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FFT filter: SSB filter leave DC component by default in both USB and LSB. Option to remove DC in both

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This commit is contained in:
f4exb 2017-03-15 15:37:51 +01:00
parent 13455dfff8
commit f40d030e2e
2 changed files with 12 additions and 5 deletions
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15
sdrbase/dsp/fftfilt.cxx
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@ -199,7 +199,7 @@ int fftfilt::runFilt(const cmplx & in, cmplx **out)
} }
// Second version for single sideband // Second version for single sideband
int fftfilt::runSSB(const cmplx & in, cmplx **out, bool usb) int fftfilt::runSSB(const cmplx & in, cmplx **out, bool usb, bool getDC)
{ {
data[inptr++] = in; data[inptr++] = in;
if (inptr < flen2) if (inptr < flen2)
@ -208,17 +208,24 @@ int fftfilt::runSSB(const cmplx & in, cmplx **out, bool usb)
fft->ComplexFFT(data); fft->ComplexFFT(data);
// get or reject DC component
data[0] = getDC ? data[0]*filter[0] : 0;
// Discard frequencies for ssb // Discard frequencies for ssb
if ( usb ) if (usb)
for (int i = 0; i < flen2; i++) { {
for (int i = 1; i < flen2; i++) {
data[i] *= filter[i]; data[i] *= filter[i];
data[flen2 + i] = 0; data[flen2 + i] = 0;
} }
}
else else
for (int i = 0; i < flen2; i++) { {
for (int i = 1; i < flen2; i++) {
data[i] = 0; data[i] = 0;
data[flen2 + i] *= filter[flen2 + i]; data[flen2 + i] *= filter[flen2 + i];
} }
}
// in-place FFT: freqdata overwritten with filtered timedata // in-place FFT: freqdata overwritten with filtered timedata
fft->InverseComplexFFT(data); fft->InverseComplexFFT(data);

2
sdrbase/dsp/fftfilt.h
View File

@ -26,7 +26,7 @@ public:
int noFilt(const cmplx& in, cmplx **out); int noFilt(const cmplx& in, cmplx **out);
int runFilt(const cmplx& in, cmplx **out); int runFilt(const cmplx& in, cmplx **out);
int runSSB(const cmplx& in, cmplx **out, bool usb); int runSSB(const cmplx& in, cmplx **out, bool usb, bool getDC = true);
int runDSB(const cmplx& in, cmplx **out); int runDSB(const cmplx& in, cmplx **out);
protected: protected: