cmn_live.c
/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* ====================================================================
* Copyright (c) 1999-2004 Carnegie Mellon University. All rights
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* 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.
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#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"
void
cmn_live_set(cmn_t *cmn, mfcc_t const * vec)
{
int32 i;
E_INFO("Update from < ");
for (i = 0; i < cmn->veclen; i++)
E_INFOCONT("%5.2f ", MFCC2FLOAT(cmn->cmn_mean[i]));
E_INFOCONT(">\n");
for (i = 0; i < cmn->veclen; i++) {
cmn->cmn_mean[i] = vec[i];
cmn->sum[i] = vec[i] * CMN_WIN;
}
cmn->nframe = CMN_WIN;
E_INFO("Update to < ");
for (i = 0; i < cmn->veclen; i++)
E_INFOCONT("%5.2f ", MFCC2FLOAT(cmn->cmn_mean[i]));
E_INFOCONT(">\n");
}
void
cmn_live_get(cmn_t *cmn, mfcc_t * vec)
{
int32 i;
for (i = 0; i < cmn->veclen; i++)
vec[i] = cmn->cmn_mean[i];
}
static void
cmn_live_shiftwin(cmn_t *cmn)
{
mfcc_t sf;
int32 i;
E_INFO("Update from < ");
for (i = 0; i < cmn->veclen; i++)
E_INFOCONT("%5.2f ", MFCC2FLOAT(cmn->cmn_mean[i]));
E_INFOCONT(">\n");
sf = FLOAT2MFCC(1.0) / cmn->nframe;
for (i = 0; i < cmn->veclen; i++)
cmn->cmn_mean[i] = cmn->sum[i] / cmn->nframe; /* sum[i] * sf */
/* Make the accumulation decay exponentially */
if (cmn->nframe >= CMN_WIN_HWM) {
sf = CMN_WIN * sf;
for (i = 0; i < cmn->veclen; i++)
cmn->sum[i] = MFCCMUL(cmn->sum[i], sf);
cmn->nframe = CMN_WIN;
}
E_INFO("Update to < ");
for (i = 0; i < cmn->veclen; i++)
E_INFOCONT("%5.2f ", MFCC2FLOAT(cmn->cmn_mean[i]));
E_INFOCONT(">\n");
}
void
cmn_live_update(cmn_t *cmn)
{
mfcc_t sf;
int32 i;
if (cmn->nframe <= 0)
return;
E_INFO("Update from < ");
for (i = 0; i < cmn->veclen; i++)
E_INFOCONT("%5.2f ", MFCC2FLOAT(cmn->cmn_mean[i]));
E_INFOCONT(">\n");
/* Update mean buffer */
sf = FLOAT2MFCC(1.0) / cmn->nframe;
for (i = 0; i < cmn->veclen; i++)
cmn->cmn_mean[i] = cmn->sum[i] / cmn->nframe; /* sum[i] * sf; */
/* Make the accumulation decay exponentially */
if (cmn->nframe > CMN_WIN_HWM) {
sf = CMN_WIN * sf;
for (i = 0; i < cmn->veclen; i++)
cmn->sum[i] = MFCCMUL(cmn->sum[i], sf);
cmn->nframe = CMN_WIN;
}
E_INFO("Update to < ");
for (i = 0; i < cmn->veclen; i++)
E_INFOCONT("%5.2f ", MFCC2FLOAT(cmn->cmn_mean[i]));
E_INFOCONT(">\n");
}
void
cmn_live(cmn_t *cmn, mfcc_t **incep, int32 varnorm, int32 nfr)
{
int32 i, j;
if (nfr <= 0)
return;
if (varnorm)
E_FATAL
("Variance normalization not implemented in live mode decode\n");
for (i = 0; i < nfr; i++) {
/* Skip zero energy frames */
if (incep[i][0] < 0)
continue;
for (j = 0; j < cmn->veclen; j++) {
cmn->sum[j] += incep[i][j];
incep[i][j] -= cmn->cmn_mean[j];
}
++cmn->nframe;
}
/* Shift buffer down if we have more than CMN_WIN_HWM frames */
if (cmn->nframe > CMN_WIN_HWM)
cmn_live_shiftwin(cmn);
}
ckd_alloc.h
Sphinx's memory allocation/deallocation routines.
cmn.h
Apply Cepstral Mean Normalization (CMN) to the set of input mfc frames.
cmn_live_get
SPHINXBASE_EXPORT void cmn_live_get(cmn_t *cmn, mfcc_t *vec)
Get the live mean.
Definition cmn_live.c:73
cmn_live
SPHINXBASE_EXPORT void cmn_live(cmn_t *cmn, mfcc_t **incep, int32 varnorm, int32 nfr)
CMN for one block of data, using live mean.
Definition cmn_live.c:145
cmn
SPHINXBASE_EXPORT void cmn(cmn_t *cmn, mfcc_t **mfc, int32 varnorm, int32 n_frame)
CMN for the whole sentence.
Definition cmn.c:100
cmn_live_update
SPHINXBASE_EXPORT void cmn_live_update(cmn_t *cmn)
Update live mean based on observed data.
Definition cmn_live.c:112
cmn_live_set
SPHINXBASE_EXPORT void cmn_live_set(cmn_t *cmn, mfcc_t const *vec)
Set the live mean.
Definition cmn_live.c:51
err.h
Implementation of logging routines.
E_INFO
#define E_INFO(...)
Print logging information to standard error stream.
Definition err.h:114
E_INFOCONT
#define E_INFOCONT(...)
Continue printing the information to standard error stream.
Definition err.h:119
E_FATAL
#define E_FATAL(...)
Exit with non-zero status after error message.
Definition err.h:81
cmn_t
wrapper of operation of the cepstral mean normalization.
Definition cmn.h:128