43 lines
1.6 KiB
C
43 lines
1.6 KiB
C
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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/******************************************************************
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iLBC Speech Coder ANSI-C Source Code
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WebRtcIlbcfix_LspInterpolate2PolyDec.c
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******************************************************************/
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#include "interpolate.h"
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#include "lsf_to_poly.h"
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#include "defines.h"
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/*----------------------------------------------------------------*
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* interpolation of lsf coefficients for the decoder
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*---------------------------------------------------------------*/
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void WebRtcIlbcfix_LspInterpolate2PolyDec(
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WebRtc_Word16 *a, /* (o) lpc coefficients Q12 */
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WebRtc_Word16 *lsf1, /* (i) first set of lsf coefficients Q13 */
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WebRtc_Word16 *lsf2, /* (i) second set of lsf coefficients Q13 */
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WebRtc_Word16 coef, /* (i) weighting coefficient to use between
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lsf1 and lsf2 Q14 */
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WebRtc_Word16 length /* (i) length of coefficient vectors */
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){
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WebRtc_Word16 lsftmp[LPC_FILTERORDER];
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/* interpolate LSF */
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WebRtcIlbcfix_Interpolate(lsftmp, lsf1, lsf2, coef, length);
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/* Compute the filter coefficients from the LSF */
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WebRtcIlbcfix_Lsf2Poly(a, lsftmp);
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}
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