mirror/SDRPlusPlus
0
0
Fork 0
mirror of https://github.com/AlexandreRouma/SDRPlusPlus.git synced 2024-11-10 12:47:40 +01:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

Fixed some stuff 2

Browse Source
This commit is contained in:
Ryzerth 2021-02-20 15:35:39 +01:00
parent 89d0f6b761
commit 044f8cbffd
1 changed files with 0 additions and 76 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
core/src/dsp/window.h
View File

@ -10,12 +10,6 @@ namespace dsp {
virtual void createTaps(float* taps, int tapCount, float factor = 1.0f) {}
};
class generic_complex_window {
public:
virtual int getTapCount() { return -1; }
virtual void createTaps(dsp::complex_t* taps, int tapCount, float factor = 1.0f) {}
};
class BlackmanWindow : public filter_window::generic_window {
public:
BlackmanWindow() {}
@ -149,75 +143,5 @@ namespace dsp {
float _cutoff, _transWidth, _sampleRate, _offset;
};
class BlackmanBandpassWindow : public filter_window::generic_complex_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(dsp::complex_t* 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;
};
}
}