kopia lustrzana https://github.com/Dsplib/libdspl-2.0
86 wiersze
2.2 KiB
C
86 wiersze
2.2 KiB
C
/*
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* Copyright (c) 2015-2019 Sergey Bakhurin
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* Digital Signal Processing Library [http://dsplib.org]
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*
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* This file is part of libdspl-2.0.
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*
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* is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* DSPL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Foobar. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <float.h>
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#include "dspl.h"
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#include "dspl_internal.h"
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#ifdef DOXYGEN_ENGLISH
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#endif
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#ifdef DOXYGEN_RUSSIAN
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#endif
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int DSPL_API fft_abs_cmplx(complex_t* x, int n, fft_t* pfft,
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double fs, int flag,
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double* mag, double* freq)
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{
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int k, err = RES_OK;
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complex_t *X = NULL;
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if(!x || !pfft)
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return ERROR_PTR;
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if(n<1)
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return ERROR_SIZE;
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if(mag)
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{
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X = (complex_t*)malloc(n*sizeof(complex_t));
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err = fft_cmplx(x, n, pfft, X);
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if(err!=RES_OK)
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goto error_proc;
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for(k = 0; k < n; k++)
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mag[k] = ABS(X[k]);
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if(flag & DSPL_FLAG_FFT_SHIFT)
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{
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err = fft_shift(mag, n, mag);
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if(err!=RES_OK)
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goto error_proc;
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}
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}
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if(freq)
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{
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if(flag & DSPL_FLAG_FFT_SHIFT)
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if(n%2)
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err = linspace(-fs*0.5 + fs*0.5/(double)n,
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fs*0.5 - fs*0.5/(double)n,
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n, DSPL_SYMMETRIC, freq);
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else
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err = linspace(-fs*0.5, fs*0.5, n, DSPL_PERIODIC, freq);
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else
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err = linspace(0, fs, n, DSPL_PERIODIC, freq);
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}
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error_proc:
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if(X)
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free(X);
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return err;
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}
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