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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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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() {}