Mercurial > hg > audiostuff
annotate spandsp-0.0.6pre17/src/spandsp/complex_filters.h @ 4:26cd8f1ef0b1
import spandsp-0.0.6pre17
author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
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date | Fri, 25 Jun 2010 15:50:58 +0200 |
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rev | line source |
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1 /* |
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2 * SpanDSP - a series of DSP components for telephony |
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3 * |
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4 * complex_filters.h |
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5 * |
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6 * Written by Steve Underwood <steveu@coppice.org> |
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7 * |
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8 * Copyright (C) 2003 Steve Underwood |
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9 * |
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10 * All rights reserved. |
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11 * |
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12 * This program is free software; you can redistribute it and/or modify |
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13 * it under the terms of the GNU Lesser General Public License version 2.1, |
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14 * as published by the Free Software Foundation. |
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15 * |
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16 * This program is distributed in the hope that it will be useful, |
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17 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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19 * GNU Lesser General Public License for more details. |
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20 * |
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21 * You should have received a copy of the GNU Lesser General Public |
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22 * License along with this program; if not, write to the Free Software |
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23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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24 * |
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25 * $Id: complex_filters.h,v 1.14 2009/02/03 16:28:41 steveu Exp $ |
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26 */ |
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27 |
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28 #if !defined(_SPANDSP_COMPLEX_FILTERS_H_) |
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29 #define _SPANDSP_COMPLEX_FILTERS_H_ |
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30 |
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31 typedef struct filter_s filter_t; |
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32 |
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33 typedef float (*filter_step_func_t)(filter_t *fi, float x); |
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34 |
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35 /*! Filter state */ |
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36 typedef struct |
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37 { |
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38 int nz; |
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39 int np; |
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40 filter_step_func_t fsf; |
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41 } fspec_t; |
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42 |
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43 struct filter_s |
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44 { |
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45 fspec_t *fs; |
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46 float sum; |
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47 int ptr; /* Only for moving average filters */ |
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48 float v[]; |
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49 }; |
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50 |
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51 typedef struct |
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52 { |
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53 filter_t *ref; |
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54 filter_t *imf; |
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55 } cfilter_t; |
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56 |
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57 #if defined(__cplusplus) |
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58 extern "C" |
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59 { |
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60 #endif |
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61 |
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62 SPAN_DECLARE(filter_t *) filter_create(fspec_t *fs); |
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63 SPAN_DECLARE(void) filter_delete(filter_t *fi); |
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64 SPAN_DECLARE(float) filter_step(filter_t *fi, float x); |
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65 |
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66 SPAN_DECLARE(cfilter_t *) cfilter_create(fspec_t *fs); |
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67 SPAN_DECLARE(void) cfilter_delete(cfilter_t *cfi); |
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68 SPAN_DECLARE(complexf_t) cfilter_step(cfilter_t *cfi, const complexf_t *z); |
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69 |
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70 #if defined(__cplusplus) |
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71 } |
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72 #endif |
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73 |
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74 #endif |
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75 /*- End of file ------------------------------------------------------------*/ |