vq.h

Melp Federal Vocoder 2.4 kbps low bit rate high qualitytexas instrument Melp encoder decoder c-code

/*

2.4 kbps MELP Proposed Federal Standard speech coder

version 1.2

Copyright (c) 1996, Texas Instruments, Inc.  

Texas Instruments has intellectual property rights on the MELP
algorithm.  The Texas Instruments contact for licensing issues for
commercial and non-government use is William Gordon, Director,
Government Contracts, Texas Instruments Incorporated, Semiconductor
Group (phone [phone]).


*/

/* 
   vq.h     VQ include file.
            (Search/decode/distortion/weighting functions for VQ)

   Copyright (c) 1995 by Texas Instruments Incorporated.  All rights reserved.
*/

#ifndef _vq_h_
#define _vq_h_

float vq_ms4(float *cb, float *u, float *u_est, int *levels, int ma, int stages, int p, float *w, float *u_hat, int *indices, int max_inner);
float *vq_msd2(float *cb, float *u, float *u_est, float *a, int *indices, 
       int *levels, int stages, int p, int conversion);
float *vq_lspw(float *w,float *lsp,float *a,int p);

/* Structure definition */
struct msvq_param {         /* Multistage VQ parameters */
    int num_stages;
    int *num_levels;
    int *num_bits;
    int dimension;
    int num_best;
    int *indices;
    char *fname_cb;
    float *cb;
};

/* External function definitions */

#define msvq_enc(u,w,u_hat,par)\
    vq_ms4(par.cb,u,(float*)NULL,par.num_levels,\
	  par.num_best,par.num_stages,par.dimension,w,u_hat,\
	  par.indices,MSVQ_MAXCNT)

#define fsvq_enc(u,u_hat,par)\
    vq_enc(par.cb,u,*(par.num_levels),\
	  par.dimension,u_hat,\
	  par.indices)

#define msvq_dec(u,par)\
    vq_msd2(par.cb,u,(float*)NULL,(float*)NULL,par.indices,par.num_levels,par.num_stages,par.dimension,0)

void msvq_init(struct msvq_param *par);

float vq_enc(float *cb, float *u, int levels, int p, float *u_hat, int *indices);

void vq_fsw(float *w_fs, int num_harm, float pitch);


#endif