libsent/src/wav2mfcc/wav2mfcc-buffer.c File Reference

Convert speech inputs into MFCC parameter vectors (per utterance). More...

#include <sent/stddefs.h>
#include <sent/mfcc.h>

Go to the source code of this file.

Functions
int	Wav2MFCC (SP16 *wave, float **mfcc, Value *para, int nSamples, MFCCWork *w)
	Convert wave data to MFCC.
void	NormaliseLogE (float **mfcc, int frame_num, Value *para)
	Normalise log energy.
void	Delta (float **c, int frame, Value *para)
	Calculate delta coefficients.
void	Accel (float **c, int frame, Value *para)
	Calculate acceleration coefficients.
void	CMN (float **mfcc, int frame_num, int dim)
	Cepstrum Mean Normalization (buffered) Cepstral mean will be computed within the given MFCC vectors.
void	MVN (float **mfcc, int frame_num, Value *para)
	Cepstrum Mean/Variance Normalization (buffered).

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Detailed Description

Convert speech inputs into MFCC parameter vectors (per utterance).

This file contains functions to convert the whole speech input to MFCC vector array. The frame-wise MFCC computation needed for real-time recognition is defined in wav2mfcc-pipe.c.

The supported format is MFCC[_0][_E][_D][_A][_Z].

Author:

Akinobu LEE

Date:

Thu Feb 17 17:43:35 2005

Revision

1.4

Definition in file wav2mfcc-buffer.c.

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Function Documentation

int Wav2MFCC	(	SP16 *	wave,
		float **	mfcc,
		Value *	para,
		int	nSamples,
		MFCCWork *	w
	)

Convert wave data to MFCC.

Also does spectral subtraction if ssbuf specified.

Parameters:

	wave	[in] waveform data
	mfcc	[out] buffer to store the resulting MFCC parameter vector [t][0..veclen-1], should be already allocated
	para	[in] configuration parameters
	nSamples	[in] length of waveform data
	w	[i/o] MFCC calculation work area

Returns:

the number of processed frames.

Definition at line 57 of file wav2mfcc-buffer.c.

Referenced by wav2mfcc().

void NormaliseLogE	(	float **	mfcc,
		int	frame_num,
		Value *	para
	)

Normalise log energy.

Parameters:

	mfcc	[i/o] array of MFCC vectors
	frame_num	[in] number of frames
	para	[in] configuration parameters

Definition at line 110 of file wav2mfcc-buffer.c.

void Delta	(	float **	c,
		int	frame,
		Value *	para
	)

Calculate delta coefficients.

Parameters:

	c	[i/o] MFCC vectors, in which the delta coeff. will be appended.
	frame	[in] number of frames
	para	[in] configuration parameters

Definition at line 142 of file wav2mfcc-buffer.c.

void Accel	(	float **	c,
		int	frame,
		Value *	para
	)

Calculate acceleration coefficients.

Parameters:

	c	[i/o] MFCC vectors, in which the delta coeff. will be appended.
	frame	[in] number of frames
	para	[in] configuration parameters

Definition at line 180 of file wav2mfcc-buffer.c.

void CMN	(	float **	mfcc,
		int	frame_num,
		int	dim
	)

Cepstrum Mean Normalization (buffered) Cepstral mean will be computed within the given MFCC vectors.

Parameters:

	mfcc	[i/o] array of MFCC vectors
	frame_num	[in] number of frames
	dim	[in] total dimension of MFCC vectors

Definition at line 219 of file wav2mfcc-buffer.c.

void MVN	(	float **	mfcc,
		int	frame_num,
		Value *	para
	)

Cepstrum Mean/Variance Normalization (buffered).

Parameters:

	mfcc	[i/o] array of MFCC vectors
	frame_num	[in] number of frames
	para	[in] configuration parameters

Definition at line 248 of file wav2mfcc-buffer.c.

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