| /* |
| * 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( |
| WebRtc_Word16 *a, /* (o) lpc coefficients Q12 */ |
| WebRtc_Word16 *lsf1, /* (i) first set of lsf coefficients Q13 */ |
| WebRtc_Word16 *lsf2, /* (i) second set of lsf coefficients Q13 */ |
| WebRtc_Word16 coef, /* (i) weighting coefficient to use between |
| lsf1 and lsf2 Q14 */ |
| WebRtc_Word16 length /* (i) length of coefficient vectors */ |
| ){ |
| WebRtc_Word16 lsftmp[LPC_FILTERORDER]; |
| |
| /* interpolate LSF */ |
| WebRtcIlbcfix_Interpolate(lsftmp, lsf1, lsf2, coef, length); |
| |
| /* Compute the filter coefficients from the LSF */ |
| WebRtcIlbcfix_Lsf2Poly(a, lsftmp); |
| } |