pit.h

melp谱的计算。本程序是语音编码melp的C程序实现

/*

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]).

*/

/*

  pit.h: include file for pitch subroutines
  
*/

/* External function definitions */
float double_chk(float sig_in[], float *pcorr, float pitch, float pdouble, int pmin, int pmax, int lmin);
void double_ver(float sig_in[], float *pcorr, float pitch, int pmin, int pmax, int lmin);
float find_pitch(float sig_in[],float *pcorr,int lower,int upper,int length);
float frac_pch(float sig_in[], float *corr, float pitch, int range, int pmin, int pmax, int lmin);
float pitch_ana(float speech[], float resid[], float pitch_est, float pitch_avg, float *pcorr2);
void pitch_ana_init(int pmin, int pmax, int fr, int lpf_ord, int lmin);
float p_avg_update(float pitch, float pcorr, float pthresh);
void p_avg_init(float pdecay, float default_pitch, int num_good);