private/modem_echo.h
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/*
* 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 ------------------------------------------------------------*/
fir16_state_t
Definition fir.h:46
modem_echo_can_state_s
Definition private/modem_echo.h:39
modem_echo_can_state_s::fir_taps16
int16_t * fir_taps16
Definition private/modem_echo.h:45
modem_echo_can_state_s::fir_taps32
int32_t * fir_taps32
Definition private/modem_echo.h:47