approx_cont_mgau.h

CMU大名鼎鼎的SPHINX－3大词汇量连续语音识别系统

/* ====================================================================
 * Copyright (c) 1999-2004 Carnegie Mellon University.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * This work was supported in part by funding from the Defense Advanced 
 * Research Projects Agency and the National Science Foundation of the 
 * United States of America, and the CMU Sphinx Speech Consortium.
 *
 * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND 
 * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
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/*
 * approx_cont_mgau.h
 * 
 * **********************************************
 * CMU ARPA Speech Project
 *
 * Copyright (c) 1999 Carnegie Mellon University.
 * ALL RIGHTS RESERVED.
 * **********************************************
 * 
 * HISTORY
 * 
 * 23-Jan-2004 Arthur Chan ([e-mail])
 *             started
 */


#ifndef _S3_APPROXCONGAU_H_
#define _S3_APPROXCONGAU_H_

#include "cont_mgau.h"
#include "vector.h"
#include "subvq.h"
#include "gs.h"
#include "kb.h"

#ifdef __cplusplus
extern "C" {
#endif

  /** \file approx_cont_mgau.h
   * \brief Master function to compute the approximate score of mixture of Gaussians 
      \warning You need to have some knowledge in fast GMM computation in order to modifed this function. 
      
   This is the current schemes included:
   1, VQ-based Gaussian Selection 
   2, Subvq-based Gaussian Selection
   3, Context Independent Phone-based GMM Selection
   4, Down Sampling 
      a, dumb approach,
      b, conditional down sampling (currently can only be used with VQ-based Gaussian Selection
      c, distance-based down sampling 
      
      The above method of categorizing GMM computation in 4 levels are
      presented in ICSLP 2004.  For the publication, please visit
      Arthur Chan's web site at www.cs.cmu.edu/~archan/ .  
  */

  /**
 * Evaluate the approximation gaussian score for one frame. 
 */
int32 approx_cont_mgau_frame_eval (kbcore_t * kbc,  /** Input, kbcore, for mdef, svq and gs*/
				   fast_gmm_t *fastgmm,	 /** Input/Output: wrapper for
							    parameters for Fast GMM , for
							    all beams and parameters, during
							    the computation, the */
				   float32 *feat,	/**Input: the current feature vector */
				   int32 frame,         /**Input: the current frame number */
				   int32 *sen_active,	/**Input: the current active senones */
				   int32 *rec_sen_active, /**Input: the most recent active senones */
				   int32 *senscr,         /**Output: the output senone scores */
				   int32 *cache_ci_senscr, /**Input: the CI senone scores for CI GMMS */
				   ptmr_t *tm_ovrhd        /**Output: the timer used for computing overhead */
				   );


  /**
   * Evaluate the approximation gaussian score for CI senone for one frame. 
   */

void approx_cont_mgau_ci_eval (
			       kbcore_t *kbc, /** Input, kbcore, for mdef, svq and gs*/
			       fast_gmm_t *fg, /** Input/Output: wrapper for
							    parameters for Fast GMM , for
							    all beams and parameters, during
							    the computation, the */
			       mdef_t *mdef,  /** Input : model definition */
			       float32 *feat, /* Input : the current frame of feature */
			       int32 *ci_senscr /* Output : the ci senscore for this frame */
			       );

#ifdef __cplusplus
}
#endif

#endif