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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/visual/SpectrumCanvas.cpp
+12 -11
View File
@@ -117,19 +117,20 @@ void SpectrumCanvas::setData(std::vector<signed char> *data) {
fft_result_maa.resize(FFT_SIZE);
}
for (int j = 0; j < 2; j++) {
for (int i = 0, iMax = FFT_SIZE / 2; i < iMax; i++) {
double a = out[i][0];
double b = out[i][1];
double c = sqrt(a * a + b * b);
int n;
for (int i = 0, iMax = FFT_SIZE / 2; i < iMax; i++) {
n = (i == 0)?1:i;
double a = out[n][0];
double b = out[n][1];
double c = sqrt(a * a + b * b);
double x = out[FFT_SIZE / 2 + i][0];
double y = out[FFT_SIZE / 2 + i][1];
double z = sqrt(x * x + y * y);
n = (i == FFT_SIZE/2)?(FFT_SIZE/2+1):i;
double x = out[FFT_SIZE / 2 + n][0];
double y = out[FFT_SIZE / 2 + n][1];
double z = sqrt(x * x + y * y);
fft_result[i] = (z);
fft_result[FFT_SIZE / 2 + i] = (c);
}
fft_result[i] = (z);
fft_result[FFT_SIZE / 2 + i] = (c);
}
float time_slice = (float) SRATE / (float) (BUF_SIZE / 2);
src/visual/WaterfallCanvas.cpp
+16 -15
View File
@@ -85,13 +85,13 @@ void WaterfallCanvas::OnKeyDown(wxKeyEvent& event) {
switch (event.GetKeyCode()) {
case WXK_RIGHT:
freq = wxGetApp().getFrequency();
freq += SRATE/2;
freq += SRATE / 2;
wxGetApp().setFrequency(freq);
((wxFrame*) parent)->GetStatusBar()->SetStatusText(wxString::Format(wxT("Set center frequency: %i"), freq));
break;
case WXK_LEFT:
freq = wxGetApp().getFrequency();
freq -= SRATE/2;
freq -= SRATE / 2;
wxGetApp().setFrequency(freq);
((wxFrame*) parent)->GetStatusBar()->SetStatusText(wxString::Format(wxT("Set center frequency: %i"), freq));
break;
@@ -129,19 +129,20 @@ void WaterfallCanvas::setData(std::vector<signed char> *data) {
fft_result_maa.resize(FFT_SIZE);
}
for (int j = 0; j < 2; j++) {
for (int i = 0, iMax = FFT_SIZE / 2; i < iMax; i++) {
double a = out[i][0];
double b = out[i][1];
double c = sqrt(a * a + b * b);
int n;
for (int i = 0, iMax = FFT_SIZE / 2; i < iMax; i++) {
n = (i == 0) ? 1 : i;
double a = out[n][0];
double b = out[n][1];
double c = sqrt(a * a + b * b);
double x = out[FFT_SIZE / 2 + i][0];
double y = out[FFT_SIZE / 2 + i][1];
double z = sqrt(x * x + y * y);
n = (i == FFT_SIZE / 2) ? (FFT_SIZE / 2 + 1) : i;
double x = out[FFT_SIZE / 2 + n][0];
double y = out[FFT_SIZE / 2 + n][1];
double z = sqrt(x * x + y * y);
fft_result[i] = (z);
fft_result[FFT_SIZE / 2 + i] = (c);
}
fft_result[i] = (z);
fft_result[FFT_SIZE / 2 + i] = (c);
}
float time_slice = (float) SRATE / (float) (BUF_SIZE / 2);
@@ -192,7 +193,7 @@ void WaterfallCanvas::mouseMoved(wxMouseEvent& event) {
if (mTracker.mouseDown()) {
if (demod && mTracker.getDeltaMouseY()) {
int bwDiff = (int)(mTracker.getDeltaMouseY() * 100000.0);
int bwDiff = (int) (mTracker.getDeltaMouseY() * 100000.0);
if (!demodBW) {
demodBW = demod->getParams().bandwidth;
@@ -249,7 +250,7 @@ void WaterfallCanvas::mouseReleased(wxMouseEvent& event) {
DemodulatorInstance *demod = wxGetApp().getDemodTest();
int freq = center_freq - (int)(0.5 * (float)SRATE) + (int)((float)pos * (float)SRATE);
int freq = center_freq - (int) (0.5 * (float) SRATE) + (int) ((float) pos * (float) SRATE);
DemodulatorThreadCommand command;
command.cmd = DemodulatorThreadCommand::SDR_THREAD_CMD_SET_FREQUENCY;