convolve.h

实现3GPP的GSM中AMR语音的CODECS。

/* ------------------------------------------------------------------
 * Copyright (C) 2008 PacketVideo
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 * -------------------------------------------------------------------
 */
/****************************************************************************************
Portions of this file are derived from the following 3GPP standard:

    3GPP TS 26.073
    ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
    Available from http://www.3gpp.org

(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
Permission to distribute, modify and use this file under the standard license
terms listed above has been obtained from the copyright holder.
****************************************************************************************/
/*
********************************************************************************
*
*      GSM AMR-NB speech codec   R98   Version 7.5.0   March 2, 2001
*                                R99   Version 3.2.0
*                                REL-4 Version 4.0.0
*
********************************************************************************
*
*      File             : convolve.h
*      Purpose          : Perform the convolution between two vectors x[]
*                       : and h[] and write the result in the vector y[].
*                       : All vectors are of length L and only the first
*                       : L samples of the convolution are computed.
*
********************************************************************************
*/
#ifndef convolve_h
#define convolve_h "$Id $"

/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "typedef.h"

#ifdef __cplusplus
extern "C"
{
#endif

    /*
    ********************************************************************************
    *                         DEFINITION OF DATA TYPES
    ********************************************************************************
    */

    /*
    ********************************************************************************
    *                         DECLARATION OF PROTOTYPES
    ********************************************************************************
    */
    void Convolve(
        Word16 x[],        /* (i)  : input vector                               */
        Word16 h[],        /* (i)  : impulse response                           */
        Word16 y[],        /* (o)  : output vector                              */
        Word16 L           /* (i)  : vector size                                */
    );

#ifdef __cplusplus
}
#endif

#endif