| /* -*- 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. | |
| * | |
| * ==================================================================== | |
| * | |
| */ | |
| void | |
| cmn_live_set(cmn_t *cmn, mfcc_t const * vec) | |
| { | |
| int32 i; | |
| E_INFO("Update from < %s >\n", cmn->repr); | |
| 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 < %s >\n", cmn_update_repr(cmn)); | |
| } | |
| static void | |
| cmn_live_shiftwin(cmn_t *cmn) | |
| { | |
| mfcc_t sf; | |
| int32 i; | |
| E_INFO("Update from < %s >\n", cmn->repr); | |
| 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 < %s >\n", cmn_update_repr(cmn)); | |
| } | |
| void | |
| cmn_live_update(cmn_t *cmn) | |
| { | |
| mfcc_t sf; | |
| int32 i; | |
| if (cmn->nframe <= 0) | |
| return; | |
| E_INFO("Update from < %s >\n", cmn->repr); | |
| /* 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 < %s >\n", cmn_update_repr(cmn)); | |
| } | |
| 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); | |
| } | |