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192 lines
6.0 KiB
C
192 lines
6.0 KiB
C
/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
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/* ====================================================================
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* Copyright (c) 1999-2004 Carnegie Mellon University. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* This work was supported in part by funding from the Defense Advanced
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* Research Projects Agency and the National Science Foundation of the
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* United States of America, and the CMU Sphinx Speech Consortium.
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*
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* THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
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* ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
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* NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ====================================================================
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*
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*/
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/*
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* cmn.h -- Various forms of cepstral mean normalization
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*
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* **********************************************
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* CMU ARPA Speech Project
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*
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* Copyright (c) 1999 Carnegie Mellon University.
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* ALL RIGHTS RESERVED.
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* **********************************************
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*
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* HISTORY
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* $Log$
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* Revision 1.1 2006/04/05 20:27:30 dhdfu
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* A Great Reorganzation of header files and executables
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*
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* Revision 1.13 2006/02/23 03:48:27 arthchan2003
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* Resolved conflict in cmn.h
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*
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*
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* Revision 1.12 2006/02/22 23:43:55 arthchan2003
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* Merged from the branch SPHINX3_5_2_RCI_IRII_BRANCH: Put data structure into the cmn_t structure.
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*
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* Revision 1.11.4.2 2005/10/17 04:45:57 arthchan2003
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* Free stuffs in cmn and feat corectly.
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*
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* Revision 1.11.4.1 2005/07/05 06:25:08 arthchan2003
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* Fixed dox-doc.
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*
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* Revision 1.11 2005/06/21 19:28:00 arthchan2003
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* 1, Fixed doxygen documentation. 2, Added $ keyword.
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*
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* Revision 1.4 2005/06/13 04:02:56 archan
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* Fixed most doxygen-style documentation under libs3decoder.
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*
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* Revision 1.3 2005/03/30 01:22:46 archan
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* Fixed mistakes in last updates. Add
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*
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*
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* 20.Apr.2001 RAH (rhoughton@mediasite.com, ricky.houghton@cs.cmu.edu)
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* Added cmn_free() and moved *mean and *var out global space and named them cmn_mean and cmn_var
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*
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* 28-Apr-1999 M K Ravishankar (rkm@cs.cmu.edu) at Carnegie Mellon University
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* Copied from previous version.
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*/
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#ifndef _S3_CMN_H_
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#define _S3_CMN_H_
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/* Win32/WinCE DLL gunk */
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#include <sphinxbase/sphinxbase_export.h>
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#include <sphinxbase/prim_type.h>
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#include <sphinxbase/fe.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if 0
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/* Fool Emacs. */
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}
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#endif
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/** \file cmn.h
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* \brief Apply Cepstral Mean Normalization (CMN) to the set of input mfc frames.
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*
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* By subtractingthe mean of the input from each frame. C0 is also included in this process.
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* This function operates on an entire utterance at a time. Hence, the entire utterance
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* must be available beforehand (batchmode).
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*/
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/**
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* Types of cepstral mean normalization to apply to the features.
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*/
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typedef enum cmn_type_e {
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CMN_NONE = 0,
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CMN_CURRENT,
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CMN_PRIOR
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} cmn_type_t;
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/** String representations of cmn_type_t values. */
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SPHINXBASE_EXPORT
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extern const char *cmn_type_str[];
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/** Convert string representation (from command-line) to cmn_type_t */
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SPHINXBASE_EXPORT
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cmn_type_t cmn_type_from_str(const char *str);
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/** \struct cmn_t
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* \brief wrapper of operation of the cepstral mean normalization.
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*/
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typedef struct {
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mfcc_t *cmn_mean; /**< Temporary variable: current means */
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mfcc_t *cmn_var; /**< Temporary variables: stored the cmn variance */
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mfcc_t *sum; /**< The sum of the cmn frames */
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int32 nframe; /**< Number of frames */
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int32 veclen; /**< Length of cepstral vector */
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} cmn_t;
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SPHINXBASE_EXPORT
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cmn_t* cmn_init(int32 veclen);
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/**
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* CMN for the whole sentence
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*/
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SPHINXBASE_EXPORT
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void cmn (cmn_t *cmn, /**< In/Out: cmn normalization, which contains the cmn_mean and cmn_var) */
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mfcc_t **mfc, /**< In/Out: mfc[f] = mfc vector in frame f */
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int32 varnorm,/**< In: if not FALSE, variance normalize the input vectors
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to have unit variance (along each dimension independently);
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Irrelevant if no cmn is performed */
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int32 n_frame /**< In: Number of frames of mfc vectors */
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);
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#define CMN_WIN_HWM 800 /* #frames after which window shifted */
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#define CMN_WIN 500
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/**
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* CMN for one block of data, using prior mean
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*/
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SPHINXBASE_EXPORT
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void cmn_prior(cmn_t *cmn, /**< In/Out: cmn normalization, which contains
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the cmn_mean and cmn_var) */
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mfcc_t **incep, /**< In/Out: mfc[f] = mfc vector in frame f*/
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int32 varnorm, /**< This flag should always be 0 for live */
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int32 nfr /**< Number of incoming frames */
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);
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/**
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* Update prior mean based on observed data
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*/
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SPHINXBASE_EXPORT
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void cmn_prior_update(cmn_t *cmn);
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/**
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* Set the prior mean.
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*/
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SPHINXBASE_EXPORT
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void cmn_prior_set(cmn_t *cmn, mfcc_t const *vec);
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/**
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* Get the prior mean.
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*/
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SPHINXBASE_EXPORT
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void cmn_prior_get(cmn_t *cmn, mfcc_t *vec);
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/* RAH, free previously allocated memory */
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SPHINXBASE_EXPORT
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void cmn_free (cmn_t *cmn);
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#ifdef __cplusplus
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}
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#endif
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#endif
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