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: pit_shrp.c *
19 * *
20 * Description: Performs Pitch sharpening routine *
21 * *
22 ************************************************************************/
23
24 #include "typedef.h"
25 #include "basic_op.h"
26
Pit_shrp(Word16 * x,Word16 pit_lag,Word16 sharp,Word16 L_subfr)27 void Pit_shrp(
28 Word16 * x, /* in/out: impulse response (or algebraic code) */
29 Word16 pit_lag, /* input : pitch lag */
30 Word16 sharp, /* input : pitch sharpening factor (Q15) */
31 Word16 L_subfr /* input : subframe size */
32 )
33 {
34 Word32 i;
35 Word32 L_tmp;
36 Word16 *x_ptr = x + pit_lag;
37
38 for (i = pit_lag; i < L_subfr; i++)
39 {
40 L_tmp = (*x_ptr << 15);
41 L_tmp += *x++ * sharp;
42 *x_ptr++ = ((L_tmp + 0x4000)>>15);
43 }
44
45 return;
46 }
47
48
49
50