Context-Dependent HMM set

同じベース音素の同じ位置にあるHMM状態の集合 [詳細]

データ構造
struct	CD_State_Set
	Context-dependent state set, equivalent to HTK_HMM_State, part of pseudo phone [詳細]
struct	CD_State_Set
	Context-dependent state set, equivalent to HTK_HMM_State, part of pseudo phone [詳細]
struct	_cd_set
	Context-dependent HMM set (called "pseudo") for a logical context [詳細]
struct	HMM_CDSET_INFO
	Top structure to hold all the HMM sets [詳細]
struct	_HMM_logical
	Logical HMM to map logical names to physical/pseudo HMM [詳細]
#define	CD_STATE_SET_STEP   10
	CD_State_Set memory allocation step
static void	cdset_init (HTK_HMM_INFO *hmminfo)
static CD_Set *	cdset_new ()
CD_Set *	cdset_lookup (HTK_HMM_INFO *hmminfo, char *cdstr)
CD_Set *	lcdset_lookup_by_hmmname (HTK_HMM_INFO *hmminfo, char *hmmname)
CD_Set *	rcdset_lookup_by_hmmname (HTK_HMM_INFO *hmminfo, char *hmmname)
static void	put_cdset (void *ptr)
void	put_all_cdinfo (HTK_HMM_INFO *hmminfo)
boolean	regist_cdset (APATNODE **root, HTK_HMM_Data *d, char *cdname)
boolean	remove_cdset (HTK_HMM_INFO *hmminfo, char *cdname)
boolean	make_cdset (HTK_HMM_INFO *hmminfo)
static void	callback_free_lcdset_content (void *arg)
void	free_cdset (APATNODE **root)
型定義
typedef _cd_set	CD_Set
	Context-dependent HMM set (called "pseudo") for a logical context
typedef _HMM_logical	HMM_Logical
	Logical HMM to map logical names to physical/pseudo HMM

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説明

同じベース音素の同じ位置にあるHMM状態の集合

この構造体は第１パスで単語間トライフォンを扱うのに用いられます． 木構造化辞書上で，単語の末端のトライフォンHMMにおける各状態は， 通常のHMMとは異なりその終端音素と同じベース音素を持つトライフォンの 同じ位置の状態のリストを持ちます．このリスト化されたコンテキスト依存 HMMの集合は，"pseudo" phone とも呼ばれます．

第１パス計算時には，その状態の音響尤度は，真の単語間トライフォンの 近似値として，リスト中の各状態の音響尤度の最大値（あるいは平均値， あるいはNbestの状態の平均値）が用いられる．

この近似値は第２パスで再計算される．

参照:

htk_hmm.h

libsent/src/hmminfo/cdhmm.c

libsent/src/hmminfo/cdset.c

libsent/src/hmminfo/guess_cdHMM.c

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型定義

typedef struct _cd_set CD_Set

Context-dependent HMM set (called "pseudo") for a logical context

Context-dependent HMM set for a logical context (e.g. "a-k", "e+b", "e", each corresponds to triphone list of "a-k+*", "*-e+b", "*-e+*").

typedef struct _HMM_logical HMM_Logical

Logical HMM to map logical names to physical/pseudo HMM

This data maps logical HMM name to physical (defined) HMM or pseudo HMM. The logical HMM names are basically loaded from HMMList mapping file. Biphone/monophone HMM names, not listed in the HMMList file, are mapped to pseudo phones, which represents the context-dependent HMM set.

For example, if logical biphone HMM name "e-k" is defined in HMM definition file or its mapping is specified in the HMMList file, the Logical HMM name "e-k" will be mapped to the corresponding defined HMM. If "e-k" does not exist in both HMM definition file and HMMList file, triphones whose name matches "e-k+*" will be gathered to phone context-dependent HMM set "e-k", and the logical HMM name "e-k" will be mapped to this HMM set.

The context-dependent HMM is also called a "pseudo" phone in Julius.

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関数

static void cdset_init

(

HTK_HMM_INFO *

hmminfo

)

[static]

Initialize total pseudo HMM information in the given HMM definition data.

引数:

hmminfo

[i/o] HTK HMM definitions

cdset.c の 87 行で定義されています。

参照元 make_cdset().

static CD_Set* cdset_new

(

)

[static]

Allocate a CD_Set data for a new pseudo phone set.

戻り値:

pointer to newly allocated CD_Set.

cdset.c の 98 行で定義されています。

参照元 regist_cdset().

CD_Set* cdset_lookup	(	HTK_HMM_INFO *	hmminfo,
		char *	cdstr
	)

Look up for a pseudo phone with the name, and return the content.

引数:

	hmminfo	[in] HMM information to search for.
	cdstr	[in] string of pseudo phone name to search.

戻り値:

pointer to the pseudo phone if found, or NULL if not found.

cdset.c の 112 行で定義されています。

参照元 hmm_add_pseudo_phones_sub()・lcdset_lookup_by_hmmname()・rcdset_lookup_by_hmmname().

CD_Set* lcdset_lookup_by_hmmname	(	HTK_HMM_INFO *	hmminfo,
		char *	hmmname
	)

Look up for a pseudo phone by the "left - center" name of the given phone name.

引数:

	hmminfo	[in] HMM information to search for.
	hmmname	[in] string of the phone name.

戻り値:

pointer to the pseudo phone if found, or NULL if not found.

cdset.c の 132 行で定義されています。

参照元 outprob_style()・wchmm_add_word().

CD_Set* rcdset_lookup_by_hmmname	(	HTK_HMM_INFO *	hmminfo,
		char *	hmmname
	)

Look up for a pseudo phone by the "center + right" name of the given phone name.

引数:

	hmminfo	[in] HMM information to search for.
	hmmname	[in] string of the phone name.

戻り値:

pointer to the pseudo phone if found, or NULL if not found.

cdset.c の 148 行で定義されています。

static void put_cdset

(

void *

ptr

)

[static]

Output text information of a pseudo phone to stdout.

引数:

ptr

[in] pointer to a pseudo phone set.

cdset.c の 162 行で定義されています。

参照元 put_all_cdinfo().

void put_all_cdinfo

(

HTK_HMM_INFO *

hmminfo

)

Output all pseudo phone set information to stdout

引数:

hmminfo

[in] HMM definition data that holds pseudo phone data.

cdset.c の 190 行で定義されています。

boolean regist_cdset	(	APATNODE **	root,
		HTK_HMM_Data *	d,
		char *	cdname
	)

Register a physical HMM as a member of a pseudo phone set.

引数:

	root	[i/o] root node of HMM search index node.
	d	[in] a physical defined HMM to be added.
	cdname	[in] name of the pseudo phone set.

戻り値:

TRUE if newly registered, FALSE if the specified physical HMM already exists in the pseudo phone.

cdset.c の 206 行で定義されています。

参照元 make_cdset().

boolean remove_cdset	(	HTK_HMM_INFO *	hmminfo,
		char *	cdname
	)

Remove an pseudo phone set entry from index tree

引数:

	hmminfo
	cdname

戻り値:

cdset.c の 318 行で定義されています。

boolean make_cdset

(

HTK_HMM_INFO *

hmminfo

)

Construct the whole pseudo HMM information, and also add them to the logical Triphone tree.

引数:

hmminfo

[i/o] HMM definition data. The generated data will also be stored within this.

戻り値:

TRUE on success, FALSE on failure.

cdset.c の 351 行で定義されています。

参照元 initialize_HMM().

static void callback_free_lcdset_content

(

void *

arg

)

[static]

callback for aptree function to free the content of pseudo phone set.

引数:

arg

[in] pointer to the pseudo phone set to be free

cdset.c の 388 行で定義されています。

参照元 free_cdset().

void free_cdset

(

APATNODE **

root

)

Remove all the registered category-indexed pseudo state sets. This function will be called when a grammar is changed to re-build the state sets.

引数:

root

[i/o] pointer to hold the root index pointer

cdset.c の 410 行で定義されています。

参照元 hmminfo_free().

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