Mercurial > hg > audiostuff
view spandsp-0.0.3/spandsp-0.0.3/src/spandsp/complex_filters.h @ 5:f762bf195c4b
import spandsp-0.0.3
author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
---|---|
date | Fri, 25 Jun 2010 16:00:21 +0200 |
parents | |
children |
line wrap: on
line source
/* * SpanDSP - a series of DSP components for telephony * * complex_filters.h * * Written by Steve Underwood <steveu@coppice.org> * * Copyright (C) 2003 Steve Underwood * * All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2, as * published by the Free Software Foundation. * * 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 for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * $Id: complex_filters.h,v 1.6 2006/10/24 13:45:28 steveu Exp $ */ #if !defined(_COMPLEX_FILTERS_H_) #define _COMPLEX_FILTERS_H_ typedef struct filter_s filter_t; typedef float (*filter_step_func_t)(filter_t *fi, float x); typedef struct { int nz; int np; filter_step_func_t fsf; } fspec_t; struct filter_s { fspec_t *fs; float sum; int ptr; /* for moving average filters only */ float v[]; }; typedef struct { filter_t *ref; filter_t *imf; } cfilter_t; #ifdef __cplusplus extern "C" { #endif filter_t *filter_create(fspec_t *fs); void filter_delete(filter_t *fi); float filter_step(filter_t *fi, float x); cfilter_t *cfilter_create(fspec_t *fs); void cfilter_delete(cfilter_t *cfi); complexf_t cfilter_step(cfilter_t *cfi, const complexf_t *z); #ifdef __cplusplus } #endif #endif /*- End of file ------------------------------------------------------------*/