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TCP SSB FFT.

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This commit is contained in:
John Greb 2014-12-17 21:06:02 +00:00
parent f1c223f297
commit 6944ed8ea9
2 changed files with 23 additions and 8 deletions
plugins/channel/tcpsrc
tcpsrc.cpptcpsrc.h

25
plugins/channel/tcpsrc/tcpsrc.cpp
View File

@ -25,6 +25,9 @@ TCPSrc::TCPSrc(MessageQueue* uiMessageQueue, TCPSrcGUI* tcpSrcGUI, SampleSink* s
m_spectrumEnabled = false;
m_nextSSBId = 0;
m_nextS16leId = 0;
TCPFilter = new fftfilt(0.01, 16.0 / 48.0, ssbFftLen);
// if (!TCPFilter) segfault;
}
TCPSrc::~TCPSrc()
@ -46,6 +49,11 @@ void TCPSrc::setSpectrum(MessageQueue* messageQueue, bool enabled)
void TCPSrc::feed(SampleVector::const_iterator begin, SampleVector::const_iterator end, bool positiveOnly)
{
Complex ci;
Complex* sideband;
m_sampleBuffer.clear();
m_sampleBufferSSB.clear();
for(SampleVector::const_iterator it = begin; it < end; ++it) {
Complex c(it->real() / 32768.0, it->imag() / 32768.0);
c *= m_nco.nextIQ();
@ -64,15 +72,17 @@ void TCPSrc::feed(SampleVector::const_iterator begin, SampleVector::const_iterat
if(m_ssbSockets.count() > 0) {
for(SampleVector::const_iterator it = m_sampleBuffer.begin(); it != m_sampleBuffer.end(); ++it) {
// TODO: fft filter
m_sampleBufferSSB.push_back(it->real() + it->imag());
Complex cj(it->real() / 20000.0, it->imag() / 20000.0);
int n_out = TCPFilter->run(cj, &sideband, true);
for (int i = 0; i < n_out; i+=2) {
Real one = (sideband[i].real() + sideband[i].imag()) * 0.7 * 20000.0;
Real two = (sideband[i+1].real() + sideband[i+1].imag()) * 0.7 * 20000.0;
m_sampleBufferSSB.push_back(Sample(one, two));
}
for(int i = 0; (n_out > 0) && (i < m_ssbSockets.count()); i++)
m_ssbSockets[i].socket->write((const char*)&m_sampleBufferSSB[0], n_out * 2);
}
for(int i = 0; i < m_ssbSockets.count(); i++)
m_ssbSockets[i].socket->write((const char*)&m_sampleBufferSSB[0], m_sampleBufferSSB.size());
}
m_sampleBuffer.clear();
m_sampleBufferSSB.clear();
}
void TCPSrc::start()
@ -116,6 +126,7 @@ bool TCPSrc::handleMessage(Message* cmd)
}
m_interpolator.create(16, m_inputSampleRate, m_rfBandwidth / 2.1);
m_sampleDistanceRemain = m_inputSampleRate / m_outputSampleRate;
TCPFilter->create_filter(0.3f / 48.0f, m_rfBandwidth / 2.0 / m_outputSampleRate);
cmd->completed();
return true;
} else if(MsgTCPSrcSpectrum::match(cmd)) {

6
plugins/channel/tcpsrc/tcpsrc.h
View File

@ -4,9 +4,12 @@
#include <QHostAddress>
#include "dsp/samplesink.h"
#include "dsp/nco.h"
#include "dsp/fftfilt.h"
#include "dsp/interpolator.h"
#include "util/message.h"
#define ssbFftLen 1024
class QTcpServer;
class QTcpSocket;
class TCPSrcGUI;
@ -122,9 +125,10 @@ protected:
NCO m_nco;
Interpolator m_interpolator;
Real m_sampleDistanceRemain;
fftfilt* TCPFilter;
SampleVector m_sampleBuffer;
std::vector<qint16> m_sampleBufferSSB;
SampleVector m_sampleBufferSSB;
SampleSink* m_spectrum;
bool m_spectrumEnabled;