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 /****************************************************************************************
19 Portions 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)
26 Permission to distribute, modify and use this file under the standard license
27 terms 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             : syn_filt.h
39 *      Purpose          : Perform synthesis filtering through 1/A(z).
40 *
41 *
42 ********************************************************************************
43 */
44 #ifndef syn_filt_h
45 #define syn_filt_h "$Id $"
46 
47 /*
48 ********************************************************************************
49 *                         INCLUDE FILES
50 ********************************************************************************
51 */
52 #include "typedef.h"
53 
54 #ifdef __cplusplus
55 extern "C"
56 {
57 #endif
58 
59     /*
60     ********************************************************************************
61     *                         DEFINITION OF DATA TYPES
62     ********************************************************************************
63     */
64 
65     /*
66     ********************************************************************************
67     *                         DECLARATION OF PROTOTYPES
68     ********************************************************************************
69     */
70     void Syn_filt(
71         Word16 a[],        /* (i)  : a[m+1] prediction coefficients   (m=10)    */
72         Word16 x[],        /* (i)  : input signal                               */
73         Word16 y[],        /* (o)  : output signal                              */
74         Word16 lg,         /* (i)  : size of filtering                          */
75         Word16 mem[],      /* (i/o): memory associated with this filtering.     */
76         Word16 update      /* (i)  : 0=no update, 1=update of memory.           */
77     );
78 
79 #ifdef __cplusplus
80 }
81 #endif
82 
83 #endif
84