilterStage::ModeUpperHalf));
ofs += ofs_stage;
}
ofs_stage /= 2;
}
return ofs;
}
void UpChannelizer::freeFilterChain()
{
for(FilterStages::iterator it = m_filterStages.begin(); it != m_filterStages.end(); ++it)

16
sdrbase/dsp/upchannelizer.h
View File

@ -63,6 +63,20 @@ public:
qint64 m_frequencyOffset;
};
class SDRBASE_API MsgSetChannelizer : public Message {
MESSAGE_CLASS_DECLARATION
public:
MsgSetChannelizer() :
Message()
{ }
std::vector<unsigned int>& getStageIndexes() { return m_stageIndexes; }
private:
std::vector<unsigned int> m_stageIndexes;
};
UpChannelizer(BasebandSampleSource* sampleSink);
virtual ~UpChannelizer();
@ -115,8 +129,10 @@ protected:
QMutex m_mutex;
void applyConfiguration();
void applySetting(const std::vector<unsigned int>& stageIndexes);
bool signalContainsChannel(Real sigStart, Real sigEnd, Real chanStart, Real chanEnd) const;
Real createFilterChain(Real sigStart, Real sigEnd, Real chanStart, Real chanEnd);
double setFilterChain(const std::vector<unsigned int>& stageIndexes); //!< returns offset in ratio of sample rate
void freeFilterChain();
signals: