calc_cor.h revision b841f14f8e51f2365945281fbfa54ef6a1b1b5a6 
1/* ------------------------------------------------------------------
2 * Copyright (C) 1998-2009 PacketVideo
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
13 * express or implied.
14 * See the License for the specific language governing permissions
15 * and limitations under the License.
16 * -------------------------------------------------------------------
17 */
18/****************************************************************************************
19Portions of this file are derived from the following 3GPP standard:
20
21    3GPP TS 26.073
22    ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
23    Available from http://www.3gpp.org
24
25(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
26Permission to distribute, modify and use this file under the standard license
27terms listed above has been obtained from the copyright holder.
28****************************************************************************************/
29/*
30********************************************************************************
31*
32*      GSM AMR-NB speech codec   R98   Version 7.5.0   March 2, 2001
33*                                R99   Version 3.2.0
34*                                REL-4 Version 4.0.0
35*
36********************************************************************************
37*
38*      File             : calc_cor.h
39*      Purpose          : Calculate all correlations for prior the OL LTP
40*
41********************************************************************************
42*/
43#ifndef calc_cor_h
44#define calc_cor_h "$Id $"
45
46/*
47********************************************************************************
48*                         INCLUDE FILES
49********************************************************************************
50*/
51#include "typedef.h"
52
53#ifdef __cplusplus
54extern "C"
55{
56#endif
57
58    /*
59    ********************************************************************************
60    *                         DECLARATION OF PROTOTYPES
61    ********************************************************************************
62    */
63    /*************************************************************************
64     *
65     *  FUNCTION: comp_corr
66     *
67     *  PURPOSE: Calculate all correlations of scal_sig[] in a given delay
68     *           range.
69     *
70     *  DESCRIPTION:
71     *      The correlation is given by
72     *           cor[t] = <scal_sig[n], scal_sig[n-t]>,  t=lag_min,...,lag_max
73     *      The functions outputs all correlations in the given range
74     *
75     *************************************************************************/
76    void comp_corr(Word16 scal_sig[],   /* i   : scaled signal.                     */
77    Word16 L_frame,     /* i   : length of frame to compute pitch   */
78    Word16 lag_max,     /* i   : maximum lag                        */
79    Word16 lag_min,     /* i   : minimum lag                        */
80    Word32 corr[]       /* o   : correlation of selected lag        */
81                  );
82
83#ifdef __cplusplus
84}
85#endif
86
87#endif
88