g729ev_tdbwe_frequency_envelope_shaping.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_FREQUENCY_ENVELOPE_SHAPING_H__
#define __G729EV_TDBWE_FREQUENCY_ENVELOPE_SHAPING_H__

#include "stl.h"
#include "G729EV_MAIN_defines.h"
#include "G729EV_TDBWE_extract_frequency_envelope.h"
#include "G729EV_TDBWE_fir.h"


/* type definition for the state of the frequency envelope shaping
   module */
typedef struct
{
  Word16    filter_coeffs[G729EV_TDBWE_FREQ_ENV_SHAPING_FILTER_LENGTH];
  G729EV_TDBWE_fir_state fir;
} G729EV_TDBWE_frequency_envelope_shaping_state;


/* prototypes for exported functions */

void      G729EV_TDBWE_frequency_envelope_shaping_initialize(G729EV_TDBWE_frequency_envelope_shaping_state * state);

void      G729EV_TDBWE_frequency_envelope_shaping(G729EV_TDBWE_frequency_envelope_shaping_state * state,
                                                  Word16 * input, Word16 * output, Word16 * desired_envelope);


/* tables */

extern const Word16 G729EV_TDBWE_fes_coeffs_matrix[221];


#endif