g729ev_tdbwe_generate_excitation.h

最新的ITU-T的宽带语音编解码标准G.729.1,是对原先的G.729的最好的调整.码流输出速率可以进行自适应调整.满足未来通信要求.希望对大家有所帮助.

/* ITU-T G.729EV Optimization/Characterization Candidate                         */
/* Version:       1.0.a                                                          */
/* Revision Date: June 28, 2006                                                  */

/*
   ITU-T G.729EV Optimization/Characterization Candidate    ANSI-C Source Code
   Copyright (c) 2006 
   France Telecom, Matsushita Electric, Mindspeed, Siemens AG, ETRI, VoiceAge Corp.
   All rights reserved
*/

#ifndef __G729EV_TDBWE_GENERATE_EXCITATION_H__
#define __G729EV_TDBWE_GENERATE_EXCITATION_H__

#include "stl.h"
#include "G729EV_MAIN_defines.h"
#include "G729EV_MAIN_filt.h"



/* type definition for excitation information (for 10 ms frames)
   from the G.729A+ baseband codec */
typedef struct
{
  Word32    power_ltp[2];
  Word32    power_fix[2];
  Word16    lag[2];             /* Q.0 */
  Word16    frac_lag[2];        /* Q.0 */

} G729EV_TDBWE_g729_info;


/* type definition for the excitation generator's state */
typedef struct
{
  G729EV_MAIN_IIRN_STAT lowpass_3_kHz;

  Word16    signal_tonal_buffer[G729EV_TDBWE_LENGTH_PULSE_SHAPE];

  Word16    old_lag;
  Word16    old_gain_tonal;
  Word32    seed;

  Word16    prev_pulse;
  Word16    prev_pulse_frac;

} G729EV_TDBWE_generate_excitation_state;



/* prototypes for exported functions */

void      G729EV_TDBWE_generate_excitation_initialize(G729EV_TDBWE_generate_excitation_state * state);

void      G729EV_TDBWE_generate_excitation(G729EV_TDBWE_generate_excitation_state * state,
                                           G729EV_TDBWE_g729_info * parameters, Word16 * output);


/* tables */

extern const Word16 G729EV_TDBWE_pulse_shapes_frac6[G729EV_TDBWE_LENGTH_PULSE_SHAPE * G729EV_TDBWE_NUMBER_PULSE_SHAPES];



#endif