kopia lustrzana https://github.com/Dsplib/libdspl-2.0
57 wiersze
1.5 KiB
C
57 wiersze
1.5 KiB
C
/*
|
|
* Copyright (c) 2015-2019 Sergey Bakhurin
|
|
* Digital Signal Processing Library [http://dsplib.org]
|
|
*
|
|
* This file is part of libdspl-2.0.
|
|
*
|
|
* is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* DSPL 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 for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with Foobar. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include "dspl.h"
|
|
|
|
|
|
|
|
|
|
#ifdef DOXYGEN_ENGLISH
|
|
|
|
#endif
|
|
#ifdef DOXYGEN_RUSSIAN
|
|
|
|
#endif
|
|
int DSPL_API low2bp(double* b, double* a, int ord,
|
|
double w0, double wpl, double wph,
|
|
double* beta, double* alpha)
|
|
{
|
|
|
|
double num[3] = {0.0, 0.0, 1.0};
|
|
double den[3] = {0.0, 0.0, 0.0};
|
|
|
|
if(!b || !a || !beta || !alpha)
|
|
return ERROR_PTR;
|
|
if(ord < 1)
|
|
return ERROR_FILTER_ORD;
|
|
if(w0 <= 0.0 || wpl <= 0.0 || wph <= 0.0 || wph <= wpl)
|
|
return ERROR_FILTER_FT;
|
|
|
|
num[0] = (wph * wpl) / (w0 * w0);
|
|
den[1] = (wph - wpl) / w0;
|
|
|
|
return ratcompos(b, a, ord, num, den, 2, beta, alpha);
|
|
}
|
|
|
|
|