/*
**
** File:        "lpc.h"
**
** Description:     Function prototypes for "lpc.c"
**  
*/

/*
    ITU-T G.723 Speech Coder   ANSI-C Source Code     Version 5.00
    copyright (c) 1995, AudioCodes, DSP Group, France Telecom,
    Universite de Sherbrooke.  All rights reserved.
*/


void    Comp_Lpc( Word16 *UnqLpc, Word16 *PrevDat, Word16 *DataBuff );//計算LPC的系數
Word16  Durbin( Word16 *Lpc, Word16 *Corr, Word16 Err, Word16 *Pk2 ); //德賓算法
void    Wght_Lpc( Word16 *PerLpc, Word16 *UnqLpc );  //感覺加權濾波系數
void    Error_Wght( Word16 *Dpnt, Word16 *PerLpc );
void    Comp_Ir( Word16 *ImpResp, Word16 *QntLpc, Word16 *PerLpc, PWDEF Pw ); //沖擊響應計算
void    Sub_Ring( Word16 *Dpnt, Word16 *QntLpc, Word16 *PerLpc, Word16 *PrevErr, PWDEF Pw );
void    Upd_Ring( Word16 *Dpnt, Word16 *QntLpc, Word16 *PerLpc, Word16 *PrevErr );  //狀態更新