hlat.h

隐马尔科夫模型工具箱

/* ----------------------------------------------------------- */
/*                                                             */
/*                          ___                                */
/*                       |_| | |_/   SPEECH                    */
/*                       | | | | \   RECOGNITION               */
/*                       =========   SOFTWARE                  */ 
/*                                                             */
/*                                                             */
/* ----------------------------------------------------------- */
/* developed at:                                               */
/*                                                             */
/*      Speech Vision and Robotics group                       */
/*      Cambridge University Engineering Department            */
/*      http://svr-www.eng.cam.ac.uk/                          */
/*                                                             */
/* ----------------------------------------------------------- */
/*         Copyright:                                          */
/*         2001-2002  Cambridge University                     */
/*                    Engineering Department                   */
/*                                                             */
/*   Use of this software is governed by a License Agreement   */
/*    ** See the file License for the Conditions of Use  **    */
/*    **     This banner notice must not be removed      **    */
/*                                                             */
/* ----------------------------------------------------------- */
/*       File: HLat.h:  Lattice Manipulation                   */
/* ----------------------------------------------------------- */

/* !HVER!HLat:   3.2 [CUED 09/12/02] */


#ifndef _HLAT_H_
#define _HLAT_H_

#ifdef __cplusplus
extern "C" {
#endif

/* ------------------------ Initialisation --------------------------- */

void InitLat (void);
/*
   register module & set configuration parameters
*/

/* ------------------------ Datatype ----------------------------- */

/* Forward-Backward info structre attached to LNodes
     use doubles for imporved accuracy
*/
typedef struct FBlnodeInfo {
   LogDouble fwlike;     /* forward likelihood */
   LogDouble bwlike;     /* backward likelihood */
} FBinfo;

#define LNodeFw(ln)  (((FBinfo *) (ln)->hook)->fwlike)
#define LNodeBw(ln)  (((FBinfo *) (ln)->hook)->bwlike)

typedef enum {LATFB_SUM, LATFB_MAX} LatFBType;


/* ------------------------ Prototypes --------------------------- */

Transcription *LatFindBest (MemHeap *heap, Lattice *lat, int N);

Lattice *LatPrune (MemHeap *heap, Lattice *lat, LogDouble thresh, float arcsPerSec);

void CalcStats (Lattice *lat);

LNode *LatStartNode (Lattice *lat);

LNode *LatEndNode (Lattice *lat);

void LatSetBoundaryWords (char *start, char *end, char  *startLM, char *endLM);

void LatCheck (Lattice *lat);

void FixBadLat (Lattice *lat);

void FixPronProbs (Lattice *lat, Vocab *voc);

Boolean LatTopSort (Lattice *lat, LNode **topOrder);

void LatAttachInfo (MemHeap *heap, size_t size, Lattice *lat);
void LatDetachInfo (MemHeap *heap, Lattice *lat);

LogDouble LatForwBackw (Lattice *lat, LatFBType type);


#ifndef NO_LAT_LM
Lattice *LatExpand (MemHeap *heap, Lattice *lat, LModel *lm);
#endif

#ifdef __cplusplus
}
#endif

#endif  /* _HLAT_H_ */