updt_tar.c revision 956c553ab0ce72f8074ad0fda2ffd66a0305700c 
1/*
2 ** Copyright 2003-2010, VisualOn, Inc.
3 **
4 ** Licensed under the Apache License, Version 2.0 (the "License");
5 ** you may not use this file except in compliance with the License.
6 ** You may obtain a copy of the License at
7 **
8 **     http://www.apache.org/licenses/LICENSE-2.0
9 **
10 ** Unless required by applicable law or agreed to in writing, software
11 ** distributed under the License is distributed on an "AS IS" BASIS,
12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 ** See the License for the specific language governing permissions and
14 ** limitations under the License.
15 */
16
17/***********************************************************************
18*       File: updt_tar.c                                               *
19*                                                                      *
20*       Description: Update the target vector for codebook search      *
21*                                                                      *
22************************************************************************/
23
24#include "typedef.h"
25#include "basic_op.h"
26
27void Updt_tar(
28		Word16 * x,                           /* (i) Q0  : old target (for pitch search)     */
29		Word16 * x2,                          /* (o) Q0  : new target (for codebook search)  */
30		Word16 * y,                           /* (i) Q0  : filtered adaptive codebook vector */
31		Word16 gain,                          /* (i) Q14 : adaptive codebook gain            */
32		Word16 L                              /* (i)     : subframe size                     */
33	     )
34{
35	Word32 i;
36	Word32 L_tmp;
37
38	for (i = 0; i < L; i++)
39	{
40		L_tmp = x[i] << 15;
41		L_tmp -= (y[i] * gain)<<1;
42		x2[i] = extract_h(L_shl2(L_tmp, 1));
43	}
44
45	return;
46}
47
48
49
50