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Ryzerth 2021-04-16 19:53:47 +02:00
parent 098f09844b
commit b16ab3f0c0
9 changed files with 70 additions and 246 deletions
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144
core/src/dsp/demodulator.h
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@ -7,6 +7,7 @@
#include <spdlog/spdlog.h>
#include <dsp/pll.h>
#include <dsp/clock_recovery.h>
#include <dsp/math.h>
#define FAST_ATAN2_COEF1 FL_M_PI / 4.0f
#define FAST_ATAN2_COEF2 3.0f * FAST_ATAN2_COEF1
@ -186,149 +187,6 @@ namespace dsp {
};
class StereoFMDemod : public generic_block<StereoFMDemod> {
public:
StereoFMDemod() {}
StereoFMDemod(stream<complex_t>* in, float sampleRate, float deviation) { init(in, sampleRate, deviation); }
~StereoFMDemod() {
generic_block<StereoFMDemod>::stop();
delete[] doubledPilot;
delete[] a_minus_b;
delete[] a_out;
delete[] b_out;
}
void init(stream<complex_t>* in, float sampleRate, float deviation) {
_sampleRate = sampleRate;
doubledPilot = new float[STREAM_BUFFER_SIZE];
a_minus_b = new float[STREAM_BUFFER_SIZE];
a_out = new float[STREAM_BUFFER_SIZE];
b_out = new float[STREAM_BUFFER_SIZE];
fmDemod.init(in, sampleRate, deviation);
split.init(&fmDemod.out);
split.bindStream(&filterInput);
split.bindStream(&decodeInput);
// Filter init
win.init(1000, 1000, 19000, sampleRate);
filter.init(&filterInput, &win);
agc.init(&filter.out, 20.0f, sampleRate);
generic_block<StereoFMDemod>::registerInput(&decodeInput);
generic_block<StereoFMDemod>::registerOutput(&out);
}
void setInput(stream<complex_t>* in) {
std::lock_guard<std::mutex> lck(generic_block<StereoFMDemod>::ctrlMtx);
generic_block<StereoFMDemod>::tempStop();
fmDemod.setInput(in);
generic_block<StereoFMDemod>::tempStart();
}
void setSampleRate(float sampleRate) {
std::lock_guard<std::mutex> lck(generic_block<StereoFMDemod>::ctrlMtx);
generic_block<StereoFMDemod>::tempStop();
_sampleRate = sampleRate;
fmDemod.setSampleRate(sampleRate);
win.setSampleRate(_sampleRate);
filter.updateWindow(&win);
generic_block<StereoFMDemod>::tempStart();
}
float getSampleRate() {
return _sampleRate;
}
void setDeviation(float deviation) {
std::lock_guard<std::mutex> lck(generic_block<StereoFMDemod>::ctrlMtx);
generic_block<StereoFMDemod>::tempStop();
fmDemod.setDeviation(deviation);
generic_block<StereoFMDemod>::tempStart();
}
float getDeviation() {
return fmDemod.getDeviation();
}
int run() {
count = decodeInput.read();
if (count < 0) { return -1; }
countFilter = agc.out.read();
if (countFilter < 0) { return -1; }
volk_32f_x2_multiply_32f(doubledPilot, agc.out.readBuf, agc.out.readBuf, count);
volk_32f_x2_multiply_32f(a_minus_b, decodeInput.readBuf, doubledPilot, count);
volk_32f_x2_add_32f(a_out, decodeInput.readBuf, a_minus_b, count);
volk_32f_x2_subtract_32f(b_out, decodeInput.readBuf, a_minus_b, count);
decodeInput.flush();
agc.out.flush();
volk_32f_x2_interleave_32fc((lv_32fc_t*)out.writeBuf, a_out, b_out, count);
if (!out.swap(count)) { return -1; }
return count;
}
void start() {
std::lock_guard<std::mutex> lck(generic_block<StereoFMDemod>::ctrlMtx);
if (generic_block<StereoFMDemod>::running) {
return;
}
generic_block<StereoFMDemod>::running = true;
generic_block<StereoFMDemod>::doStart();
fmDemod.start();
split.start();
filter.start();
agc.start();
}
void stop() {
std::lock_guard<std::mutex> lck(generic_block<StereoFMDemod>::ctrlMtx);
if (!generic_block<StereoFMDemod>::running) {
return;
}
fmDemod.stop();
split.stop();
filter.stop();
agc.stop();
generic_block<StereoFMDemod>::doStop();
generic_block<StereoFMDemod>::running = false;
}
stream<stereo_t> out;
private:
int count;
int countFilter;
float _sampleRate;
FloatFMDemod fmDemod;
Splitter<float> split;
// Pilot tone filtering
stream<float> filterInput;
FIR<float> filter;
filter_window::BlackmanBandpassWindow win;
AGC agc;
stream<float> decodeInput;
// Buffers
float* doubledPilot;
float* a_minus_b;
float* a_out;
float* b_out;
};
class AMDemod : public generic_block<AMDemod> {
public:
AMDemod() {}

1
core/src/dsp/pll.h
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@ -3,6 +3,7 @@
#include <dsp/interpolation_taps.h>
#include <math.h>
#include <dsp/utils/macros.h>
#include <dsp/math.h>
namespace dsp {
template <int ORDER>

1
core/src/dsp/processing.h
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@ -4,6 +4,7 @@
#include <spdlog/spdlog.h>
#include <string.h>
#include <stdint.h>
#include <dsp/math.h>
namespace dsp {
template <class T>

69
core/src/dsp/resampling.h
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@ -3,6 +3,7 @@
#include <dsp/window.h>
#include <numeric>
#include <string.h>
#include <dsp/math.h>
namespace dsp {
template <class T>
@ -192,11 +193,22 @@ namespace dsp {
public:
PowerDecimator() {}
PowerDecimator(stream<complex_t>* in, unsigned int power) { init(in, power); }
PowerDecimator(stream<complex_t>* in, int power, int tapCount) { init(in, power, tapCount); }
void init(stream<complex_t>* in, unsigned int power) {
void init(stream<complex_t>* in, int power, int tapCount) {
_in = in;
_power = power;
_tapCount = tapCount;
// Allocate buffers
for (int i = 0; i < _power; i++) {
buffers[i] = new complex_t[STREAM_BUFFER_SIZE / (i+1)];
bufferStart[i] = &buffers[i][_tapCount - 1];
}
// Create taps
genHalfbandTaps();
generic_block<PowerDecimator>::registerInput(_in);
generic_block<PowerDecimator>::registerOutput(&out);
}
@ -221,39 +233,42 @@ namespace dsp {
int count = _in->read();
if (count < 0) { return -1; }
if (_power == 0) {
memcpy(out.writeBuf, _in->readBuf, count * sizeof(complex_t));
}
else if (_power == 1) {
for (int j = 0; j < count; j += 2) {
out.writeBuf[j / 2].re = (_in->readBuf[j].re + _in->readBuf[j + 1].re) * 0.5f;
out.writeBuf[j / 2].im = (_in->readBuf[j].im + _in->readBuf[j + 1].im) * 0.5f;
}
count /= 2;
}
_in->flush();
if (_power > 1) {
for (int i = 1; i < _power; i++) {
for (int j = 0; j < count; j += 2) {
out.writeBuf[j / 2].re = (_in->readBuf[j].re + _in->readBuf[j + 1].re) * 0.5f;
out.writeBuf[j / 2].im = (_in->readBuf[j].im + _in->readBuf[j + 1].im) * 0.5f;
}
count /= 2;
}
}
if (!out.swap(count)) { return -1; }
return count;
}
stream<complex_t> out;
private:
unsigned int _power = 0;
void genHalfbandTaps() {
if (taps != NULL) { delete[] taps; }
taps = new float[_tapCount];
// Using Blackman-harris windows
int half = _tapCount / 2;
for (int i = 0; i < _tapCount; i++) {
taps[i] = sinc((FL_M_PI / 2.0f) * (i-half)) * blackmanHarrisWin(i, _tapCount - 1);
printf("%f\n", taps[i]);
}
}
inline float sinc(float x) {
return ((x == 0) ? 1.0f : (sinf(x)/x)) / FL_M_PI;
}
inline float blackmanHarrisWin(float n, float N) {
return 0.35875f - (0.48829f*cosf(2.0f*FL_M_PI*(n/N))) + (0.14128f*cosf(4.0f*FL_M_PI*(n/N))) - (0.01168f*cosf(6.0f*FL_M_PI*(n/N)));
}
int _power = 0;
int _tapCount = 31;
stream<complex_t>* _in;
// Buffer lists, sets max decimation to 2^32
complex_t* buffers[32];
complex_t* bufferStart[32];
float* taps = NULL;
};
}

1
core/src/dsp/source.h
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@ -1,5 +1,6 @@
#pragma once
#include <dsp/block.h>
#include <dsp/math.h>
namespace dsp {
class SineSource : public generic_block<SineSource> {

3
core/src/dsp/types.h
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@ -1,7 +1,6 @@
#pragma once
#include <math.h>
#define FL_M_PI 3.1415926535f
#include <dsp/utils/math.h>
namespace dsp {
struct complex_t {

91
core/src/dsp/window.h
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@ -1,6 +1,7 @@
#pragma once
#include <dsp/block.h>
#include <dsp/types.h>
#include <dsp/utils/window_functions.h>
namespace dsp {
namespace filter_window {
@ -50,6 +51,25 @@ namespace dsp {
}
void createTaps(float* taps, int tapCount, float factor = 1.0f) {
// // Calculate cuttoff frequency
// float omega = 2.0f * FL_M_PI * (_cutoff / _sampleRate);
// if (omega > FL_M_PI) { omega = FL_M_PI; }
// // Generate taps
// float val;
// float sum = 0.0f;
// for (int i = 0; i < tapCount; i++) {
// val = math::sinc(omega, i-(tapCount/2), FL_M_PI) * window_function::blackman(i, tapCount - 1);
// taps[i] = val;
// sum += val;
// }
// // Normalize taps and multiply by supplied factor
// for (int i = 0; i < tapCount; i++) {
// taps[i] *= factor;
// taps[i] /= sum;
// }
float fc = _cutoff / _sampleRate;
if (fc > 1.0f) {
fc = 1.0f;
@ -73,79 +93,8 @@ namespace dsp {
float _cutoff, _transWidth, _sampleRate;
};
class BlackmanBandpassWindow : public filter_window::generic_window {
public:
BlackmanBandpassWindow() {}
BlackmanBandpassWindow(float cutoff, float transWidth, float offset, float sampleRate) { init(cutoff, transWidth, offset, sampleRate); }
void init(float cutoff, float transWidth, float offset, float sampleRate) {
_cutoff = cutoff;
_transWidth = transWidth;
_offset = offset;
_sampleRate = sampleRate;
}
void setSampleRate(float sampleRate) {
_sampleRate = sampleRate;
}
void setCutoff(float cutoff) {
_cutoff = cutoff;
}
void setTransWidth(float transWidth) {
_transWidth = transWidth;
}
void setOffset(float offset) {
_offset = offset;
}
int getTapCount() {
float fc = _cutoff / _sampleRate;
if (fc > 1.0f) {
fc = 1.0f;
}
int _M = 4.0f / (_transWidth / _sampleRate);
if (_M < 4) {
_M = 4;
}
if (_M % 2 == 0) { _M++; }
return _M;
}
void createTaps(float* taps, int tapCount, float factor = 1.0f) {
float fc = _cutoff / _sampleRate;
if (fc > 1.0f) {
fc = 1.0f;
}
float tc = tapCount;
float sum = 0.0f;
float val;
for (int i = 0; i < tapCount; i++) {
val = (sin(2.0f * FL_M_PI * fc * ((float)i - (tc / 2))) / ((float)i - (tc / 2))) *
(0.42f - (0.5f * cos(2.0f * FL_M_PI / tc)) + (0.8f * cos(4.0f * FL_M_PI / tc)));
taps[i] = val; // tapCount - i - 1
sum += val;
}
for (int i = 0; i < tapCount; i++) {
taps[i] *= cos(2.0f * (_offset / _sampleRate) * FL_M_PI * (float)i);
taps[i] *= factor;
taps[i] /= sum;
}
}
private:
float _cutoff, _transWidth, _sampleRate, _offset;
};
}
class RRCTaps : public filter_window::generic_window {
public:
RRCTaps() {}

4
core/src/gui/widgets/waterfall.cpp
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@ -69,7 +69,7 @@ double freq_ranges[] = {
10000000.0, 20000000.0, 25000000.0, 50000000.0
};
double findBestRange(double bandwidth, int maxSteps) {
inline double findBestRange(double bandwidth, int maxSteps) {
for (int i = 0; i < 32; i++) {
if (bandwidth / freq_ranges[i] < (double)maxSteps) {
return freq_ranges[i];
@ -78,7 +78,7 @@ double findBestRange(double bandwidth, int maxSteps) {
return 50000000.0;
}
void printAndScale(double freq, char* buf) {
inline void printAndScale(double freq, char* buf) {
double freqAbs = fabs(freq);
if (freqAbs < 1000) {
sprintf(buf, "%.6g", freq);

2
rx888_source/src/main.cpp
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@ -5,7 +5,7 @@
#include <signal_path/signal_path.h>
#include <core.h>
#include <gui/style.h>
#include <dsp/math.h>
#include <openFX3.h>
#include <Si5351.h>