/usr/include/spandsp/private/modem_echo.h is in libspandsp-dev 0.0.6-2.1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 | /*
* SpanDSP - a series of DSP components for telephony
*
* private/modem_echo.h - An echo cancellor, suitable for electrical echos in GSTN modems
*
* Written by Steve Underwood <steveu@coppice.org>
*
* Copyright (C) 2001, 2004 Steve Underwood
*
* Based on a bit from here, a bit from there, eye of toad,
* ear of bat, etc - plus, of course, my own 2 cents.
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1,
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*! \file */
#if !defined(_SPANDSP_PRIVATE_MODEM_ECHO_H_)
#define _SPANDSP_PRIVATE_MODEM_ECHO_H_
/*!
Modem line echo canceller descriptor. This defines the working state for a line
echo canceller.
*/
struct modem_echo_can_state_s
{
int adapt;
int taps;
fir16_state_t fir_state;
/*! Echo FIR taps (16 bit version) */
int16_t *fir_taps16;
/*! Echo FIR taps (32 bit version) */
int32_t *fir_taps32;
int tx_power;
int rx_power;
int curr_pos;
};
#endif
/*- End of file ------------------------------------------------------------*/
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