43 lines
1.5 KiB
C
43 lines
1.5 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_BwExpand.c
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******************************************************************/
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#include "defines.h"
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/*----------------------------------------------------------------*
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* lpc bandwidth expansion
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*---------------------------------------------------------------*/
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/* The output is in the same domain as the input */
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void WebRtcIlbcfix_BwExpand(
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WebRtc_Word16 *out, /* (o) the bandwidth expanded lpc coefficients */
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WebRtc_Word16 *in, /* (i) the lpc coefficients before bandwidth
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expansion */
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WebRtc_Word16 *coef, /* (i) the bandwidth expansion factor Q15 */
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WebRtc_Word16 length /* (i) the length of lpc coefficient vectors */
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) {
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int i;
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out[0] = in[0];
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for (i = 1; i < length; i++) {
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/* out[i] = coef[i] * in[i] with rounding.
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in[] and out[] are in Q12 and coef[] is in Q15
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*/
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out[i] = (WebRtc_Word16)((WEBRTC_SPL_MUL_16_16(coef[i], in[i])+16384)>>15);
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}
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}
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