/**************************************************************************/
/*                            File: hmm_model.h                           */
/**************************************************************************/
/* Project: Continuous Speech Recognition Search Algorithms               */
/* Author: Neeraj Deshmukh, Aravind Ganapathiraju                         */
/* Class: EE 8993 Spring 1996                        Date: March 12, 1996 */
/**************************************************************************/

/*========================================================================
  This file declares the HMM  class that models the various phonemes
  (triphones) for the EE 8993 speech recognizer
  ========================================================================*/

/*------------------------------------------------------------------------
  make sure definitions are only made once
  ------------------------------------------------------------------------*/
#ifndef __ISIP_HMM
#define __ISIP_HMM

/*------------------------------------------------------------------------
  system and ISIP include files
  ------------------------------------------------------------------------*/
#include "hmm_matrix.h"
#include "hmm_state.h"
#include "linked_list.h"

/*------------------------------------------------------------------------
  forward declaration of classes
  ------------------------------------------------------------------------*/
class HMM_model;
class HMM_Matrix;
class HMM_State;
class HMM_Trans_State;
class Linked_List;

#define DEFAULT_NUM_OF_STATES 5

class HMM_Model {

protected:

  int_2 num_of_states_d;
  HMM_State *states;
  String model_symbol_d;


  //public methods
  //
public:
  
  /*---------------------------
    constructors and destructor
    ---------------------------*/
  //default constructor
  //
  HMM_Model( String model_symbol_l = NULL, 
	     int_2 num_of_states_l = DEFAULT_NUM_OF_STATES);
  
  ~HMM_Model(); 
  
  /*----------------------
    input / output methods
    ----------------------*/
  void set_model_symbol_cc ( String model_symbol_l );
  String get_model_symbol_cc ();
  void set_num_of_states_cc ( int_2 num_of_states_l );
  float_8 get_trans_score_cc (String from_state_name, String to_state_name ); 
  HMM_State *add_state_cc ( String state_name );
  HMM_State *get_states_cc ();
  HMM_State *get_start_state_cc ();
  HMM_State *get_stop_state_cc ();
  
  /*----------------------
    calculating methods
    ----------------------*/

};

#endif