Added IQ correction

core/src/core.cpp

@@ -206,6 +206,7 @@ int sdrpp_main(int argc, char *argv[]) {
     defConfig["showWaterfall"] = true;
     defConfig["source"] = "";
     defConfig["decimationPower"] = 0;
+    defConfig["iqCorrection"] = false;
 
     defConfig["streams"]["Radio"]["muted"] = false;
     defConfig["streams"]["Radio"]["sink"] = "Audio";

core/src/gui/menus/source.cpp

@@ -12,6 +12,7 @@ namespace sourecmenu {
     double customOffset = 0.0;
     double effectiveOffset = 0.0;
     int decimationPower = 0;
+    bool iqCorrection = false;
 
     EventHandler<std::string> sourceRegisteredHandler;
     EventHandler<std::string> sourceUnregisterHandler;
@@ -124,6 +125,8 @@ namespace sourecmenu {
         customOffset = core::configManager.conf["offset"];
         offsetMode = core::configManager.conf["offsetMode"];
         decimationPower = core::configManager.conf["decimationPower"];
+        iqCorrection = core::configManager.conf["iqCorrection"];
+        sigpath::signalPath.setIQCorrection(iqCorrection);
         updateOffset();
 
         refreshSources();
@@ -158,6 +161,13 @@ namespace sourecmenu {
 
         sigpath::sourceManager.showSelectedMenu();
 
+        if (ImGui::Checkbox("IQ Correction##_sdrpp_iq_corr", &iqCorrection)) {
+            sigpath::signalPath.setIQCorrection(iqCorrection);
+            core::configManager.acquire();
+            core::configManager.conf["iqCorrection"] = iqCorrection;
+            core::configManager.release(true);
+        }
+
         ImGui::Text("Offset mode");
         ImGui::SameLine();
         ImGui::SetNextItemWidth(itemWidth - ImGui::GetCursorPosX());

core/src/signal_path/dsp.cpp

@@ -16,7 +16,8 @@ void SignalPath::init(uint64_t sampleRate, int fftRate, int fftSize, dsp::stream
 
     // split.init(input);
     inputBuffer.init(input);
-    split.init(&inputBuffer.out);
+    corrector.init(&inputBuffer.out, 100.0f / sampleRate);
+    split.init(&corrector.out);
 
     reshape.init(&fftStream, fftSize, (sampleRate / fftRate) - fftSize);
     split.bindStream(&fftStream);
@@ -43,6 +44,8 @@ void SignalPath::setSampleRate(double sampleRate) {
         vfo.vfo->start();
     }
 
+    corrector.setCorrectionRate(100.0f / sampleRate);
+
     split.start();
 }
 
@@ -55,6 +58,7 @@ void SignalPath::start() {
         decimator->start();
     }
     inputBuffer.start();
+    corrector.start();
     split.start();
     reshape.start();
     fftHandlerSink.start();
@@ -66,6 +70,7 @@ void SignalPath::stop() {
         decimator->stop();
     }
     inputBuffer.stop();
+    corrector.stop();
     split.stop();
     reshape.stop();
     fftHandlerSink.stop();
@@ -159,7 +164,7 @@ void SignalPath::setDecimation(int dec) {
 
     // If no decimation, reconnect
     if (!dec) {
-        split.setInput(&inputBuffer.out);
+        split.setInput(&corrector.out);
         if (running) { split.start(); }
         core::setInputSampleRate(sourceSampleRate);
         return;
@@ -167,7 +172,7 @@ void SignalPath::setDecimation(int dec) {
     
     // Create new decimators
     for (int i = 0; i < dec; i++) {
-        dsp::HalfDecimator<dsp::complex_t>* decimator = new dsp::HalfDecimator<dsp::complex_t>((i == 0) ? &inputBuffer.out : &decimators[i-1]->out, &halfBandWindow);
+        dsp::HalfDecimator<dsp::complex_t>* decimator = new dsp::HalfDecimator<dsp::complex_t>((i == 0) ? &corrector.out : &decimators[i-1]->out, &halfBandWindow);
         if (running) { decimator->start(); }
         decimators.push_back(decimator);
     }
@@ -177,3 +182,11 @@ void SignalPath::setDecimation(int dec) {
     // Update the DSP sample rate
     core::setInputSampleRate(sourceSampleRate);
 }
+
+void SignalPath::setIQCorrection(bool enabled) {
+    corrector.bypass = !enabled;
+    if (!enabled) {
+        corrector.offset.re = 0;
+        corrector.offset.im = 0;
+    }
+}

core/src/signal_path/dsp.h

@@ -4,6 +4,7 @@
 #include <map>
 #include <dsp/sink.h>
 #include <dsp/decimation.h>
+#include <dsp/correction.h>
 
 class SignalPath {
 public:
@@ -24,6 +25,7 @@ public:
     void stopFFT();
     void setBuffering(bool enabled);
     void setDecimation(int dec);
+    void setIQCorrection(bool enabled);
 
     dsp::SampleFrameBuffer<dsp::complex_t> inputBuffer;
     double sourceSampleRate = 0;
@@ -36,6 +38,7 @@ private:
     };
 
     dsp::Splitter<dsp::complex_t> split;
+    dsp::IQCorrector corrector;
 
     // FFT
     dsp::stream<dsp::complex_t> fftStream;