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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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