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Remove DC spike from IQ stream and visuals

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IQ post-process / distribution in separate thread, use of
iirfilt_crcf_create_dc_blocker to reduce DC offset in IQ stream.
This commit is contained in:
Charles J. Cliffe
2014-11-29 13:58:20 -05:00
parent 93b20454d3
commit 499e411048
10 changed files with 184 additions and 66 deletions
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src/sdr/SDRThread.cpp
+8 -24
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@@ -4,7 +4,7 @@
#include "CubicSDR.h"
SDRThread::SDRThread(SDRThreadCommandQueue* pQueue) :
m_pQueue(pQueue), iqDataOutQueue(NULL), iqVisualQueue(NULL), terminated(false) {
m_pQueue(pQueue), iqDataOutQueue(NULL), terminated(false) {
dev = NULL;
sample_rate = SRATE;
}
@@ -110,7 +110,7 @@ void SDRThread::threadMain() {
rtlsdr_set_sample_rate(dev, bandwidth);
rtlsdr_set_center_freq(dev, frequency);
rtlsdr_set_agc_mode(dev, 1);
rtlsdr_set_offset_tuning(dev, 1);
rtlsdr_set_offset_tuning(dev, 0);
rtlsdr_reset_buffer(dev);
sample_rate = rtlsdr_get_sample_rate(dev);
@@ -122,13 +122,15 @@ void SDRThread::threadMain() {
std::cout << "Sampling..";
while (!terminated) {
if (!m_pQueue->empty()) {
SDRThreadCommandQueue *cmdQueue = m_pQueue.load();
if (!cmdQueue->empty()) {
bool freq_changed = false;
float new_freq;
while (!m_pQueue->empty()) {
while (!cmdQueue->empty()) {
SDRThreadCommand command;
m_pQueue->pop(command);
cmdQueue->pop(command);
switch (command.cmd) {
case SDRThreadCommand::SDR_THREAD_CMD_TUNE:
@@ -162,26 +164,8 @@ void SDRThread::threadMain() {
dataOut.data = new_buffer;
if (iqDataOutQueue != NULL) {
iqDataOutQueue->push(dataOut);
iqDataOutQueue.load()->push(dataOut);
}
if (iqVisualQueue != NULL) {
iqVisualQueue->push(dataOut);
}
if (demodulators.size()) {
DemodulatorThreadIQData demodDataOut;
demodDataOut.frequency = frequency;
demodDataOut.bandwidth = bandwidth;
demodDataOut.data = new_buffer;
for (int i = 0, iMax = demodulators.size(); i < iMax; i++) {
DemodulatorInstance *demod = demodulators[i];
DemodulatorThreadInputQueue *demodQueue = demod->threadQueueDemod;
demodQueue->push(demodDataOut);
}
}
}
}