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 dependency graph for wav2mfcc-pipe.c:

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Defines
#define	CPMAX   500
	Maximum number of frames to store ceptral mean for CMN update.
#define	CPSTEP   5
	clist allocate step
Functions
void	WMP_init (Value para, float **bf, float *ssbuf, int ssbuflen)
void	WMP_calc (float *mfcc, float *bf, Value para, float *ssbuf)
DeltaBuf *	WMP_deltabuf_new (int veclen, int windowlen)
void	WMP_deltabuf_free (DeltaBuf *db)
void	WMP_deltabuf_prepare (DeltaBuf *db)
static void	WMP_deltabuf_calc (DeltaBuf *db, int cur)
boolean	WMP_deltabuf_proceed (DeltaBuf *db, float *new_mfcc)
boolean	WMP_deltabuf_flush (DeltaBuf *db)
void	CMN_realtime_init (int dimension, float weight)
void	CMN_realtime_prepare ()
void	CMN_realtime (float *mfcc, int dim)
void	CMN_realtime_update ()
static boolean	myread (void *buf, size_t unitbyte, int unitnum, FILE *fp)
static boolean	mywrite (void *buf, size_t unitbyte, int unitnum, int fd)
boolean	CMN_load_from_file (char *filename, int dim)
boolean	CMN_save_to_file (char *filename)
Variables
static double *	fbank
	Local buffer to hold filterbank.
static FBankInfo	fb
	Local buffer to hold filterbank information.
static CMEAN *	clist
	List of MFCC sum for previous inputs.
static int	clist_max
	Allocated number of CMEAN in clist.
static int	clist_num
	Currentlly filled CMEAN in clist.
static int	dim
	Local workarea to store the number of MFCC dimension.
static float	cweight
	Weight of initial cepstral mean.
static float *	cmean_init
	Initial cepstral mean for each input.
static boolean	cmean_init_set
	TRUE if cmean_init was set.
static CMEAN	now
	Work area to hold current cepstral mean.

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Detailed Description

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

Author:

Akinobu LEE

Date:

Thu Feb 17 18:12:30 2005

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

Revision

1.5

Definition in file wav2mfcc-pipe.c.

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Function Documentation

void WMP_init (  Value  para, float **  bf, float *  ssbuf, int  ssbuflen )

initialize and setup buffers for a MFCC computataion. Parameters: para  [in] configuration parameters bf  [out] pointer to the entry point of workspace for FFT ssbuf  [in] noise spectrum, or NULL if not using spectral subtraction ssbuflen  [in] length of above, ignoredwhen ssbuf is NULL Definition at line 60 of file wav2mfcc-pipe.c. Referenced by RealTimeInit().

void WMP_calc (  float *  mfcc, float *  bf, Value  para, float *  ssbuf )

Calculate MFCC and log energy for one frame. Perform spectral subtraction if ssbuf is specified. Parameters: mfcc  [out] buffer to hold the resulting MFCC vector bf  [i/o] work area for FFT para  [in] configuration parameters ssbuf  [in] noise spectrum, or NULL if not using spectral subtraction Definition at line 95 of file wav2mfcc-pipe.c. Referenced by RealTimePipeLine().

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 141 of file wav2mfcc-pipe.c. Referenced by RealTimeInit().

void WMP_deltabuf_free (  DeltaBuf *  db  )

Destroy the delta cycle buffer. Parameters: db  [i/o] delta cycle buffer Definition at line 168 of file wav2mfcc-pipe.c.

void WMP_deltabuf_prepare (  DeltaBuf *  db  )

Reset and clear the delta cycle buffer. Parameters: db  [i/o] delta cycle buffer Definition at line 186 of file wav2mfcc-pipe.c. Referenced by RealTimePipeLinePrepare().

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 202 of file wav2mfcc-pipe.c. Referenced by 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 245 of file wav2mfcc-pipe.c. Referenced by RealTimeParam(), and RealTimePipeLine().

boolean WMP_deltabuf_flush (  DeltaBuf *  db  )

Flush the delta cycle buffer the delta coefficients left in the cycle buffer. Parameters: db  [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 287 of file wav2mfcc-pipe.c. Referenced by RealTimeParam().

void CMN_realtime_init (  int  dimension, float  weight )

Initialize MAP-CMN at startup. Parameters: dimension  [in] vector dimension weight  [in] initial cepstral mean weight Definition at line 348 of file wav2mfcc-pipe.c. Referenced by RealTimeInit().

void CMN_realtime_prepare (   )

Prepare for MAP-CMN at start of each input Definition at line 375 of file wav2mfcc-pipe.c. Referenced by RealTimePipeLinePrepare().

void CMN_realtime (  float *  mfcc, int  dim )

Perform MAP-CMN for incoming MFCC vectors Parameters: mfcc  [in] MFCC vector dim  [in] dimension Definition at line 390 of file wav2mfcc-pipe.c. Referenced by RealTimeParam(), and RealTimePipeLine().

void CMN_realtime_update (   )

Update initial cepstral mean from previous utterances for next input. Definition at line 418 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 472 of file wav2mfcc-pipe.c.

static boolean mywrite (  void *  buf, size_t  unitbyte, int  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 494 of file wav2mfcc-pipe.c.

boolean CMN_load_from_file (  char *  filename, int  dim )

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: filename  [in] file name dim  [in] required number of MFCC dimensions Returns: TRUE on success, FALSE on failure. Definition at line 518 of file wav2mfcc-pipe.c. Referenced by RealTimeInit().

boolean CMN_save_to_file (  char *  filename  )

Save the current CMN vector to a file. Parameters: filename  [in] filename to save the data. Returns: TRUE on success, FALSE on failure. Definition at line 562 of file wav2mfcc-pipe.c. Referenced by RealTimeCMNUpdate().

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