www.pudn.com > ETSI_ES_202_212_software.rar > MelProcExports.h

/*===============================================================================
 *      ETSI ES 202 212   Distributed Speech Recognition
 *      Extended Advanced Front-End Feature Extraction Algorithm & Compression Algorithm
 *      Speech Reconstruction Algorithm.
 *      C-language software implementation                                      
 *      Version 1.1.1   October, 2003                                            
 *===============================================================================*/
/*-------------------------------------------------------------------------------
 *
 * FILE NAME: MelProcExports.h
 * PURPOSE: 1) Mel-filtering of FFT spectrum using the Mel filter bank 
 *             frequency windows.
 *          2) Mel inverse DCT applied on the output of Mel filter bank.
 *
 *-------------------------------------------------------------------------------*/
#ifndef _MELPROCEXPORTS_H
#define _MELPROCEXPORTS_H

#define WF_MEL_ORDER        25

// Structure for FFT window (one triangle in the chained list)
struct MelFB_Window
{
  int StartingPoint;
  int Length;
  float *Data;
  struct MelFB_Window *Next;
};                                        


MelFB_Window *CMelFBAlloc ();

void InitMelFBwindows (MelFB_Window * FirstWin, float StFreq, float SmplFreq, int FFTLength, int NumChannels, BOOLEAN normalize);
void InitFFTWindows (MelFB_Window *FirstWin,
					 float StFreq,
					 float SmplFreq,
					 int FFTLength,
					 int NumChannels);
void ComputeTriangle (MelFB_Window * FirstWin);

void DoMelFB (float *SigFFT, MelFB_Window * FirstWin);

void ReleaseMelFBwindows (MelFB_Window *FirstWin);

void DoMelIDCT (float *inData, float **melIDCTbasis, int melOrder, int timeLength);
void InitMelIDCTbasis (float **melIDCTbasis, MelFB_Window *FirstWin, short melorder, int sampFreq, int FFTLength);

#endif