hmm.java

来自「It is the Speech recognition software. 」· Java 代码 · 共 73 行

/*
 * Copyright 1999-2002 Carnegie Mellon University.  
 * Portions Copyright 2002 Sun Microsystems, Inc.  
 * Portions Copyright 2002 Mitsubishi Electric Research Laboratories.
 * All Rights Reserved.  Use is subject to license terms.
 * 
 * See the file "license.terms" for information on usage and
 * redistribution of this file, and for a DISCLAIMER OF ALL 
 * WARRANTIES.
 *
 */

package edu.cmu.sphinx.linguist.acoustic;


/**
 * Represents a hidden-markov-model. An HMM consists of a unit
 * (context dependent or independent), a transition matrix from state
 * to state, and a sequence of senones associated with each state.
 * This representation of an HMM is a specialized left-to-right markov
 * model. No backward transitions are allowed.  
 *
 */
public interface HMM {

    /**
     * Gets the  unit associated with this HMM
     *
     * @return the unit associated with this HMM
     */
    public Unit getUnit();

    /**
     * Gets the  base unit associated with this HMM
     *
     * @return the unit associated with this HMM
     */
    public Unit getBaseUnit();

    /**
     * Retrieves the hmm state 
     *
     * @param which the state of interest
     */
    public HMMState getState(int which);


    /**
     * Returns the order of the HMM
     *
     * @return the order of the HMM
     */
    public int getOrder() ;


    /**
     * Retrieves the position of this HMM. 
     *
     * @return the position for this HMM
     */
    public HMMPosition getPosition() ;

    /**
     * Gets the initial states (with probabilities) for this HMM
     *
     * @return the set of arcs that transition to the initial states
     * for this HMM
     */
    public HMMState getInitialState();
}