2018-05-20 10:42:14 +02:00
|
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
// Copyright (C) 2018 F4EXB //
|
|
|
|
|
// written by Edouard Griffiths //
|
|
|
|
|
// //
|
|
|
|
|
// FFT based cross correlation //
|
|
|
|
|
// //
|
|
|
|
|
// See: http://liquidsdr.org/blog/pll-howto/ //
|
|
|
|
|
// Fixed filter registers saturation //
|
|
|
|
|
// Added order for PSK locking. This brilliant idea actually comes from this //
|
|
|
|
|
// post: https://www.dsprelated.com/showthread/comp.dsp/36356-1.php //
|
|
|
|
|
// //
|
|
|
|
|
// This program is free software; you can redistribute it and/or modify //
|
|
|
|
|
// it under the terms of the GNU General Public License as published by //
|
|
|
|
|
// the Free Software Foundation as version 3 of the License, or //
|
2019-04-11 14:32:15 +02:00
|
|
|
// (at your option) any later version. //
|
2018-05-20 10:42:14 +02:00
|
|
|
// //
|
|
|
|
|
// This program is distributed in the hope that it will be useful, //
|
|
|
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
|
|
|
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
|
|
|
|
|
// GNU General Public License V3 for more details. //
|
|
|
|
|
// //
|
|
|
|
|
// You should have received a copy of the GNU General Public License //
|
|
|
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
|
|
|
|
#ifndef SDRBASE_DSP_FFTCORR_H_
|
|
|
|
|
#define SDRBASE_DSP_FFTCORR_H_
|
|
|
|
|
|
|
|
|
|
#include <complex>
|
|
|
|
|
#include "gfft.h"
|
|
|
|
|
#include "export.h"
|
|
|
|
|
|
|
|
|
|
class SDRBASE_API fftcorr {
|
|
|
|
|
public:
|
|
|
|
|
typedef std::complex<float> cmplx;
|
|
|
|
|
fftcorr(int len);
|
|
|
|
|
~fftcorr();
|
|
|
|
|
|
|
|
|
|
int run(const cmplx& inA, const cmplx* inB, cmplx **out); //!< if inB = 0 then run auto-correlation
|
2018-05-20 18:17:53 +02:00
|
|
|
const cmplx& run(const cmplx& inA, const cmplx* inB);
|
2018-05-20 10:42:14 +02:00
|
|
|
|
|
|
|
|
private:
|
|
|
|
|
void init_fft();
|
|
|
|
|
int flen; //!< FFT length
|
2018-05-20 20:23:41 +02:00
|
|
|
int flen2; //!< half FFT length
|
2018-05-20 10:42:14 +02:00
|
|
|
g_fft<float> *fftA;
|
|
|
|
|
g_fft<float> *fftB;
|
|
|
|
|
cmplx *dataA; // from A input
|
|
|
|
|
cmplx *dataB; // from B input
|
|
|
|
|
cmplx *dataBj; // conjugate of B
|
|
|
|
|
cmplx *dataP; // product of A with conjugate of B
|
|
|
|
|
int inptrA;
|
|
|
|
|
int inptrB;
|
2018-05-20 18:17:53 +02:00
|
|
|
int outptr;
|
2018-05-20 10:42:14 +02:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
#endif /* SDRBASE_DSP_FFTCORR_H_ */
|
