FSK tweaks, minimum bandwidth adjust

src/AppFrame.cpp

@@ -120,6 +120,7 @@ AppFrame::AppFrame() :
     demodWaterfallCanvas->setup(1024, 128);
     demodWaterfallCanvas->setView(wxGetApp().getConfig()->getCenterFreq(), 300000);
     demodWaterfallCanvas->attachSpectrumCanvas(demodSpectrumCanvas);
+    demodWaterfallCanvas->setMinBandwidth(8000);
     demodSpectrumCanvas->attachWaterfallCanvas(demodWaterfallCanvas);
     demodVisuals->Add(demodWaterfallCanvas, 6, wxEXPAND | wxALL, 0);
     wxGetApp().getDemodSpectrumProcessor()->attachOutput(demodWaterfallCanvas->getVisualDataQueue());

src/demod/DemodulatorMgr.cpp

@@ -173,8 +173,8 @@ int DemodulatorMgr::getLastBandwidth() const {
 }
 
 void DemodulatorMgr::setLastBandwidth(int lastBandwidth) {
-    if (lastBandwidth < 1500) {
-        lastBandwidth = 1500;
+    if (lastBandwidth < MIN_BANDWIDTH) {
+        lastBandwidth = MIN_BANDWIDTH;
     } else  if (lastBandwidth > wxGetApp().getSampleRate()) {
         lastBandwidth = wxGetApp().getSampleRate();
     }

src/modules/modem/Modem.h

@@ -6,6 +6,8 @@
 #include <cmath>
 #include <atomic>
 
+#define MIN_BANDWIDTH 500
+
 class ModemKit {
 public:
     ModemKit() : sampleRate(0), audioSampleRate(0) {

src/modules/modem/ModemAnalog.cpp

@@ -9,8 +9,8 @@ std::string ModemAnalog::getType() {
 }
 
 int ModemAnalog::checkSampleRate(long long sampleRate, int audioSampleRate) {
-    if (sampleRate < 1500) {
-        return 1500;
+    if (sampleRate < MIN_BANDWIDTH) {
+        return MIN_BANDWIDTH;
     }
     return sampleRate;
 }

src/modules/modem/ModemDigital.cpp

@@ -20,8 +20,8 @@ std::string ModemDigital::getType() {
 }
 
 int ModemDigital::checkSampleRate(long long sampleRate, int audioSampleRate) {
-    if (sampleRate < 1500) {
-        return 1500;
+    if (sampleRate < MIN_BANDWIDTH) {
+        return MIN_BANDWIDTH;
     }
     return sampleRate;
 }

src/modules/modem/analog/ModemLSB.cpp

@@ -20,8 +20,8 @@ ModemLSB::~ModemLSB() {
 }
 
 int ModemLSB::checkSampleRate(long long sampleRate, int audioSampleRate) {
-    if (sampleRate < 1500) {
-        return 1500;
+    if (sampleRate < MIN_BANDWIDTH) {
+        return MIN_BANDWIDTH;
     }
     if (sampleRate % 2 == 0) {
         return sampleRate;

src/modules/modem/analog/ModemUSB.cpp

@@ -20,8 +20,8 @@ ModemUSB::~ModemUSB() {
 }
 
 int ModemUSB::checkSampleRate(long long sampleRate, int audioSampleRate) {
-    if (sampleRate < 1500) {
-        return 1500;
+    if (sampleRate < MIN_BANDWIDTH) {
+        return MIN_BANDWIDTH;
     }
     if (sampleRate % 2 == 0) {
         return sampleRate;

src/modules/modem/digital/ModemFSK.cpp

@@ -5,6 +5,7 @@ ModemFSK::ModemFSK() : ModemDigital()  {
     // DMR defaults?
     bps = 1;
     sps = 9600;
+    bw = 0.45;
     outStream << std::hex;
 }
 
@@ -35,6 +36,7 @@ ModemArgInfoList ModemFSK::getSettings() {
     bpsArg.value = std::to_string(bps);
     bpsArg.description = "Modem bits-per-symbol";
     bpsArg.type = ModemArgInfo::STRING;
+    bpsArg.units = "bits";
     
     std::vector<std::string> bpsOpts;
     bpsOpts.push_back("1");
@@ -51,22 +53,21 @@ ModemArgInfoList ModemFSK::getSettings() {
     spsArg.name = "Symbols/second";
     spsArg.value = std::to_string(sps);
     spsArg.description = "Modem symbols-per-second";
-    spsArg.type = ModemArgInfo::STRING;
-    
+    spsArg.type = ModemArgInfo::INT;
+    spsArg.range = ModemRange(10,115200);
     std::vector<std::string> spsOpts;
-    // some common modem rates ..?
-    spsOpts.push_back("300");
-    spsOpts.push_back("600");
-    spsOpts.push_back("1200");
-    spsOpts.push_back("2400");
-    spsOpts.push_back("4800");
-    spsOpts.push_back("9600");
-    spsOpts.push_back("19200");
-    spsOpts.push_back("38400");
-    spsArg.options = spsOpts;
     
     args.push_back(spsArg);
     
+    ModemArgInfo bwArg;
+    bwArg.key = "bw";
+    bwArg.name = "Signal bandwidth";
+    bwArg.value = std::to_string(bw);
+    bwArg.description = "Total signal bandwidth";
+    bwArg.type = ModemArgInfo::FLOAT;
+    bwArg.range = ModemRange(0.1,0.49);
+    args.push_back(bwArg);
+
     return args;
 }
 
@@ -77,6 +78,9 @@ void ModemFSK::writeSetting(std::string setting, std::string value) {
     } else if (setting == "sps") {
         sps = std::stoi(value);
         rebuildKit();
+    }  else if (setting == "bw") {
+        bw = std::stof(value);
+        rebuildKit();
     }
 }
 
@@ -85,6 +89,8 @@ std::string ModemFSK::readSetting(std::string setting) {
         return std::to_string(bps);
     } else if (setting == "sps") {
         return std::to_string(sps);
+    } else if (setting == "bw") {
+        return std::to_string(bw);
     }
     return "";
 }
@@ -93,8 +99,9 @@ ModemKit *ModemFSK::buildKit(long long sampleRate, int audioSampleRate) {
     ModemKitFSK *dkit = new ModemKitFSK;
     dkit->m           = bps;
     dkit->k           = sampleRate / sps;
+    dkit->bw          = bw;
 
-    dkit->demodFSK = fskdem_create(dkit->m, dkit->k, 0.45);
+    dkit->demodFSK = fskdem_create(dkit->m, dkit->k, dkit->bw);
 
     dkit->sampleRate = sampleRate;
     dkit->audioSampleRate = audioSampleRate;

src/modules/modem/digital/ModemFSK.h

@@ -5,6 +5,7 @@
 class ModemKitFSK : public ModemKitDigital {
 public:
     unsigned int m, k;
+    float bw;
     
     fskdem demodFSK;
     std::vector<liquid_float_complex> inputBuffer;
@@ -33,7 +34,7 @@ public:
     void demodulate(ModemKit *kit, ModemIQData *input, AudioThreadInput *audioOut);
 
 private:
-    int sps;
-    int bps;
+    int sps, bps;
+    float bw;
 };
 

src/modules/modem/digital/ModemGMSK.cpp

@@ -21,8 +21,8 @@ Modem *ModemGMSK::factory() {
 }
 
 int ModemGMSK::checkSampleRate(long long sampleRate, int audioSampleRate) {
-    if (sampleRate < 1500) {
-        return 1500;
+    if (sampleRate < MIN_BANDWIDTH) {
+        return MIN_BANDWIDTH;
     }
     return sampleRate;
 }

src/visual/WaterfallCanvas.cpp

@@ -17,8 +17,6 @@
 
 #include <wx/numformatter.h>
 
-#define MIN_BANDWIDTH 1500
-
 wxBEGIN_EVENT_TABLE(WaterfallCanvas, wxGLCanvas)
 EVT_PAINT(WaterfallCanvas::OnPaint)
 EVT_KEY_DOWN(WaterfallCanvas::OnKeyDown)
@@ -44,6 +42,7 @@ WaterfallCanvas::WaterfallCanvas(wxWindow *parent, int *attribList) :
     preBuf = false;
     SetCursor(wxCURSOR_CROSS);
     scaleMove = 0;
+    minBandwidth = 30000;
 }
 
 WaterfallCanvas::~WaterfallCanvas() {
@@ -179,8 +178,8 @@ void WaterfallCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
 
         if (currentZoom < 1) {
             bw = (long long) ceil((long double) bw * currentZoom);
-            if (bw < 30000) {
-                bw = 30000;
+            if (bw < minBandwidth) {
+                bw = minBandwidth;
             }
             if (mouseInView) {
                 long long mfreqA = getFrequencyAt(mpos);
@@ -852,4 +851,6 @@ void WaterfallCanvas::setLinesPerSecond(int lps) {
     tex_update.unlock();
 }
 
-
+void WaterfallCanvas::setMinBandwidth(int min) {
+    minBandwidth = min;
+}

src/visual/WaterfallCanvas.h

@@ -30,6 +30,7 @@ public:
     SpectrumVisualDataQueue *getVisualDataQueue();
 
     void setLinesPerSecond(int lps);
+    void setMinBandwidth(int min);
 
 private:
     void OnPaint(wxPaintEvent& event);
@@ -75,6 +76,7 @@ private:
     double lpsIndex;
     bool preBuf;
     std::mutex tex_update;
+    int minBandwidth;
     // event table
 wxDECLARE_EVENT_TABLE();
 };