cmn_live.c

/* -*- 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
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 * 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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#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);
}