/*---------------------------------------------------------------------------*\ | |
Original Copyright | |
FILE........: AK2LSPD.H | |
TYPE........: Turbo C header file | |
COMPANY.....: Voicetronix | |
AUTHOR......: James Whitehall | |
DATE CREATED: 21/11/95 | |
Modified by Jean-Marc Valin | |
This file contains functions for converting Linear Prediction | |
Coefficients (LPC) to Line Spectral Pair (LSP) and back. Note that the | |
LSP coefficients are not in radians format but in the x domain of the | |
unit circle. | |
\*---------------------------------------------------------------------------*/ | |
/** | |
@file lsp.h | |
@brief Line Spectral Pair (LSP) functions. | |
*/ | |
/* Speex License: | |
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 __AK2LSPD__ | |
#define __AK2LSPD__ | |
#include "arch.h" | |
int lpc_to_lsp (spx_coef_t *a, int lpcrdr, spx_lsp_t *freq, int nb, spx_word16_t delta, char *stack); | |
void lsp_to_lpc(spx_lsp_t *freq, spx_coef_t *ak, int lpcrdr, char *stack); | |
/*Added by JMV*/ | |
void lsp_enforce_margin(spx_lsp_t *lsp, int len, spx_word16_t margin); | |
void lsp_interpolate(spx_lsp_t *old_lsp, spx_lsp_t *new_lsp, spx_lsp_t *interp_lsp, int len, int subframe, int nb_subframes); | |
#endif /* __AK2LSPD__ */ |