c3_14pf.h

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.10平台上编译为嵌入式图形界面操作系统。

/**********************************************************************
** Copyright (C) 2000-2005 Trolltech AS and its licensors.
** All rights reserved.
**
** This file is part of the Qtopia Environment.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
** See below for additional copyright and license information
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/*
********************************************************************************
*
*      GSM AMR-NB speech codec   R98   Version 7.6.0   December 12, 2001
*                                R99   Version 3.3.0                
*                                REL-4 Version 4.1.0                
*
********************************************************************************
*
*      File             : c3_14pf.h
*      Purpose          : Searches a 14 bit algebraic codebook containing 3 pulses
*                         in a frame of 40 samples.
*
********************************************************************************
*/
#ifndef c3_14pf_h
#define c3_14pf_h "$Id $"
 
/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "typedef.h"

/*
********************************************************************************
*                         LOCAL VARIABLES AND TABLES
********************************************************************************
*/

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

/*
********************************************************************************
*                         DECLARATION OF PROTOTYPES
********************************************************************************
*/
/*************************************************************************
 *
 *  FUNCTION:  code_3i40_14bits()
 *
 *  PURPOSE:  Searches a 14 bit algebraic codebook containing 3 pulses
 *            in a frame of 40 samples.
 *
 *  DESCRIPTION:
 *    The code length is 40, containing 3 nonzero pulses: i0...i2.
 *    All pulses can have two possible amplitudes: +1 or -1.
 *    Pulse i0 can have 8 possible positions, pulses i1 and i2 can have
 *    2x8=16 positions.
 *
 *       i0 :  0, 5, 10, 15, 20, 25, 30, 35.
 *       i1 :  1, 6, 11, 16, 21, 26, 31, 36.
 *             3, 8, 13, 18, 23, 28, 33, 38.
 *       i2 :  2, 7, 12, 17, 22, 27, 32, 37.
 *             4, 9, 14, 19, 24, 29, 34, 39.
 * 
 *************************************************************************/

Word16 code_3i40_14bits(
    Word16 x[], /* (i)   : target vector                                 */
    Word16 h[], /* (i)   : impulse response of weighted synthesis filter */
                /*         h[-L_subfr..-1] must be set to zero.          */
    Word16 T0,  /* (i)   : Pitch lag                                     */
    Word16 pitch_sharp, /* (i)   : Last quantized pitch gain             */
    Word16 code[],      /* (o)   : Innovative codebook                   */
    Word16 y[],         /* (o)   : filtered fixed codebook excitation    */
    Word16 * sign       /* (o)   : Signs of 3 pulses                     */
);

#endif