1 /*---------------------------------------------------------------------------*\ 2 Original Copyright 3 FILE........: AK2LSPD.H 4 TYPE........: Turbo C header file 5 COMPANY.....: Voicetronix 6 AUTHOR......: James Whitehall 7 DATE CREATED: 21/11/95 8 9 Modified by Jean-Marc Valin 10 11 This file contains functions for converting Linear Prediction 12 Coefficients (LPC) to Line Spectral Pair (LSP) and back. Note that the 13 LSP coefficients are not in radians format but in the x domain of the 14 unit circle. 15 16 \*---------------------------------------------------------------------------*/ 17 /** 18 @file lsp.h 19 @brief Line Spectral Pair (LSP) functions. 20 */ 21 /* Speex License: 22 23 Redistribution and use in source and binary forms, with or without 24 modification, are permitted provided that the following conditions 25 are met: 26 27 - Redistributions of source code must retain the above copyright 28 notice, this list of conditions and the following disclaimer. 29 30 - Redistributions in binary form must reproduce the above copyright 31 notice, this list of conditions and the following disclaimer in the 32 documentation and/or other materials provided with the distribution. 33 34 - Neither the name of the Xiph.org Foundation nor the names of its 35 contributors may be used to endorse or promote products derived from 36 this software without specific prior written permission. 37 38 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 39 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 40 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 41 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR 42 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 43 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 44 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 45 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 46 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 47 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 48 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 49 */ 50 51 #ifndef __AK2LSPD__ 52 #define __AK2LSPD__ 53 54 #include "arch.h" 55 56 int lpc_to_lsp (spx_coef_t *a, int lpcrdr, spx_lsp_t *freq, int nb, spx_word16_t delta, char *stack); 57 void lsp_to_lpc(spx_lsp_t *freq, spx_coef_t *ak, int lpcrdr, char *stack); 58 59 /*Added by JMV*/ 60 void lsp_enforce_margin(spx_lsp_t *lsp, int len, spx_word16_t margin); 61 62 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); 63 64 #endif /* __AK2LSPD__ */ 65