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CPU performance improvements for IF noise reduction

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This commit is contained in:
AlexandreRouma 2021-12-12 21:55:00 +01:00
parent cee0f75870
commit b4924a8fae
1 changed files with 14 additions and 6 deletions
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20
core/src/dsp/noise_reduction.h
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@ -22,6 +22,7 @@ namespace dsp {
fftwf_free(fft_window);
fftwf_free(amp_buf);
fftwf_free(fft_cout);
fftwf_free(fft_cin);
fftwf_free(fft_fcout);
}
@ -34,6 +35,7 @@ namespace dsp {
fft_window = (float*)fftwf_malloc(sizeof(float)*_tapCount);
amp_buf = (float*)fftwf_malloc(sizeof(float)*_tapCount);
fft_cout = (complex_t*)fftwf_malloc(sizeof(complex_t)*_tapCount);
fft_cin = (complex_t*)fftwf_malloc(sizeof(complex_t)*_tapCount);
fft_fcout = (complex_t*)fftwf_malloc(sizeof(complex_t)*_tapCount);
delay_start = &delay[_tapCount];
@ -41,6 +43,7 @@ namespace dsp {
memset(fft_in, 0, sizeof(complex_t)*_tapCount);
memset(amp_buf, 0, sizeof(float)*_tapCount);
memset(fft_cout, 0, sizeof(complex_t)*_tapCount);
memset(fft_cin, 0, sizeof(complex_t)*_tapCount);
memset(fft_fcout, 0, sizeof(complex_t)*_tapCount);
for (int i = 0; i < _tapCount; i++) {
@ -48,7 +51,7 @@ namespace dsp {
}
forwardPlan = fftwf_plan_dft_1d(_tapCount, (fftwf_complex*)fft_in, (fftwf_complex*)fft_cout, FFTW_FORWARD, FFTW_ESTIMATE);
backwardPlan = fftwf_plan_dft_1d(_tapCount, (fftwf_complex*)fft_cout, (fftwf_complex*)fft_fcout, FFTW_BACKWARD, FFTW_ESTIMATE);
backwardPlan = fftwf_plan_dft_1d(_tapCount, (fftwf_complex*)fft_cin, (fftwf_complex*)fft_fcout, FFTW_BACKWARD, FFTW_ESTIMATE);
generic_block<FMIFNoiseReduction>::registerInput(_in);
generic_block<FMIFNoiseReduction>::registerOutput(&out);
@ -80,6 +83,7 @@ namespace dsp {
fftwf_free(fft_window);
fftwf_free(amp_buf);
fftwf_free(fft_cout);
fftwf_free(fft_cin);
fftwf_free(fft_fcout);
delay = (complex_t*)fftwf_malloc(sizeof(complex_t)*STREAM_BUFFER_SIZE);
@ -87,6 +91,7 @@ namespace dsp {
fft_window = (float*)fftwf_malloc(sizeof(float)*_tapCount);
amp_buf = (float*)fftwf_malloc(sizeof(float)*_tapCount);
fft_cout = (complex_t*)fftwf_malloc(sizeof(complex_t)*_tapCount);
fft_cin = (complex_t*)fftwf_malloc(sizeof(complex_t)*_tapCount);
fft_fcout = (complex_t*)fftwf_malloc(sizeof(complex_t)*_tapCount);
delay_start = &delay[_tapCount];
@ -94,6 +99,7 @@ namespace dsp {
memset(fft_in, 0, sizeof(complex_t)*_tapCount);
memset(amp_buf, 0, sizeof(float)*_tapCount);
memset(fft_cout, 0, sizeof(complex_t)*_tapCount);
memset(fft_cin, 0, sizeof(complex_t)*_tapCount);
memset(fft_fcout, 0, sizeof(complex_t)*_tapCount);
for (int i = 0; i < _tapCount; i++) {
@ -101,7 +107,7 @@ namespace dsp {
}
forwardPlan = fftwf_plan_dft_1d(_tapCount, (fftwf_complex*)fft_in, (fftwf_complex*)fft_cout, FFTW_FORWARD, FFTW_ESTIMATE);
backwardPlan = fftwf_plan_dft_1d(_tapCount, (fftwf_complex*)fft_cout, (fftwf_complex*)fft_fcout, FFTW_BACKWARD, FFTW_ESTIMATE);
backwardPlan = fftwf_plan_dft_1d(_tapCount, (fftwf_complex*)fft_cin, (fftwf_complex*)fft_fcout, FFTW_BACKWARD, FFTW_ESTIMATE);
spdlog::info("FM IF Noise reduction set to {0} taps", _tapCount);
@ -143,14 +149,15 @@ namespace dsp {
volk_32fc_magnitude_32f(amp_buf, (lv_32fc_t*)fft_cout, _tapCount);
volk_32f_index_max_32u(&idx, amp_buf, _tapCount);
for (int j = 0; j < _tapCount; j++) {
if (j == idx) { continue; }
fft_cout[j] = {0, 0};
}
// Keep only the bin of highest amplitude
fft_cin[idx] = fft_cout[idx];
// Do reverse FFT and get first element
fftwf_execute(backwardPlan);
out.writeBuf[i] = fft_fcout[_tapCount/2];
// Reset the input buffer
fft_cin[idx] = {0, 0};
}
volk_32f_s32f_multiply_32f((float*)out.writeBuf, (float*)out.writeBuf, 1.0f/(float)_tapCount, count * 2);
@ -178,6 +185,7 @@ namespace dsp {
float* amp_buf;
complex_t* delay_start;
complex_t* fft_cout;
complex_t* fft_cin;
complex_t* fft_fcout;
int _tapCount;