/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* ====================================================================
* Copyright (c) 1999-2004 Carnegie Mellon University. All rights
* reserved.
*
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* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
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*
* 2. Redistributions in binary form must reproduce the above copyright
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* 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
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/*
* cmn.c -- Various forms of cepstral mean normalization
*
* **********************************************
* CMU ARPA Speech Project
*
* Copyright (c) 1996 Carnegie Mellon University.
* ALL RIGHTS RESERVED.
* **********************************************
*
* HISTORY
* $Log$
* Revision 1.14 2006/02/24 15:57:47 egouvea
* Removed cmn = NULL from the cmn_free(), since it's pointless (my bad!).
*
* Removed cmn_prior, which was surrounded by #if 0/#endif, since the
* function is already in cmn_prior.c
*
* Revision 1.13 2006/02/23 03:47:49 arthchan2003
* Used Evandro's changes. Resolved conflicts.
*
*
* Revision 1.12 2006/02/23 00:48:23 egouvea
* Replaced loops resetting vectors with the more efficient memset()
*
* Revision 1.11 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 1.10.4.2 2005/10/17 04:45:57 arthchan2003
* Free stuffs in cmn and feat corectly.
*
* Revision 1.10.4.1 2005/07/05 06:25:08 arthchan2003
* Fixed dox-doc.
*
* Revision 1.10 2005/06/21 19:28:00 arthchan2003
* 1, Fixed doxygen documentation. 2, Added $ keyword.
*
* 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
* Changed the name norm_mean() to cmn().
*
* 19-Jun-1996 M K Ravishankar (rkm@cs.cmu.edu) at Carnegie Mellon University
* Changed to compute CMN over ALL dimensions of cep instead of 1..12.
*
* 04-Nov-1995 M K Ravishankar (rkm@cs.cmu.edu) at Carnegie Mellon University
* Created.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <math.h>
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef _MSC_VER
#pragma warning (disable: 4244)
#endif
#include "sphinxbase/ckd_alloc.h"
#include "sphinxbase/err.h"
#include "sphinxbase/cmn.h"
/* NOTE! These must match the enum in cmn.h */
const char *cmn_type_str[] = {
"none",
"current",
"prior"
};
static const int n_cmn_type_str = sizeof(cmn_type_str)/sizeof(cmn_type_str[0]);
cmn_type_t
cmn_type_from_str(const char *str)
{
int i;
for (i = 0; i < n_cmn_type_str; ++i) {
if (0 == strcmp(str, cmn_type_str[i]))
return (cmn_type_t)i;
}
E_FATAL("Unknown CMN type '%s'\n", str);
return CMN_NONE;
}
cmn_t *
cmn_init(int32 veclen)
{
cmn_t *cmn;
cmn = (cmn_t *) ckd_calloc(1, sizeof(cmn_t));
cmn->veclen = veclen;
cmn->cmn_mean = (mfcc_t *) ckd_calloc(veclen, sizeof(mfcc_t));
cmn->cmn_var = (mfcc_t *) ckd_calloc(veclen, sizeof(mfcc_t));
cmn->sum = (mfcc_t *) ckd_calloc(veclen, sizeof(mfcc_t));
/* A front-end dependent magic number */
cmn->cmn_mean[0] = FLOAT2MFCC(12.0);
cmn->nframe = 0;
E_INFO("mean[0]= %.2f, mean[1..%d]= 0.0\n",
MFCC2FLOAT(cmn->cmn_mean[0]), veclen - 1);
return cmn;
}
void
cmn(cmn_t *cmn, mfcc_t ** mfc, int32 varnorm, int32 n_frame)
{
mfcc_t *mfcp;
mfcc_t t;
int32 i, f;
int32 n_pos_frame;
assert(mfc != NULL);
if (n_frame <= 0)
return;
/* If cmn->cmn_mean wasn't NULL, we need to zero the contents */
memset(cmn->cmn_mean, 0, cmn->veclen * sizeof(mfcc_t));
/* Find mean cep vector for this utterance */
for (f = 0, n_pos_frame = 0; f < n_frame; f++) {
mfcp = mfc[f];
/* Skip zero energy frames */
if (mfcp[0] < 0)
continue;
for (i = 0; i < cmn->veclen; i++) {
cmn->cmn_mean[i] += mfcp[i];
}
n_pos_frame++;
}
for (i = 0; i < cmn->veclen; i++)
cmn->cmn_mean[i] /= n_pos_frame;
E_INFO("CMN: ");
for (i = 0; i < cmn->veclen; i++)
E_INFOCONT("%5.2f ", MFCC2FLOAT(cmn->cmn_mean[i]));
E_INFOCONT("\n");
if (!varnorm) {
/* Subtract mean from each cep vector */
for (f = 0; f < n_frame; f++) {
mfcp = mfc[f];
for (i = 0; i < cmn->veclen; i++)
mfcp[i] -= cmn->cmn_mean[i];
}
}
else {
/* Scale cep vectors to have unit variance along each dimension, and subtract means */
/* If cmn->cmn_var wasn't NULL, we need to zero the contents */
memset(cmn->cmn_var, 0, cmn->veclen * sizeof(mfcc_t));
for (f = 0; f < n_frame; f++) {
mfcp = mfc[f];
for (i = 0; i < cmn->veclen; i++) {
t = mfcp[i] - cmn->cmn_mean[i];
cmn->cmn_var[i] += MFCCMUL(t, t);
}
}
for (i = 0; i < cmn->veclen; i++)
/* Inverse Std. Dev, RAH added type case from sqrt */
cmn->cmn_var[i] = FLOAT2MFCC(sqrt((float64)n_frame / MFCC2FLOAT(cmn->cmn_var[i])));
for (f = 0; f < n_frame; f++) {
mfcp = mfc[f];
for (i = 0; i < cmn->veclen; i++)
mfcp[i] = MFCCMUL((mfcp[i] - cmn->cmn_mean[i]), cmn->cmn_var[i]);
}
}
}
/*
* RAH, free previously allocated memory
*/
void
cmn_free(cmn_t * cmn)
{
if (cmn != NULL) {
if (cmn->cmn_var)
ckd_free((void *) cmn->cmn_var);
if (cmn->cmn_mean)
ckd_free((void *) cmn->cmn_mean);
if (cmn->sum)
ckd_free((void *) cmn->sum);
ckd_free((void *) cmn);
}
}