kopia lustrzana https://github.com/Dsplib/libdspl-2.0
94 wiersze
2.2 KiB
C
94 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 <string.h>
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#include <math.h>
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#include "dspl.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 freqs_cmplx(double* b, double* a, int ord,
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complex_t* s, int n, complex_t *h)
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{
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complex_t *bc = NULL;
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complex_t *ac = NULL;
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complex_t num, den;
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double mag;
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int k;
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int res;
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if(!b || !a || !s || !h)
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return ERROR_PTR;
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if(ord<0)
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return ERROR_FILTER_ORD;
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if(n<1)
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return ERROR_SIZE;
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bc = (complex_t*) malloc((ord+1) * sizeof(complex_t));
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res = re2cmplx(b, ord+1, bc);
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if( res!=RES_OK )
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goto exit_label;
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ac = (complex_t*) malloc((ord+1) * sizeof(complex_t));
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res = re2cmplx(a, ord+1, ac);
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if( res!=RES_OK )
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goto exit_label;
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for(k = 0; k < n; k++)
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{
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res = polyval_cmplx(bc, ord, s+k, 1, &num);
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if(res != RES_OK)
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goto exit_label;
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res = polyval_cmplx(ac, ord, s+k, 1, &den);
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if(res != RES_OK)
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goto exit_label;
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mag = ABSSQR(den);
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if(mag == 0.0)
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{
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res = ERROR_DIV_ZERO;
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goto exit_label;
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}
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mag = 1.0 / mag;
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RE(h[k]) = CMCONJRE(num, den) * mag;
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IM(h[k]) = CMCONJIM(num, den) * mag;
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}
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res = RES_OK;
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exit_label:
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if(bc)
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free(bc);
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if(ac)
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free(ac);
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return res;
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}
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