blob: 66bbde8e7f3e001d9c822b41e10d1aa11ccfaab6 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
/******************************************************************
iLBC Speech Coder ANSI-C Source Code
WebRtcIlbcfix_LspInterpolate2PolyDec.c
******************************************************************/
#include "interpolate.h"
#include "lsf_to_poly.h"
#include "defines.h"
/*----------------------------------------------------------------*
* interpolation of lsf coefficients for the decoder
*---------------------------------------------------------------*/
void WebRtcIlbcfix_LspInterpolate2PolyDec(
int16_t *a, /* (o) lpc coefficients Q12 */
int16_t *lsf1, /* (i) first set of lsf coefficients Q13 */
int16_t *lsf2, /* (i) second set of lsf coefficients Q13 */
int16_t coef, /* (i) weighting coefficient to use between
lsf1 and lsf2 Q14 */
int16_t length /* (i) length of coefficient vectors */
){
int16_t lsftmp[LPC_FILTERORDER];
/* interpolate LSF */
WebRtcIlbcfix_Interpolate(lsftmp, lsf1, lsf2, coef, length);
/* Compute the filter coefficients from the LSF */
WebRtcIlbcfix_Lsf2Poly(a, lsftmp);
}
|
