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lsp.h

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00001 /*---------------------------------------------------------------------------*\ 00002 Original Copyright 00003 FILE........: AK2LSPD.H 00004 TYPE........: Turbo C header file 00005 COMPANY.....: Voicetronix 00006 AUTHOR......: James Whitehall 00007 DATE CREATED: 21/11/95 00008 00009 Modified by Jean-Marc Valin 00010 00011 This file contains functions for converting Linear Prediction 00012 Coefficients (LPC) to Line Spectral Pair (LSP) and back. Note that the 00013 LSP coefficients are not in radians format but in the x domain of the 00014 unit circle. 00015 00016 \*---------------------------------------------------------------------------*/ 00017 /* Speex License: 00018 00019 Redistribution and use in source and binary forms, with or without 00020 modification, are permitted provided that the following conditions 00021 are met: 00022 00023 - Redistributions of source code must retain the above copyright 00024 notice, this list of conditions and the following disclaimer. 00025 00026 - Redistributions in binary form must reproduce the above copyright 00027 notice, this list of conditions and the following disclaimer in the 00028 documentation and/or other materials provided with the distribution. 00029 00030 - Neither the name of the Xiph.org Foundation nor the names of its 00031 contributors may be used to endorse or promote products derived from 00032 this software without specific prior written permission. 00033 00034 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 00035 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00036 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 00037 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR 00038 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00039 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 00040 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 00041 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 00042 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 00043 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00044 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00045 */ 00046 00047 #ifndef __AK2LSPD__ 00048 #define __AK2LSPD__ 00049 00050 int lpc_to_lsp (float *a, int lpcrdr, float *freq, int nb, float delta, char *stack); 00051 void lsp_to_lpc(float *freq, float *ak, int lpcrdr, char *stack); 00052 00053 /*Added by JMV*/ 00054 void lsp_enforce_margin(float *lsp, int len, float margin); 00055 00056 00057 #endif /* __AK2LSPD__ */

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