vad.h

语音编码G.729 语音编码G.729

/*
   ITU-T G.729 Annex C+ - Reference C code for floating point
                         implementation of G.729 Annex C+
                         (integration of Annexes B, D and E)
                         Version 2.1 of October 1999
*/

/*
 File : VAD.H
*/

#define     NP            12                  /* Increased LPC order */
#define     NOISE         0
#define     VOICE         1
#define     INIT_FRAME    32
#define     INIT_COUNT    20
#define     ZC_START      120
#define     ZC_END        200

/* VAD static variables */
struct vad_state_t
{
	FLOAT MeanLSF[M];
	FLOAT Min_buffer[16];
	FLOAT Prev_Min, Next_Min, Min;
	FLOAT MeanE, MeanSE, MeanSLE, MeanSZC;
	FLOAT prev_energy;
	int count_sil, count_update, count_ext;
	int flag, v_flag, less_count;
};

void vad_init(struct vad_state_t *);

void vad(struct vad_state_t *, FLOAT  rc, FLOAT *lsf, FLOAT *rxx, FLOAT *sigpp, int frm_count,
    int prev_marker, int pprev_marker, int *marker, FLOAT *Energy_db);