203 lines
6.0 KiB
C
203 lines
6.0 KiB
C
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/* -*- 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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* agc.h -- Various forms of automatic gain control (AGC)
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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 1.8 2005/06/21 19:25:41 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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* 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_AGC_H_
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#define _S3_AGC_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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/** \file agc.h
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* \brief routine that implements automatic gain control
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*
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* \warning This function may not be fully compatible with
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* SphinxTrain's family of AGC.
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*
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* This implements AGC.
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*/
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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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/**
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* Types of acoustic gain control to apply to the features.
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*/
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typedef enum agc_type_e {
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AGC_NONE = 0,
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AGC_MAX,
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AGC_EMAX,
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AGC_NOISE
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} agc_type_t;
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/** Convert string representation (from command-line) to agc_type_t */
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SPHINXBASE_EXPORT
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agc_type_t agc_type_from_str(const char *str);
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/** String representations of agc_type_t values. */
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SPHINXBASE_EXPORT
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extern const char *agc_type_str[];
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/**
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* Structure holding data for doing AGC.
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**/
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typedef struct agc_s {
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mfcc_t max; /**< Estimated max for current utterance (for AGC_EMAX) */
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mfcc_t obs_max; /**< Observed max in current utterance */
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int32 obs_frame; /**< Whether any data was observed after prev update */
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int32 obs_utt; /**< Whether any utterances have been observed */
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mfcc_t obs_max_sum;
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mfcc_t noise_thresh; /**< Noise threshold (for AGC_NOISE only) */
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} agc_t;
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/**
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* Initialize AGC structure with default values.
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*/
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SPHINXBASE_EXPORT
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agc_t *agc_init(void);
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/**
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* Free AGC structure.
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*/
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SPHINXBASE_EXPORT
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void agc_free(agc_t *agc);
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/**
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* Apply AGC to the given mfc vectors (normalize all C0 mfc coefficients in the given
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* input such that the max C0 value is 0, by subtracting the input max C0 from all).
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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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SPHINXBASE_EXPORT
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void agc_max(agc_t *agc, /**< In: AGC structure (not used) */
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mfcc_t **mfc, /**< In/Out: mfc[f] = cepstrum vector in frame f */
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int32 n_frame /**< In: number of frames of cepstrum vectors supplied */
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);
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/**
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* Apply AGC to the given block of MFC vectors.
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* Unlike agc_max() this does not require the entire utterance to be
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* available. Call agc_emax_update() at the end of each utterance to
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* update the AGC parameters. */
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SPHINXBASE_EXPORT
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void agc_emax(agc_t *agc, /**< In: AGC structure */
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mfcc_t **mfc, /**< In/Out: mfc[f] = cepstrum vector in frame f */
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int32 n_frame /**< In: number of frames of cepstrum vectors supplied */
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);
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/**
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* Update AGC parameters for next utterance.
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**/
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SPHINXBASE_EXPORT
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void agc_emax_update(agc_t *agc /**< In: AGC structure */
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);
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/**
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* Get the current AGC maximum estimate.
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**/
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SPHINXBASE_EXPORT
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float32 agc_emax_get(agc_t *agc);
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/**
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* Set the current AGC maximum estimate.
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**/
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SPHINXBASE_EXPORT
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void agc_emax_set(agc_t *agc, float32 m);
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/**
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* Apply AGC using noise threshold to the given block of MFC vectors.
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**/
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SPHINXBASE_EXPORT
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void agc_noise(agc_t *agc, /**< In: AGC structure */
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mfcc_t **mfc, /**< In/Out: mfc[f] = cepstrum vector in frame f */
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int32 n_frame /**< In: number of frames of cepstrum vectors supplied */
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);
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/**
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* Get the current AGC noise threshold.
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**/
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SPHINXBASE_EXPORT
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float32 agc_get_threshold(agc_t *agc);
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/**
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* Set the current AGC noise threshold.
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**/
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SPHINXBASE_EXPORT
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void agc_set_threshold(agc_t *agc, float32 threshold);
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#ifdef __cplusplus
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}
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#endif
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#endif
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