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 : 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 54 extern "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