libsent/src/wav2mfcc/wav2mfcc-pipe.c

音声波形から MFCC 特徴量へ変換する (フレーム単位) [詳細]

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

wav2mfcc-pipe.cのインクルード依存関係図

ソースコードを見る。

データ構造

struct CMEAN

マクロ定義

#define CPMAX 500

Maximum number of frames to store ceptral mean for CMN update

#define CPSTEP 5

clist allocate step

関数

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

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)

void energy_max_init ()

void energy_max_prepare (Value *para)

LOGPROB energy_max_normalize (LOGPROB f, Value *para)

変数

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

static LOGPROB energy_max_last

Maximum energy value of last input

static LOGPROB energy_min_last

Minimum floored energy value of last input

static LOGPROB energy_max

Maximum energy value of current input

説明

音声波形から MFCC 特徴量へ変換する (フレーム単位)

作者:: Akinobu LEE

日付:: Thu Feb 17 18:12:30 2005

ここでは wav2mfcc.c の関数をフレーム同期に処理するために変換した関数が納められています．認識処理を音声入力と平行して行う場合，こちらの関数が用いられます．

Revision: 1.9

wav2mfcc-pipe.c で定義されています。

関数

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

initialize and setup buffers for a MFCC computataion.

引数:

	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

wav2mfcc-pipe.c の 57 行で定義されています。

参照元 RealTimeInit()・Wav2MFCC().

DeltaBuf* WMP_deltabuf_new	(	int	veclen,
		int	windowlen
	)

Allocate a new delta cycle buffer.

引数:

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

戻り値:: pointer to newly allocated delta cycle buffer structure.

wav2mfcc-pipe.c の 83 行で定義されています。

参照元 RealTimeInit().

void WMP_deltabuf_free ( DeltaBuf * db )

Destroy the delta cycle buffer.

引数:

[i/o] delta cycle buffer

wav2mfcc-pipe.c の 110 行で定義されています。

void WMP_deltabuf_prepare ( DeltaBuf * db )

Reset and clear the delta cycle buffer.

引数:

[i/o] delta cycle buffer

wav2mfcc-pipe.c の 128 行で定義されています。

参照元 RealTimePipeLinePrepare().

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

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

引数:

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

wav2mfcc-pipe.c の 144 行で定義されています。

参照元 WMP_deltabuf_flush()・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.

引数:

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

戻り値:: 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.

wav2mfcc-pipe.c の 187 行で定義されています。

参照元 RealTimeParam()・RealTimePipeLine().

boolean WMP_deltabuf_flush ( DeltaBuf * db )

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

引数:

[i/o] delta cycle buffer

戻り値:: 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.

wav2mfcc-pipe.c の 229 行で定義されています。

参照元 RealTimeParam().

void CMN_realtime_init	(	int	dimension,
		float	weight
	)

Initialize MAP-CMN at startup.

引数:

	dimension	[in] vector dimension
	weight	[in] initial cepstral mean weight

wav2mfcc-pipe.c の 290 行で定義されています。

参照元 RealTimeInit().

void CMN_realtime_prepare ( )

Prepare for MAP-CMN at start of each input

wav2mfcc-pipe.c の 317 行で定義されています。

参照元 RealTimePipeLinePrepare().

void CMN_realtime	(	float *	mfcc,
		int	dim
	)

Perform MAP-CMN for incoming MFCC vectors

引数:

	mfcc	[in] MFCC vector
	dim	[in] dimension

wav2mfcc-pipe.c の 332 行で定義されています。

参照元 RealTimeParam()・RealTimePipeLine().

void CMN_realtime_update ( )

Update initial cepstral mean from previous utterances for next input.

wav2mfcc-pipe.c の 360 行で定義されています。

参照元 RealTimeCMNUpdate().

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

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

引数:

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

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

wav2mfcc-pipe.c の 414 行で定義されています。

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

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

引数:

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

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

wav2mfcc-pipe.c の 436 行で定義されています。

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.

引数:

	filename	[in] file name
	dim	[in] required number of MFCC dimensions

戻り値:: TRUE on success, FALSE on failure.

wav2mfcc-pipe.c の 460 行で定義されています。

参照元 RealTimeInit().

boolean CMN_save_to_file ( char * filename )

Save the current CMN vector to a file.

引数:

filename

[in] filename to save the data.

戻り値:: TRUE on success, FALSE on failure.

wav2mfcc-pipe.c の 504 行で定義されています。

参照元 RealTimeCMNUpdate().

void energy_max_init ( )

Initialize work area for energy normalization on live input. This should be called once on startup.

wav2mfcc-pipe.c の 543 行で定義されています。

参照元 RealTimeInit().

void energy_max_prepare ( Value * para )

Prepare values for energy normalization on live input. This should be called before each input segment.

引数:

para

[in] MFCC computation configuration parameter

wav2mfcc-pipe.c の 555 行で定義されています。

参照元 RealTimePipeLinePrepare().

LOGPROB energy_max_normalize	(	LOGPROB	f,
		Value *	para
	)

Peform energy normalization using maximum of last input.

引数:

	f	[in] raw energy
	para	[in] MFCC computation configuration parameter

戻り値:: value of the normalized log energy.

wav2mfcc-pipe.c の 571 行で定義されています。

参照元 RealTimePipeLine().

Juliusに対してTue Dec 26 16:21:23 2006に生成されました。

1.5.0


データ構造
struct	CMEAN
マクロ定義
#define	CPMAX 500
	Maximum number of frames to store ceptral mean for CMN update
#define	CPSTEP 5
	clist allocate step
関数
void	WMP_init (Value para, float *bf, float ssbuf, int ssbuflen)
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)
void	energy_max_init ()
void	energy_max_prepare (Value *para)
LOGPROB	energy_max_normalize (LOGPROB f, Value *para)
変数
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
static LOGPROB	energy_max_last
	Maximum energy value of last input
static LOGPROB	energy_min_last
	Minimum floored energy value of last input
static LOGPROB	energy_max
	Maximum energy value of current input