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lpc.h

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00001 /* Copyright (C) 2002 Jean-Marc Valin 00002 File: lpc.h 00003 Functions for LPC (Linear Prediction Coefficients) analysis 00004 00005 Redistribution and use in source and binary forms, with or without 00006 modification, are permitted provided that the following conditions 00007 are met: 00008 00009 - Redistributions of source code must retain the above copyright 00010 notice, this list of conditions and the following disclaimer. 00011 00012 - Redistributions in binary form must reproduce the above copyright 00013 notice, this list of conditions and the following disclaimer in the 00014 documentation and/or other materials provided with the distribution. 00015 00016 - Neither the name of the Xiph.org Foundation nor the names of its 00017 contributors may be used to endorse or promote products derived from 00018 this software without specific prior written permission. 00019 00020 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 00021 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00022 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 00023 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR 00024 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00025 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 00026 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 00027 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 00028 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 00029 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00030 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00031 */ 00032 00033 #ifndef LPC_H 00034 #define LPC_H 00035 00036 void _spx_autocorr( 00037 const float * x, /* in: [0...n-1] samples x */ 00038 float *ac, /* out: [0...lag-1] ac values */ 00039 int lag, int n); 00040 00041 float /* returns minimum mean square error */ 00042 wld( 00043 float * lpc, /* [0...p-1] LPC coefficients */ 00044 const float * ac, /* in: [0...p] autocorrelation values */ 00045 float * ref, /* out: [0...p-1] reflection coef's */ 00046 int p 00047 ); 00048 00049 00050 #endif

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