Mercurial > hg > audiostuff
comparison 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> |
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date | Fri, 25 Jun 2010 16:00:21 +0200 |
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4:26cd8f1ef0b1 | 5:f762bf195c4b |
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1 /* | |
2 * SpanDSP - a series of DSP components for telephony | |
3 * | |
4 * complex_filters.h | |
5 * | |
6 * Written by Steve Underwood <steveu@coppice.org> | |
7 * | |
8 * Copyright (C) 2003 Steve Underwood | |
9 * | |
10 * All rights reserved. | |
11 * | |
12 * This program is free software; you can redistribute it and/or modify | |
13 * it under the terms of the GNU General Public License version 2, as | |
14 * published by the Free Software Foundation. | |
15 * | |
16 * This program is distributed in the hope that it will be useful, | |
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 * GNU General Public License for more details. | |
20 * | |
21 * You should have received a copy of the GNU General Public License | |
22 * along with this program; if not, write to the Free Software | |
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
24 * | |
25 * $Id: complex_filters.h,v 1.6 2006/10/24 13:45:28 steveu Exp $ | |
26 */ | |
27 | |
28 #if !defined(_COMPLEX_FILTERS_H_) | |
29 #define _COMPLEX_FILTERS_H_ | |
30 | |
31 typedef struct filter_s filter_t; | |
32 | |
33 typedef float (*filter_step_func_t)(filter_t *fi, float x); | |
34 | |
35 typedef struct | |
36 { | |
37 int nz; | |
38 int np; | |
39 filter_step_func_t fsf; | |
40 } fspec_t; | |
41 | |
42 struct filter_s | |
43 { | |
44 fspec_t *fs; | |
45 float sum; | |
46 int ptr; /* for moving average filters only */ | |
47 float v[]; | |
48 }; | |
49 | |
50 typedef struct | |
51 { | |
52 filter_t *ref; | |
53 filter_t *imf; | |
54 } cfilter_t; | |
55 | |
56 #ifdef __cplusplus | |
57 extern "C" { | |
58 #endif | |
59 | |
60 filter_t *filter_create(fspec_t *fs); | |
61 void filter_delete(filter_t *fi); | |
62 float filter_step(filter_t *fi, float x); | |
63 | |
64 cfilter_t *cfilter_create(fspec_t *fs); | |
65 void cfilter_delete(cfilter_t *cfi); | |
66 complexf_t cfilter_step(cfilter_t *cfi, const complexf_t *z); | |
67 | |
68 #ifdef __cplusplus | |
69 } | |
70 #endif | |
71 | |
72 #endif | |
73 /*- End of file ------------------------------------------------------------*/ |