57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
/*
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* SpanDSP - a series of DSP components for telephony
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*
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* private/modem_echo.h - An echo cancellor, suitable for electrical echos in GSTN modems
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*
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* Written by Steve Underwood <steveu@coppice.org>
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*
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* Copyright (C) 2001, 2004 Steve Underwood
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*
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* Based on a bit from here, a bit from there, eye of toad,
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* ear of bat, etc - plus, of course, my own 2 cents.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 2.1,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*! \file */
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#if !defined(_SPANDSP_PRIVATE_MODEM_ECHO_H_)
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#define _SPANDSP_PRIVATE_MODEM_ECHO_H_
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/*!
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Modem line echo canceller descriptor. This defines the working state for a line
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echo canceller.
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*/
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struct modem_echo_can_state_s
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{
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int adapt;
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int taps;
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fir16_state_t fir_state;
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/*! Echo FIR taps (16 bit version) */
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int16_t *fir_taps16;
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/*! Echo FIR taps (32 bit version) */
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int32_t *fir_taps32;
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int tx_power;
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int rx_power;
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int curr_pos;
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};
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#endif
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/*- End of file ------------------------------------------------------------*/
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