Mercurial > hg > audiostuff
comparison spandsp-0.0.6pre17/src/spandsp/private/echo.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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| 3:c6c5a16ce2f2 | 4:26cd8f1ef0b1 |
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| 1 /* | |
| 2 * SpanDSP - a series of DSP components for telephony | |
| 3 * | |
| 4 * private/echo.h - An echo cancellor, suitable for electrical and acoustic | |
| 5 * cancellation. This code does not currently comply with | |
| 6 * any relevant standards (e.g. G.164/5/7/8). | |
| 7 * | |
| 8 * Written by Steve Underwood <steveu@coppice.org> | |
| 9 * | |
| 10 * Copyright (C) 2001 Steve Underwood | |
| 11 * | |
| 12 * All rights reserved. | |
| 13 * | |
| 14 * This program is free software; you can redistribute it and/or modify | |
| 15 * it under the terms of the GNU Lesser General Public License version 2.1, | |
| 16 * as published by the Free Software Foundation. | |
| 17 * | |
| 18 * This program is distributed in the hope that it will be useful, | |
| 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 21 * GNU Lesser General Public License for more details. | |
| 22 * | |
| 23 * You should have received a copy of the GNU Lesser General Public | |
| 24 * License along with this program; if not, write to the Free Software | |
| 25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
| 26 * | |
| 27 * $Id: echo.h,v 1.1 2009/09/22 13:11:04 steveu Exp $ | |
| 28 */ | |
| 29 | |
| 30 /*! \file */ | |
| 31 | |
| 32 #if !defined(_SPANDSP_PRIVATE_ECHO_H_) | |
| 33 #define _SPANDSP_PRIVATE_ECHO_H_ | |
| 34 | |
| 35 /*! | |
| 36 G.168 echo canceller descriptor. This defines the working state for a line | |
| 37 echo canceller. | |
| 38 */ | |
| 39 struct echo_can_state_s | |
| 40 { | |
| 41 int tx_power[4]; | |
| 42 int rx_power[3]; | |
| 43 int clean_rx_power; | |
| 44 | |
| 45 int rx_power_threshold; | |
| 46 int nonupdate_dwell; | |
| 47 | |
| 48 int curr_pos; | |
| 49 | |
| 50 int taps; | |
| 51 int tap_mask; | |
| 52 int adaption_mode; | |
| 53 | |
| 54 int32_t supp_test1; | |
| 55 int32_t supp_test2; | |
| 56 int32_t supp1; | |
| 57 int32_t supp2; | |
| 58 int vad; | |
| 59 int cng; | |
| 60 | |
| 61 int16_t geigel_max; | |
| 62 int geigel_lag; | |
| 63 int dtd_onset; | |
| 64 int tap_set; | |
| 65 int tap_rotate_counter; | |
| 66 | |
| 67 int32_t latest_correction; /* Indication of the magnitude of the latest | |
| 68 adaption, or a code to indicate why adaption | |
| 69 was skipped, for test purposes */ | |
| 70 int32_t last_acf[28]; | |
| 71 int narrowband_count; | |
| 72 int narrowband_score; | |
| 73 | |
| 74 fir16_state_t fir_state; | |
| 75 /*! Echo FIR taps (16 bit version) */ | |
| 76 int16_t *fir_taps16[4]; | |
| 77 /*! Echo FIR taps (32 bit version) */ | |
| 78 int32_t *fir_taps32; | |
| 79 | |
| 80 /* DC and near DC blocking filter states */ | |
| 81 int32_t tx_hpf[2]; | |
| 82 int32_t rx_hpf[2]; | |
| 83 | |
| 84 /* Parameters for the optional Hoth noise generator */ | |
| 85 int cng_level; | |
| 86 int cng_rndnum; | |
| 87 int cng_filter; | |
| 88 | |
| 89 /* Snapshot sample of coeffs used for development */ | |
| 90 int16_t *snapshot; | |
| 91 }; | |
| 92 | |
| 93 #endif | |
| 94 /*- End of file ------------------------------------------------------------*/ |