mirror of
https://github.com/ioquake/ioq3.git
synced 2024-11-10 15:21:35 +00:00
54 lines
2.1 KiB
C
54 lines
2.1 KiB
C
|
/* Copyright (C) 2002 Jean-Marc Valin */
|
||
|
|
/**
|
||
|
|
@file lpc.h
|
||
|
|
@brief Functions for LPC (Linear Prediction Coefficients) analysis
|
||
|
|
*/
|
||
|
|
/*
|
||
|
|
Redistribution and use in source and binary forms, with or without
|
||
|
|
modification, are permitted provided that the following conditions
|
||
|
|
are met:
|
||
|
|
|
||
|
|
- Redistributions of source code must retain the above copyright
|
||
|
|
notice, this list of conditions and the following disclaimer.
|
||
|
|
|
||
|
|
- Redistributions in binary form must reproduce the above copyright
|
||
|
|
notice, this list of conditions and the following disclaimer in the
|
||
|
|
documentation and/or other materials provided with the distribution.
|
||
|
|
|
||
|
|
- Neither the name of the Xiph.org Foundation nor the names of its
|
||
|
|
contributors may be used to endorse or promote products derived from
|
||
|
|
this software without specific prior written permission.
|
||
|
|
|
||
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||
|
|
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
|
||
|
|
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
||
|
|
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
||
|
|
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
||
|
|
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
||
|
|
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
||
|
|
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
||
|
|
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef LPC_H
|
||
|
|
#define LPC_H
|
||
|
|
|
||
|
|
#include "arch.h"
|
||
|
|
|
||
|
|
void _spx_autocorr(
|
||
|
|
const spx_word16_t * x, /* in: [0...n-1] samples x */
|
||
|
|
spx_word16_t *ac, /* out: [0...lag-1] ac values */
|
||
|
|
int lag, int n);
|
||
|
|
|
||
|
|
spx_word32_t /* returns minimum mean square error */
|
||
|
|
_spx_lpc(
|
||
|
|
spx_coef_t * lpc, /* [0...p-1] LPC coefficients */
|
||
|
|
const spx_word16_t * ac, /* in: [0...p] autocorrelation values */
|
||
|
|
int p
|
||
|
|
);
|
||
|
|
|
||
|
|
|
||
|
|
#endif
|