Added meteor recovery option

decoder_modules/meteor_demodulator/src/main.cpp

@@ -6,7 +6,7 @@
 #include <signal_path/signal_path.h>
 #include <module.h>
 #include <filesystem>
-#include <dsp/demod/psk.h>
+#include "meteor_demod.h"
 #include <dsp/routing/splitter.h>
 #include <dsp/buffer/reshaper.h>
 #include <dsp/sink/handler_sink.h>
@@ -47,16 +47,20 @@ public:
 
         // Load config
         config.acquire();
-        bool created = false;
+        // Note: this first one may not be needed but I'm paranoid
         if (!config.conf.contains(name)) {
-            config.conf[name]["recPath"] = "%ROOT%/recordings";
-            created = true;
+            config.conf[name] = json({});
         }
+        if (config.conf[name].contains("recPath")) {
             folderSelect.setPath(config.conf[name]["recPath"]);
-        config.release(created);
+        }
+        if (config.conf[name].contains("brokenModulation")) {
+            brokenModulation = config.conf[name]["brokenModulation"];
+        }
+        config.release();
 
         vfo = sigpath::vfoManager.createVFO(name, ImGui::WaterfallVFO::REF_CENTER, 0, 150000, INPUT_SAMPLE_RATE, 150000, 150000, true);
-        demod.init(vfo->output, 72000.0f, INPUT_SAMPLE_RATE, 33, 0.6f, 0.1f, 0.005f, 1e-6, 0.01);
+        demod.init(vfo->output, 72000.0f, INPUT_SAMPLE_RATE, 33, 0.6f, 0.1f, 0.005f, brokenModulation, 1e-6, 0.01);
         split.init(&demod.out);
         split.bindStream(&symSinkStream);
         split.bindStream(&sinkStream);
@@ -132,7 +136,7 @@ private:
         ImGui::SetNextItemWidth(menuWidth);
         _this->constDiagram.draw();
 
-        if (_this->folderSelect.render("##meteor-recorder-" + _this->name)) {
+        if (_this->folderSelect.render("##meteor_rec" + _this->name)) {
             if (_this->folderSelect.pathIsValid()) {
                 config.acquire();
                 config.conf[_this->name]["recPath"] = _this->folderSelect.path;
@@ -140,16 +144,23 @@ private:
             }
         }
 
+        if (ImGui::Checkbox(CONCAT("Broken modulation##meteor_rec", _this->name), &_this->brokenModulation)) {
+            _this->demod.setBrokenModulation(_this->brokenModulation);
+            config.acquire();
+            config.conf[_this->name]["brokenModulation"] = _this->brokenModulation;
+            config.release(true);
+        }
+
         if (!_this->folderSelect.pathIsValid() && _this->enabled) { style::beginDisabled(); }
 
         if (_this->recording) {
-            if (ImGui::Button(CONCAT("Stop##_recorder_rec_", _this->name), ImVec2(menuWidth, 0))) {
+            if (ImGui::Button(CONCAT("Stop##meteor_rec_", _this->name), ImVec2(menuWidth, 0))) {
                 _this->stopRecording();
             }
             ImGui::TextColored(ImVec4(1.0f, 0.0f, 0.0f, 1.0f), "Recording %.2fMB", (float)_this->dataWritten / 1000000.0f);
         }
         else {
-            if (ImGui::Button(CONCAT("Record##_recorder_rec_", _this->name), ImVec2(menuWidth, 0))) {
+            if (ImGui::Button(CONCAT("Record##meteor_rec_", _this->name), ImVec2(menuWidth, 0))) {
                 _this->startRecording();
             }
             ImGui::TextUnformatted("Idle --.--MB");
@@ -216,7 +227,7 @@ private:
 
     // DSP Chain
     VFOManager::VFO* vfo;
-    dsp::demod::PSK<4> demod;
+    dsp::demod::Meteor demod;
     dsp::routing::Splitter<dsp::complex_t> split;
 
     dsp::stream<dsp::complex_t> symSinkStream;
@@ -233,6 +244,7 @@ private:
     bool recording = false;
     uint64_t dataWritten = 0;
     std::ofstream recFile;
+    bool brokenModulation = false;
 
     int8_t* writeBuffer;
 };

decoder_modules/meteor_demodulator/src/meteor_costas.h

@@ -0,0 +1,60 @@
+#pragma once
+#include <dsp/loop/pll.h>
+#include <dsp/math/step.h>
+
+namespace dsp::loop {
+    class MeteorCostas : public PLL {
+        using base_type = PLL;
+    public:
+        MeteorCostas() {}
+
+        MeteorCostas(stream<complex_t>* in, double bandwidth, bool brokenModulation, double initPhase = 0.0, double initFreq = 0.0, double minFreq = -FL_M_PI, double maxFreq = FL_M_PI) { init(in, bandwidth, brokenModulation, initFreq, initPhase, minFreq, maxFreq); }
+
+        void init(stream<complex_t>* in, double bandwidth, bool brokenModulation, double initPhase = 0.0, double initFreq = 0.0, double minFreq = -FL_M_PI, double maxFreq = FL_M_PI) {
+            _broken = brokenModulation;
+            base_type::init(in, bandwidth, initPhase, initFreq, minFreq, maxFreq);
+        }
+
+        void setBrokenModulation(bool enabled) {
+            assert(base_type::_block_init);
+            std::lock_guard<std::recursive_mutex> lck(base_type::ctrlMtx);
+            _broken = enabled;
+        }
+
+        inline int process(int count, complex_t* in, complex_t* out) {
+            for (int i = 0; i < count; i++) {
+                out[i] = in[i] * math::phasor(-pcl.phase);
+                pcl.advance(errorFunction(out[i]));
+            }
+            return count;
+        }
+
+    protected:
+        inline float errorFunction(complex_t val) {
+            float err;
+            if (_broken) {
+                const float PHASE1 = 0.47439988279190737;
+                const float PHASE2 = 2.1777839908413044;
+                const float PHASE3 = 3.8682349942715186;
+                const float PHASE4 = -0.29067248091319986;
+
+                float phase = val.phase();
+                float dp1 = math::normPhaseDiff(phase - PHASE1);
+                float dp2 = math::normPhaseDiff(phase - PHASE2);
+                float dp3 = math::normPhaseDiff(phase - PHASE3);
+                float dp4 = math::normPhaseDiff(phase - PHASE4);
+                float lowest = dp1;
+                if (fabsf(dp2) < fabsf(lowest)) { lowest = dp2; }
+                if (fabsf(dp3) < fabsf(lowest)) { lowest = dp3; }
+                if (fabsf(dp4) < fabsf(lowest)) { lowest = dp4; }
+                err = lowest * val.amplitude();
+            }
+            else {
+                err = (math::step(val.re) * val.im) - (math::step(val.im) * val.re);
+            }
+            return std::clamp<float>(err, -1.0f, 1.0f);
+        }
+
+        bool _broken;
+    };
+}

decoder_modules/meteor_demodulator/src/meteor_demod.h

@@ -0,0 +1,176 @@
+#pragma once
+#include <dsp/taps/root_raised_cosine.h>
+#include <dsp/filter/fir.h>
+#include <dsp/loop/fast_agc.h>
+#include "meteor_costas.h"
+#include <dsp/clock_recovery/mm.h>
+
+namespace dsp::demod {
+    class Meteor : public Processor<complex_t, complex_t> {
+        using base_type = Processor<complex_t, complex_t>;
+    public:
+        Meteor() {}
+
+        Meteor(stream<complex_t>* in, double symbolrate, double samplerate, int rrcTapCount, double rrcBeta, double agcRate, double costasBandwidth, bool brokenModulation, double omegaGain, double muGain, double omegaRelLimit = 0.01) {
+            init(in, symbolrate, samplerate, rrcTapCount, rrcBeta, agcRate, costasBandwidth, brokenModulation, omegaGain, muGain);
+        }
+
+        ~Meteor() {
+            if (!base_type::_block_init) { return; }
+            base_type::stop();
+            taps::free(rrcTaps);
+        }
+
+        void init(stream<complex_t>* in, double symbolrate, double samplerate, int rrcTapCount, double rrcBeta, double agcRate, double costasBandwidth, bool brokenModulation, double omegaGain, double muGain, double omegaRelLimit = 0.01) {
+            _symbolrate = symbolrate;
+            _samplerate = samplerate;
+            _rrcTapCount = rrcTapCount;
+            _rrcBeta = rrcBeta;
+            
+            rrcTaps = taps::rootRaisedCosine<float>(_rrcTapCount, _rrcBeta, _symbolrate, _samplerate);
+            rrc.init(NULL, rrcTaps);
+            agc.init(NULL, 1.0, 10e6, agcRate);
+            costas.init(NULL, costasBandwidth, brokenModulation);
+            recov.init(NULL, _samplerate / _symbolrate,  omegaGain, muGain, omegaRelLimit);
+
+            rrc.out.free();
+            agc.out.free();
+            costas.out.free();
+            recov.out.free();
+
+            base_type::init(in);
+        }
+
+        void setSymbolrate(double symbolrate) {
+            assert(base_type::_block_init);
+            std::lock_guard<std::recursive_mutex> lck(base_type::ctrlMtx);
+            base_type::tempStop();
+            _symbolrate = symbolrate;
+            taps::free(rrcTaps);
+            rrcTaps = taps::rootRaisedCosine<float>(_rrcTapCount, _rrcBeta, _symbolrate, _samplerate);
+            rrc.setTaps(rrcTaps);
+            recov.setOmega(_samplerate / _symbolrate);
+            base_type::tempStart();
+        }
+
+        void setSamplerate(double samplerate) {
+            assert(base_type::_block_init);
+            std::lock_guard<std::recursive_mutex> lck(base_type::ctrlMtx);
+            base_type::tempStop();
+            _samplerate = samplerate;
+            taps::free(rrcTaps);
+            rrcTaps = taps::rootRaisedCosine<float>(_rrcTapCount, _rrcBeta, _symbolrate, _samplerate);
+            rrc.setTaps(rrcTaps);
+            recov.setOmega(_samplerate / _symbolrate);
+            base_type::tempStart();
+        }
+
+        void setRRCParams(int rrcTapCount, double rrcBeta) {
+            assert(base_type::_block_init);
+            std::lock_guard<std::recursive_mutex> lck(base_type::ctrlMtx);
+            base_type::tempStop();
+            _rrcTapCount = rrcTapCount;
+            _rrcBeta = rrcBeta;
+            taps::free(rrcTaps);
+            rrcTaps = taps::rootRaisedCosine<float>(_rrcTapCount, _rrcBeta, _symbolrate, _samplerate);
+            rrc.setTaps(rrcTaps);
+            base_type::tempStart();
+        }
+
+        void setRRCTapCount(int rrcTapCount) {
+            setRRCParams(rrcTapCount, _rrcBeta);
+        }
+
+        void setRRCBeta(int rrcBeta) {
+            setRRCParams(_rrcTapCount, rrcBeta);
+        }
+
+        void setAGCRate(double agcRate) {
+            assert(base_type::_block_init);
+            std::lock_guard<std::recursive_mutex> lck(base_type::ctrlMtx);
+            agc.setRate(agcRate);
+        }
+
+        void setCostasBandwidth(double bandwidth) {
+            assert(base_type::_block_init);
+            std::lock_guard<std::recursive_mutex> lck(base_type::ctrlMtx);
+            costas.setBandwidth(bandwidth);
+        }
+
+        void setMMParams(double omegaGain, double muGain, double omegaRelLimit = 0.01) {
+            assert(base_type::_block_init);
+            std::lock_guard<std::recursive_mutex> lck(base_type::ctrlMtx);
+            recov.setOmegaGain(omegaGain);
+            recov.setMuGain(muGain);
+            recov.setOmegaRelLimit(omegaRelLimit);
+        }
+
+        void setOmegaGain(double omegaGain) {
+            assert(base_type::_block_init);
+            std::lock_guard<std::recursive_mutex> lck(base_type::ctrlMtx);
+            recov.setOmegaGain(omegaGain);
+        }
+
+        void setMuGain(double muGain) {
+            assert(base_type::_block_init);
+            std::lock_guard<std::recursive_mutex> lck(base_type::ctrlMtx);
+            recov.setMuGain(muGain);
+        }
+
+        void setOmegaRelLimit(double omegaRelLimit) {
+            assert(base_type::_block_init);
+            std::lock_guard<std::recursive_mutex> lck(base_type::ctrlMtx);
+            recov.setOmegaRelLimit(omegaRelLimit);
+        }
+
+        void setBrokenModulation(bool enabled) {
+            assert(base_type::_block_init);
+            std::lock_guard<std::recursive_mutex> lck(base_type::ctrlMtx);
+            costas.setBrokenModulation(enabled);
+        }
+
+        void reset() {
+            assert(base_type::_block_init);
+            std::lock_guard<std::recursive_mutex> lck(base_type::ctrlMtx);
+            base_type::tempStop();
+            rrc.reset();
+            agc.reset();
+            costas.reset();
+            recov.reset();
+            base_type::tempStart();
+        }
+
+        inline int process(int count, const complex_t* in, complex_t* out) {
+            rrc.process(count, in, out);
+            agc.process(count, out, out);
+            costas.process(count, out, out);
+            return recov.process(count, out, out);
+        }
+
+        int run() {
+            int count = base_type::_in->read();
+            if (count < 0) { return -1; }
+
+            int outCount = process(count, base_type::_in->readBuf, base_type::out.writeBuf);
+
+            // Swap if some data was generated
+            base_type::_in->flush();
+            if (outCount) {
+                if (!base_type::out.swap(outCount)) { return -1; }
+            }
+            return outCount;
+        }
+
+    protected:
+        double _symbolrate;
+        double _samplerate;
+        int _rrcTapCount;
+        double _rrcBeta;
+
+        tap<float> rrcTaps;
+        filter::FIR<complex_t, float> rrc;
+        loop::FastAGC<complex_t> agc;
+        loop::MeteorCostas costas;
+        clock_recovery::MM<complex_t> recov;
+    };
+}