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