1 /** 2 * @file hmm.h 3 * 4 * <EN> 5 * @brief Hidden Marcov Model for recognition. 6 * 7 * This file defines %HMM instance structure for recognition. 8 * When recognition, the required word %HMM or tree lexicon will be built 9 * using these structures referencing word dictionary and HTK %HMM Acoustic 10 * Model (defined in htk_hmm.h), and actual likelihood computation. 11 * </EN> 12 * <JA> 13 * @brief ǧ�����Ѥ� Hidden Marcov Model 14 * 15 * ���Υե�����Ǥ�, ǧ���ˤ�����%HMM�ι�¤�Τ�������Ƥ��ޤ��� 16 * ǧ�����ˤ�, ������Ӳ�����ǥ빽¤�� (htk_hmm.h) ���� 17 * ɬ�פ�ñ��%HMM���ڹ�¤���������ι�¤�Τ��Ѥ��ƹ��ۤ���, 18 * �������ٷ��Ϥ��ξ�ǹԤ��ޤ��� 19 * </JA> 20 * 21 * @author Akinobu LEE 22 * @date Thu Feb 10 14:54:06 2005 23 * 24 * $Revision: 1.2 $ 25 * 26 */ 27 /* 28 * Copyright (c) 1991-2007 Kawahara Lab., Kyoto University 29 * Copyright (c) 2000-2005 Shikano Lab., Nara Institute of Science and Technology 30 * Copyright (c) 2005-2007 Julius project team, Nagoya Institute of Technology 31 * All rights reserved 32 */ 33 34 #ifndef __SENT_HMM_NEW2_H__ 35 #define __SENT_HMM_NEW2_H__ 36 37 #include <sent/stddefs.h> 38 #include <sent/htk_hmm.h> 39 #include <sent/htk_param.h> 40 #include <sent/hmm_calc.h> 41 42 /// Transition arc of %HMM state 43 typedef struct _a_cell { 44 LOGPROB a; ///< Transition probability in log10 45 int arc; ///< Transition destination in state ID 46 struct _a_cell *next; ///< Pointer to next transition on the same state 47 } A_CELL; 48 49 /// %HMM State 50 typedef struct { 51 A_CELL *ac; ///< List of transition arcs from this state 52 /** 53 * @brief Pointer to corresponding output state definition 54 * 55 * When a triphone model is used, if this state is located as a 56 * part of phoneme %HMM on @em word-edge, the corresponding 57 * @em pseudo-triphone, i.e. "*-e+g", "k-a+*", should be assigned. 58 * Otherwise, i.e. if this state is located at @em internal position 59 * of a word, pointer to the corresponding @em physical 60 * (actually defined) %HMM will be assigned. 61 * When a triphone model is used, phoneme %HMMs on @em word-edge should 62 * be @em pseudo-triphone, i.e. "*-e+g", "k-a+*". In this case, the 63 * belonging state should hold the output probability function 64 * in CD_State_Set. 65 * Otherwise, i.e. if this state is located at @em internal position 66 * of a word, pointer to the corresponding @em physical 67 * (actually defined) %HMM will be assigned. 68 */ 69 union { 70 HTK_HMM_State *state; ///< Pointer to the mapped physical %HMM 71 CD_State_Set *cdset; ///< Pointer to the pseudo %HMM 72 } out; 73 boolean is_pseudo_state; ///< TRUE if pseudo %HMM is assigned, FALSE if physical %HMM is assigned 74 } HMM_STATE; 75 76 /** 77 * @brief %HMM state sequence 78 * 79 * @note This assumes that there is only one transition that goes outside 80 * this %HMM state sequence. 81 */ 82 typedef struct { 83 int len; ///< Length of state 84 HMM_STATE *state; ///< Array of state 85 LOGPROB accept_ac_a; ///< Transition probability outside this sequence (fixed to one) for normal mode 86 } HMM; 87 88 89 /** 90 * Token definition for viterbi segmentation. 91 * 92 */ 93 typedef struct _seg_token { 94 int last_id; ///< ID of last unit 95 int last_end_frame; ///< Frame at which the last unit ends 96 LOGPROB last_end_score; ///< Score at which the last unit ends 97 struct _seg_token *next; ///< Pointer to previous token context, NULL if no context 98 struct _seg_token *list; ///< Link to next token, NULL if last 99 } SEGTOKEN; 100 101 /* mkwhmm.c */ 102 HMM *new_make_word_hmm(HTK_HMM_INFO *, HMM_Logical **, int, boolean *); 103 HMM *new_make_word_hmm_with_lm(HTK_HMM_INFO *, HMM_Logical **, int, boolean *, LOGPROB *); 104 void free_hmm(HMM *); 105 /* vsegment.c */ 106 LOGPROB viterbi_segment(HMM *hmm, HTK_Param *param, HMMWork *wrk, boolean multipath, int *endstates, int ulen, int **id_ret, int **seg_ret, LOGPROB **uscore_ret, int *retlen); 107 108 /* hmminfo/outprob.c */ 109 LOGPROB outprob(HMMWork *wrk, int t, HMM_STATE *hmmstate, HTK_Param *param); 110 /* hmminfo/put_htkdata_info */ 111 void put_hmm_arc(FILE *fp, HMM *d); 112 void put_hmm_outprob(FILE *fp, HMM *d); 113 void put_hmm(FILE *fp, HMM *d); 114 115 #endif /* __SENT_HMM_NEW2_H__ */ 116