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]
マクロ定義
#define	CD_STATE_SET_STEP   10
	CD_State_Set memory allocation step.
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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