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/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* ====================================================================
* 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.
*
* 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
* NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ====================================================================
*
*/
/*
* cmn.h -- Various forms of cepstral mean normalization
*
* **********************************************
* CMU ARPA Speech Project
*
* Copyright (c) 1999 Carnegie Mellon University.
* ALL RIGHTS RESERVED.
* **********************************************
*
* HISTORY
* $Log$
* Revision 1.1 2006/04/05 20:27:30 dhdfu
* A Great Reorganzation of header files and executables
*
* Revision 1.13 2006/02/23 03:48:27 arthchan2003
* Resolved conflict in cmn.h
*
*
* Revision 1.12 2006/02/22 23:43:55 arthchan2003
* Merged from the branch SPHINX3_5_2_RCI_IRII_BRANCH: Put data structure into the cmn_t structure.
*
* Revision 1.11.4.2 2005/10/17 04:45:57 arthchan2003
* Free stuffs in cmn and feat corectly.
*
* Revision 1.11.4.1 2005/07/05 06:25:08 arthchan2003
* Fixed dox-doc.
*
* Revision 1.11 2005/06/21 19:28:00 arthchan2003
* 1, Fixed doxygen documentation. 2, Added $ keyword.
*
* Revision 1.4 2005/06/13 04:02:56 archan
* Fixed most doxygen-style documentation under libs3decoder.
*
* Revision 1.3 2005/03/30 01:22:46 archan
* Fixed mistakes in last updates. Add
*
*
* 20.Apr.2001 RAH (rhoughton@mediasite.com, ricky.houghton@cs.cmu.edu)
* Added cmn_free() and moved *mean and *var out global space and named them cmn_mean and cmn_var
*
* 28-Apr-1999 M K Ravishankar (rkm@cs.cmu.edu) at Carnegie Mellon University
* Copied from previous version.
*/
#ifndef _S3_CMN_H_
#define _S3_CMN_H_
/* Win32/WinCE DLL gunk */
#include <sphinxbase/sphinxbase_export.h>
#include <sphinxbase/prim_type.h>
#include <sphinxbase/fe.h>
#ifdef __cplusplus
extern "C" {
#endif
#if 0
/* Fool Emacs. */
}
#endif
/** \file cmn.h
* \brief Apply Cepstral Mean Normalization (CMN) to the set of input mfc frames.
*
* By subtractingthe mean of the input from each frame. C0 is also included in this process.
* This function operates on an entire utterance at a time. Hence, the entire utterance
* must be available beforehand (batchmode).
*/
/**
* Types of cepstral mean normalization to apply to the features.
*/
typedef enum cmn_type_e {
CMN_NONE = 0,
CMN_CURRENT,
CMN_PRIOR
} cmn_type_t;
/** String representations of cmn_type_t values. */
SPHINXBASE_EXPORT
extern const char *cmn_type_str[];
/** Convert string representation (from command-line) to cmn_type_t */
SPHINXBASE_EXPORT
cmn_type_t cmn_type_from_str(const char *str);
/** \struct cmn_t
* \brief wrapper of operation of the cepstral mean normalization.
*/
typedef struct {
mfcc_t *cmn_mean; /**< Temporary variable: current means */
mfcc_t *cmn_var; /**< Temporary variables: stored the cmn variance */
mfcc_t *sum; /**< The sum of the cmn frames */
int32 nframe; /**< Number of frames */
int32 veclen; /**< Length of cepstral vector */
} cmn_t;
SPHINXBASE_EXPORT
cmn_t* cmn_init(int32 veclen);
/**
* CMN for the whole sentence
*/
SPHINXBASE_EXPORT
void cmn (cmn_t *cmn, /**< In/Out: cmn normalization, which contains the cmn_mean and cmn_var) */
mfcc_t **mfc, /**< In/Out: mfc[f] = mfc vector in frame f */
int32 varnorm,/**< In: if not FALSE, variance normalize the input vectors
to have unit variance (along each dimension independently);
Irrelevant if no cmn is performed */
int32 n_frame /**< In: Number of frames of mfc vectors */
);
#define CMN_WIN_HWM 800 /* #frames after which window shifted */
#define CMN_WIN 500
/**
* CMN for one block of data, using prior mean
*/
SPHINXBASE_EXPORT
void cmn_prior(cmn_t *cmn, /**< In/Out: cmn normalization, which contains
the cmn_mean and cmn_var) */
mfcc_t **incep, /**< In/Out: mfc[f] = mfc vector in frame f*/
int32 varnorm, /**< This flag should always be 0 for live */
int32 nfr /**< Number of incoming frames */
);
/**
* Update prior mean based on observed data
*/
SPHINXBASE_EXPORT
void cmn_prior_update(cmn_t *cmn);
/**
* Set the prior mean.
*/
SPHINXBASE_EXPORT
void cmn_prior_set(cmn_t *cmn, mfcc_t const *vec);
/**
* Get the prior mean.
*/
SPHINXBASE_EXPORT
void cmn_prior_get(cmn_t *cmn, mfcc_t *vec);
/* RAH, free previously allocated memory */
SPHINXBASE_EXPORT
void cmn_free (cmn_t *cmn);
#ifdef __cplusplus
}
#endif
#endif
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