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

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

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

Go to the source code of this file.

Functions

DeltaBuf * WMP_deltabuf_new (int veclen, int windowlen)

Allocate a new delta cycle buffer.

void WMP_deltabuf_free (DeltaBuf *db)

Destroy the delta cycle buffer.

void WMP_deltabuf_prepare (DeltaBuf *db)

Reset and clear the delta cycle buffer.

static void WMP_deltabuf_calc (DeltaBuf *db, int cur)

Calculate delta coefficients of the specified point in the cycle buffer.

boolean WMP_deltabuf_proceed (DeltaBuf *db, float *new_mfcc)

Store the given MFCC vector into the delta cycle buffer, and compute the latest delta coefficients.

boolean WMP_deltabuf_flush (DeltaBuf *db)

Flush the delta cycle buffer the delta coefficients left in the cycle buffer.

CMNWork * CMN_realtime_new (Value *para, float weight)

Initialize MAP-CMN at startup.

void CMN_realtime_free (CMNWork *c)

Free work area for real-time CMN.

void CMN_realtime_prepare (CMNWork *c)

Prepare for MAP-CMN at start of each input.

void CMN_realtime (CMNWork *c, float *mfcc)

Perform MAP-CMN for incoming MFCC vectors.

void CMN_realtime_update (CMNWork *c, HTK_Param *param)

Update initial cepstral mean from previous utterances for next input.

static boolean myread (void *buf, size_t unitbyte, int unitnum, FILE *fp)

Read binary with byte swap (assume file is Big Endian).

static boolean mywrite (void *buf, size_t unitbyte, size_t unitnum, int fd)

Write binary with byte swap (assume data is Big Endian).

boolean CMN_load_from_file (CMNWork *c, char *filename)

Load CMN parameter from file.

boolean CMN_save_to_file (CMNWork *c, char *filename)

Save the current CMN vector to a file.

void energy_max_init (ENERGYWork *energy)

Initialize work area for energy normalization on live input.

void energy_max_prepare (ENERGYWork *energy, Value *para)

Prepare values for energy normalization on live input.

LOGPROB energy_max_normalize (ENERGYWork *energy, LOGPROB f, Value *para)

Peform energy normalization using maximum of last input.

Detailed Description

Convert speech inputs into MFCC parameter vectors (per input frame).

There are functions are derived from wav2mfcc.c, to compute MFCC vectors in per-frame basis. When performing on-line recognition, these functions will be used instead of ones in wav2mfcc.c

Author:: Akinobu LEE

Date:: Thu Feb 17 18:12:30 2005

Revision: 1.3

Definition in file wav2mfcc-pipe.c.

Function Documentation

DeltaBuf* WMP_deltabuf_new	(	int	veclen,
		int	windowlen
	)

Allocate a new delta cycle buffer.

Parameters:

	veclen	[in] length of a vector
	windowlen	[in] window width for computing delta

Returns:: pointer to newly allocated delta cycle buffer structure.

Definition at line 60 of file wav2mfcc-pipe.c.

Referenced by RealTimeInit().

void WMP_deltabuf_free ( DeltaBuf * db )

Destroy the delta cycle buffer.

Parameters:

[i/o] delta cycle buffer

Definition at line 87 of file wav2mfcc-pipe.c.

Referenced by j_mfcccalc_free().

void WMP_deltabuf_prepare ( DeltaBuf * db )

Reset and clear the delta cycle buffer.

Parameters:

[i/o] delta cycle buffer

Definition at line 105 of file wav2mfcc-pipe.c.

Referenced by reset_mfcc().

static void WMP_deltabuf_calc	(	DeltaBuf *	db,
		int	cur
	)			`[static]`

Calculate delta coefficients of the specified point in the cycle buffer.

Parameters:

	db	[i/o] delta cycle buffer
	cur	[in] target point to calculate the delta coefficients

Definition at line 121 of file wav2mfcc-pipe.c.

Referenced by WMP_deltabuf_flush(), and WMP_deltabuf_proceed().

boolean WMP_deltabuf_proceed	(	DeltaBuf *	db,
		float *	new_mfcc
	)

Store the given MFCC vector into the delta cycle buffer, and compute the latest delta coefficients.

Parameters:

	db	[i/o] delta cycle buffer
	new_mfcc	[in] MFCC vector

Returns:: TRUE if next delta coeff. computed, in that case it is saved in db->delta[], or FALSE if delta is not yet computed by short of data.

Definition at line 164 of file wav2mfcc-pipe.c.

Referenced by RealTimeMFCC(), and RealTimeParam().

boolean WMP_deltabuf_flush ( DeltaBuf * db )

Flush the delta cycle buffer the delta coefficients left in the cycle buffer.

Parameters:

[i/o] delta cycle buffer

Returns:: TRUE if next delta coeff. computed, in that case it is saved in db->delta[], or FALSE if all delta computation has been flushed and no data is available.

Definition at line 206 of file wav2mfcc-pipe.c.

Referenced by RealTimeParam().

CMNWork* CMN_realtime_new	(	Value *	para,
		float	weight
	)

Initialize MAP-CMN at startup.

Parameters:

	para	[in] MFCC computation configuration parameter
	weight	[in] initial cepstral mean weight

Definition at line 247 of file wav2mfcc-pipe.c.

Referenced by RealTimeInit().

void CMN_realtime_free ( CMNWork * c )

Free work area for real-time CMN.

Parameters:

[i/o] CMN calculation work area

Definition at line 285 of file wav2mfcc-pipe.c.

Referenced by j_mfcccalc_free().

void CMN_realtime_prepare ( CMNWork * c )

Prepare for MAP-CMN at start of each input.

Parameters:

[i/o] CMN calculation work area

Definition at line 309 of file wav2mfcc-pipe.c.

Referenced by init_param(), and RealTimeResume().

void CMN_realtime	(	CMNWork *	c,
		float *	mfcc
	)

Perform MAP-CMN for incoming MFCC vectors.

Parameters:

	c	[i/o] CMN calculation work area
	mfcc	[in] MFCC vector

Definition at line 328 of file wav2mfcc-pipe.c.

Referenced by RealTimeMFCC(), and RealTimeParam().

void CMN_realtime_update	(	CMNWork *	c,
		HTK_Param *	param
	)

Update initial cepstral mean from previous utterances for next input.

Parameters:

[i/o] CMN calculation work area

Definition at line 389 of file wav2mfcc-pipe.c.

Referenced by RealTimeCMNUpdate().

static boolean myread	(	void *	buf,
		size_t	unitbyte,
		int	unitnum,
		FILE *	fp
	)			`[static]`

Read binary with byte swap (assume file is Big Endian).

Parameters:

	buf	[out] data buffer
	unitbyte	[in] size of unit in bytes
	unitnum	[in] number of units to be read
	fp	[in] file pointer

Returns:: TRUE if required number of units are fully read, FALSE if failed.

Definition at line 476 of file wav2mfcc-pipe.c.

static boolean mywrite	(	void *	buf,
		size_t	unitbyte,
		size_t	unitnum,
		int	fd
	)			`[static]`

Write binary with byte swap (assume data is Big Endian).

Parameters:

	buf	[in] data buffer
	unitbyte	[in] size of unit in bytes
	unitnum	[in] number of units to write
	fd	[in] file descriptor

Returns:: TRUE if required number of units are fully written, FALSE if failed.

Definition at line 498 of file wav2mfcc-pipe.c.

boolean CMN_load_from_file	(	CMNWork *	c,
		char *	filename
	)

Load CMN parameter from file.

If the number of MFCC dimension in the file does not match the specified one, an error will occur.

Parameters:

	c	[i/o] CMN calculation work area
	filename	[in] file name

Returns:: TRUE on success, FALSE on failure.

Definition at line 522 of file wav2mfcc-pipe.c.

Referenced by RealTimeInit().

boolean CMN_save_to_file	(	CMNWork *	c,
		char *	filename
	)

Save the current CMN vector to a file.

Parameters:

	c	[i/o] CMN calculation work area
	filename	[in] filename to save the data.

Returns:: TRUE on success, FALSE on failure.

Definition at line 579 of file wav2mfcc-pipe.c.

Referenced by RealTimeCMNUpdate().

void energy_max_init ( ENERGYWork * energy )

Initialize work area for energy normalization on live input.

This should be called once on startup.

Parameters:

energy

[in] energy normalization work area

Definition at line 629 of file wav2mfcc-pipe.c.

Referenced by RealTimeInit().

void energy_max_prepare	(	ENERGYWork *	energy,
		Value *	para
	)

Prepare values for energy normalization on live input.

This should be called before each input segment.

Parameters:

	energy	[in] energy normalization work area
	para	[in] MFCC computation configuration parameter

Definition at line 642 of file wav2mfcc-pipe.c.

Referenced by reset_mfcc().

LOGPROB energy_max_normalize	(	ENERGYWork *	energy,
		LOGPROB	f,
		Value *	para
	)

Peform energy normalization using maximum of last input.

Parameters:

	energy	[in] energy normalization work area
	f	[in] raw energy
	para	[in] MFCC computation configuration parameter

Returns:: value of the normalized log energy.

Definition at line 659 of file wav2mfcc-pipe.c.

Referenced by RealTimeMFCC().

Generated on Thu Jul 23 12:14:20 2009 for Julius by

1.5.1


Functions
DeltaBuf *	WMP_deltabuf_new (int veclen, int windowlen)
	Allocate a new delta cycle buffer.
void	WMP_deltabuf_free (DeltaBuf *db)
	Destroy the delta cycle buffer.
void	WMP_deltabuf_prepare (DeltaBuf *db)
	Reset and clear the delta cycle buffer.
static void	WMP_deltabuf_calc (DeltaBuf *db, int cur)
	Calculate delta coefficients of the specified point in the cycle buffer.
boolean	WMP_deltabuf_proceed (DeltaBuf db, float new_mfcc)
	Store the given MFCC vector into the delta cycle buffer, and compute the latest delta coefficients.
boolean	WMP_deltabuf_flush (DeltaBuf *db)
	Flush the delta cycle buffer the delta coefficients left in the cycle buffer.
CMNWork *	CMN_realtime_new (Value *para, float weight)
	Initialize MAP-CMN at startup.
void	CMN_realtime_free (CMNWork *c)
	Free work area for real-time CMN.
void	CMN_realtime_prepare (CMNWork *c)
	Prepare for MAP-CMN at start of each input.
void	CMN_realtime (CMNWork c, float mfcc)
	Perform MAP-CMN for incoming MFCC vectors.
void	CMN_realtime_update (CMNWork c, HTK_Param param)
	Update initial cepstral mean from previous utterances for next input.
static boolean	myread (void buf, size_t unitbyte, int unitnum, FILE fp)
	Read binary with byte swap (assume file is Big Endian).
static boolean	mywrite (void *buf, size_t unitbyte, size_t unitnum, int fd)
	Write binary with byte swap (assume data is Big Endian).
boolean	CMN_load_from_file (CMNWork c, char filename)
	Load CMN parameter from file.
boolean	CMN_save_to_file (CMNWork c, char filename)
	Save the current CMN vector to a file.
void	energy_max_init (ENERGYWork *energy)
	Initialize work area for energy normalization on live input.
void	energy_max_prepare (ENERGYWork energy, Value para)
	Prepare values for energy normalization on live input.
LOGPROB	energy_max_normalize (ENERGYWork energy, LOGPROB f, Value para)
	Peform energy normalization using maximum of last input.