OLD | NEW |
(Empty) | |
| 1 /* Copyright (C) 2002 Jean-Marc Valin */ |
| 2 /** |
| 3 @file lpc.h |
| 4 @brief Functions for LPC (Linear Prediction Coefficients) analysis |
| 5 */ |
| 6 /* |
| 7 Redistribution and use in source and binary forms, with or without |
| 8 modification, are permitted provided that the following conditions |
| 9 are met: |
| 10 |
| 11 - Redistributions of source code must retain the above copyright |
| 12 notice, this list of conditions and the following disclaimer. |
| 13 |
| 14 - Redistributions in binary form must reproduce the above copyright |
| 15 notice, this list of conditions and the following disclaimer in the |
| 16 documentation and/or other materials provided with the distribution. |
| 17 |
| 18 - Neither the name of the Xiph.org Foundation nor the names of its |
| 19 contributors may be used to endorse or promote products derived from |
| 20 this software without specific prior written permission. |
| 21 |
| 22 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 23 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 24 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 25 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR |
| 26 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 27 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 28 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 29 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 30 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 31 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 32 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 33 */ |
| 34 |
| 35 #ifndef LPC_H |
| 36 #define LPC_H |
| 37 |
| 38 #include "arch.h" |
| 39 |
| 40 void _spx_autocorr( |
| 41 const spx_word16_t * x, /* in: [0...n-1] samples x */ |
| 42 spx_word16_t *ac, /* out: [0...lag-1] ac values */ |
| 43 int lag, int n); |
| 44 |
| 45 spx_word32_t /* returns minimum mean square error */ |
| 46 _spx_lpc( |
| 47 spx_coef_t * lpc, /* [0...p-1] LPC coefficients */ |
| 48 const spx_word16_t * ac, /* in: [0...p] autocorrelation values */ |
| 49 int p |
| 50 ); |
| 51 |
| 52 |
| 53 #endif |
OLD | NEW |