525 lines
21 KiB
C
525 lines
21 KiB
C
/* ----------------------------------------------------------------- */
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/* The HMM-Based Speech Synthesis Engine "hts_engine API" */
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/* developed by HTS Working Group */
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/* http://hts-engine.sourceforge.net/ */
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/* ----------------------------------------------------------------- */
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/* */
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/* Copyright (c) 2001-2015 Nagoya Institute of Technology */
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/* Department of Computer Science */
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/* */
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/* 2001-2008 Tokyo Institute of Technology */
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/* Interdisciplinary Graduate School of */
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/* Science and Engineering */
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/* */
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/* All rights reserved. */
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/* */
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/* Redistribution and use in source and binary forms, with or */
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/* without modification, are permitted provided that the following */
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/* conditions are met: */
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/* */
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/* - 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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/* - Redistributions in binary form must reproduce the above */
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/* copyright notice, this list of conditions and the following */
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/* disclaimer in the documentation and/or other materials provided */
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/* with the distribution. */
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/* - Neither the name of the HTS working group nor the names of its */
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/* contributors may be used to endorse or promote products derived */
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/* from this software without specific prior written permission. */
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/* */
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/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND */
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/* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, */
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/* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */
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/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */
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/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS */
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/* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, */
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/* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED */
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/* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, */
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/* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON */
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/* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, */
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/* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY */
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/* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE */
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/* POSSIBILITY OF SUCH DAMAGE. */
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/* ----------------------------------------------------------------- */
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#ifndef HTS_PSTREAM_C
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#define HTS_PSTREAM_C
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#ifdef __cplusplus
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#define HTS_PSTREAM_C_START extern "C" {
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#define HTS_PSTREAM_C_END }
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#else
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#define HTS_PSTREAM_C_START
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#define HTS_PSTREAM_C_END
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#endif /* __CPLUSPLUS */
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HTS_PSTREAM_C_START;
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#include <math.h> /* for sqrt() */
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/* hts_engine libraries */
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#include "HTS_hidden.h"
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/* HTS_finv: calculate 1.0/variance function */
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static double HTS_finv(const double x)
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{
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if (x >= INFTY2)
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return 0.0;
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if (x <= -INFTY2)
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return 0.0;
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if (x <= INVINF2 && x >= 0)
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return INFTY;
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if (x >= -INVINF2 && x < 0)
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return -INFTY;
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return (1.0 / x);
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}
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/* HTS_PStream_calc_wuw_and_wum: calcurate W'U^{-1}W and W'U^{-1}M */
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static void HTS_PStream_calc_wuw_and_wum(HTS_PStream * pst, size_t m)
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{
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size_t t, i, j;
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int shift;
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double wu;
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for (t = 0; t < pst->length; t++) {
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/* initialize */
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pst->sm.wum[t] = 0.0;
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for (i = 0; i < pst->width; i++)
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pst->sm.wuw[t][i] = 0.0;
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/* calc WUW & WUM */
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for (i = 0; i < pst->win_size; i++)
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for (shift = pst->win_l_width[i]; shift <= pst->win_r_width[i]; shift++)
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if (((int) t + shift >= 0) && ((int) t + shift < pst->length) && (pst->win_coefficient[i][-shift] != 0.0)) {
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wu = pst->win_coefficient[i][-shift] * pst->sm.ivar[t + shift][i * pst->vector_length + m];
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pst->sm.wum[t] += wu * pst->sm.mean[t + shift][i * pst->vector_length + m];
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for (j = 0; (j < pst->width) && (t + j < pst->length); j++)
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if (((int) j <= pst->win_r_width[i] + shift) && (pst->win_coefficient[i][j - shift] != 0.0))
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pst->sm.wuw[t][j] += wu * pst->win_coefficient[i][j - shift];
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}
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}
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}
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/* HTS_PStream_ldl_factorization: Factorize W'*U^{-1}*W to L*D*L' (L: lower triangular, D: diagonal) */
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static void HTS_PStream_ldl_factorization(HTS_PStream * pst)
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{
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size_t t, i, j;
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for (t = 0; t < pst->length; t++) {
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for (i = 1; (i < pst->width) && (t >= i); i++)
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pst->sm.wuw[t][0] -= pst->sm.wuw[t - i][i] * pst->sm.wuw[t - i][i] * pst->sm.wuw[t - i][0];
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for (i = 1; i < pst->width; i++) {
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for (j = 1; (i + j < pst->width) && (t >= j); j++)
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pst->sm.wuw[t][i] -= pst->sm.wuw[t - j][j] * pst->sm.wuw[t - j][i + j] * pst->sm.wuw[t - j][0];
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pst->sm.wuw[t][i] /= pst->sm.wuw[t][0];
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}
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}
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}
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/* HTS_PStream_forward_substitution: forward subtitution for mlpg */
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static void HTS_PStream_forward_substitution(HTS_PStream * pst)
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{
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size_t t, i;
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for (t = 0; t < pst->length; t++) {
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pst->sm.g[t] = pst->sm.wum[t];
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for (i = 1; (i < pst->width) && (t >= i); i++)
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pst->sm.g[t] -= pst->sm.wuw[t - i][i] * pst->sm.g[t - i];
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}
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}
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/* HTS_PStream_backward_substitution: backward subtitution for mlpg */
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static void HTS_PStream_backward_substitution(HTS_PStream * pst, size_t m)
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{
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size_t rev, t, i;
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for (rev = 0; rev < pst->length; rev++) {
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t = pst->length - 1 - rev;
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pst->par[t][m] = pst->sm.g[t] / pst->sm.wuw[t][0];
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for (i = 1; (i < pst->width) && (t + i < pst->length); i++)
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pst->par[t][m] -= pst->sm.wuw[t][i] * pst->par[t + i][m];
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}
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}
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/* HTS_PStream_calc_gv: subfunction for mlpg using GV */
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static void HTS_PStream_calc_gv(HTS_PStream * pst, size_t m, double *mean, double *vari)
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{
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size_t t;
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*mean = 0.0;
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for (t = 0; t < pst->length; t++)
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if (pst->gv_switch[t])
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*mean += pst->par[t][m];
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*mean /= pst->gv_length;
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*vari = 0.0;
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for (t = 0; t < pst->length; t++)
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if (pst->gv_switch[t])
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*vari += (pst->par[t][m] - *mean) * (pst->par[t][m] - *mean);
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*vari /= pst->gv_length;
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}
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/* HTS_PStream_conv_gv: subfunction for mlpg using GV */
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static void HTS_PStream_conv_gv(HTS_PStream * pst, size_t m)
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{
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size_t t;
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double ratio;
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double mean;
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double vari;
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HTS_PStream_calc_gv(pst, m, &mean, &vari);
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ratio = sqrt(pst->gv_mean[m] / vari);
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for (t = 0; t < pst->length; t++)
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if (pst->gv_switch[t])
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pst->par[t][m] = ratio * (pst->par[t][m] - mean) + mean;
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}
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/* HTS_PStream_calc_derivative: subfunction for mlpg using GV */
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static double HTS_PStream_calc_derivative(HTS_PStream * pst, size_t m)
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{
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size_t t, i;
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double mean;
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double vari;
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double dv;
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double h;
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double gvobj;
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double hmmobj;
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double w = 1.0 / (pst->win_size * pst->length);
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HTS_PStream_calc_gv(pst, m, &mean, &vari);
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gvobj = -0.5 * W2 * vari * pst->gv_vari[m] * (vari - 2.0 * pst->gv_mean[m]);
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dv = -2.0 * pst->gv_vari[m] * (vari - pst->gv_mean[m]) / pst->length;
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for (t = 0; t < pst->length; t++) {
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pst->sm.g[t] = pst->sm.wuw[t][0] * pst->par[t][m];
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for (i = 1; i < pst->width; i++) {
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if (t + i < pst->length)
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pst->sm.g[t] += pst->sm.wuw[t][i] * pst->par[t + i][m];
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if (t + 1 > i)
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pst->sm.g[t] += pst->sm.wuw[t - i][i] * pst->par[t - i][m];
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}
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}
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for (t = 0, hmmobj = 0.0; t < pst->length; t++) {
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hmmobj += W1 * w * pst->par[t][m] * (pst->sm.wum[t] - 0.5 * pst->sm.g[t]);
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h = -W1 * w * pst->sm.wuw[t][1 - 1] - W2 * 2.0 / (pst->length * pst->length) * ((pst->length - 1) * pst->gv_vari[m] * (vari - pst->gv_mean[m]) + 2.0 * pst->gv_vari[m] * (pst->par[t][m] - mean) * (pst->par[t][m] - mean));
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if (pst->gv_switch[t])
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pst->sm.g[t] = 1.0 / h * (W1 * w * (-pst->sm.g[t] + pst->sm.wum[t]) + W2 * dv * (pst->par[t][m] - mean));
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else
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pst->sm.g[t] = 1.0 / h * (W1 * w * (-pst->sm.g[t] + pst->sm.wum[t]));
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}
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return (-(hmmobj + gvobj));
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}
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/* HTS_PStream_gv_parmgen: function for mlpg using GV */
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static void HTS_PStream_gv_parmgen(HTS_PStream * pst, size_t m)
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{
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size_t t, i;
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double step = STEPINIT;
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double prev = 0.0;
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double obj;
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if (pst->gv_length == 0)
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return;
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HTS_PStream_conv_gv(pst, m);
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if (GV_MAX_ITERATION > 0) {
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HTS_PStream_calc_wuw_and_wum(pst, m);
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for (i = 1; i <= GV_MAX_ITERATION; i++) {
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obj = HTS_PStream_calc_derivative(pst, m);
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if (i > 1) {
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if (obj > prev)
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step *= STEPDEC;
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if (obj < prev)
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step *= STEPINC;
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}
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for (t = 0; t < pst->length; t++) {
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if (pst->gv_switch[t])
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pst->par[t][m] += step * pst->sm.g[t];
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}
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prev = obj;
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}
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}
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}
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/* HTS_PStream_mlpg: generate sequence of speech parameter vector maximizing its output probability for given pdf sequence */
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static void HTS_PStream_mlpg(HTS_PStream * pst)
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{
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size_t m;
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if (pst->length == 0)
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return;
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for (m = 0; m < pst->vector_length; m++) {
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HTS_PStream_calc_wuw_and_wum(pst, m);
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HTS_PStream_ldl_factorization(pst); /* LDL factorization */
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HTS_PStream_forward_substitution(pst); /* forward substitution */
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HTS_PStream_backward_substitution(pst, m); /* backward substitution */
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if (pst->gv_length > 0)
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HTS_PStream_gv_parmgen(pst, m);
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}
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}
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/* HTS_PStreamSet_initialize: initialize parameter stream set */
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void HTS_PStreamSet_initialize(HTS_PStreamSet * pss)
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{
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pss->pstream = NULL;
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pss->nstream = 0;
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pss->total_frame = 0;
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}
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/* HTS_PStreamSet_create: parameter generation using GV weight */
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HTS_Boolean HTS_PStreamSet_create(HTS_PStreamSet * pss, HTS_SStreamSet * sss, double *msd_threshold, double *gv_weight)
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{
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size_t i, j, k, l, m;
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int shift;
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size_t frame, msd_frame, state;
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HTS_PStream *pst;
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HTS_Boolean not_bound;
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if (pss->nstream != 0) {
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HTS_error(1, "HTS_PstreamSet_create: HTS_PStreamSet should be clear.\n");
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return FALSE;
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}
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/* initialize */
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pss->nstream = HTS_SStreamSet_get_nstream(sss);
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pss->pstream = (HTS_PStream *) HTS_calloc(pss->nstream, sizeof(HTS_PStream));
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pss->total_frame = HTS_SStreamSet_get_total_frame(sss);
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/* create */
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for (i = 0; i < pss->nstream; i++) {
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pst = &pss->pstream[i];
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if (HTS_SStreamSet_is_msd(sss, i) == TRUE) { /* for MSD */
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pst->length = 0;
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for (state = 0; state < HTS_SStreamSet_get_total_state(sss); state++)
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if (HTS_SStreamSet_get_msd(sss, i, state) > msd_threshold[i])
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pst->length += HTS_SStreamSet_get_duration(sss, state);
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pst->msd_flag = (HTS_Boolean *) HTS_calloc(pss->total_frame, sizeof(HTS_Boolean));
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for (state = 0, frame = 0; state < HTS_SStreamSet_get_total_state(sss); state++) {
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if (HTS_SStreamSet_get_msd(sss, i, state) > msd_threshold[i]) {
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for (j = 0; j < HTS_SStreamSet_get_duration(sss, state); j++) {
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pst->msd_flag[frame] = TRUE;
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frame++;
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}
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} else {
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for (j = 0; j < HTS_SStreamSet_get_duration(sss, state); j++) {
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pst->msd_flag[frame] = FALSE;
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frame++;
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}
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}
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}
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} else { /* for non MSD */
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pst->length = pss->total_frame;
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pst->msd_flag = NULL;
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}
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pst->vector_length = HTS_SStreamSet_get_vector_length(sss, i);
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pst->width = HTS_SStreamSet_get_window_max_width(sss, i) * 2 + 1; /* band width of R */
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pst->win_size = HTS_SStreamSet_get_window_size(sss, i);
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if (pst->length > 0) {
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pst->sm.mean = HTS_alloc_matrix(pst->length, pst->vector_length * pst->win_size);
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pst->sm.ivar = HTS_alloc_matrix(pst->length, pst->vector_length * pst->win_size);
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pst->sm.wum = (double *) HTS_calloc(pst->length, sizeof(double));
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pst->sm.wuw = HTS_alloc_matrix(pst->length, pst->width);
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pst->sm.g = (double *) HTS_calloc(pst->length, sizeof(double));
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pst->par = HTS_alloc_matrix(pst->length, pst->vector_length);
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}
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/* copy dynamic window */
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pst->win_l_width = (int *) HTS_calloc(pst->win_size, sizeof(int));
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pst->win_r_width = (int *) HTS_calloc(pst->win_size, sizeof(int));
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pst->win_coefficient = (double **) HTS_calloc(pst->win_size, sizeof(double));
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for (j = 0; j < pst->win_size; j++) {
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pst->win_l_width[j] = HTS_SStreamSet_get_window_left_width(sss, i, j);
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pst->win_r_width[j] = HTS_SStreamSet_get_window_right_width(sss, i, j);
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if (pst->win_l_width[j] + pst->win_r_width[j] == 0)
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pst->win_coefficient[j] = (double *)
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HTS_calloc(-2 * pst->win_l_width[j] + 1, sizeof(double));
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else
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pst->win_coefficient[j] = (double *)
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HTS_calloc(-2 * pst->win_l_width[j], sizeof(double));
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pst->win_coefficient[j] -= pst->win_l_width[j];
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for (shift = pst->win_l_width[j]; shift <= pst->win_r_width[j]; shift++)
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pst->win_coefficient[j][shift] = HTS_SStreamSet_get_window_coefficient(sss, i, j, shift);
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}
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/* copy GV */
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if (HTS_SStreamSet_use_gv(sss, i)) {
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pst->gv_mean = (double *) HTS_calloc(pst->vector_length, sizeof(double));
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pst->gv_vari = (double *) HTS_calloc(pst->vector_length, sizeof(double));
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for (j = 0; j < pst->vector_length; j++) {
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pst->gv_mean[j] = HTS_SStreamSet_get_gv_mean(sss, i, j) * gv_weight[i];
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pst->gv_vari[j] = HTS_SStreamSet_get_gv_vari(sss, i, j);
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}
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pst->gv_switch = (HTS_Boolean *) HTS_calloc(pst->length, sizeof(HTS_Boolean));
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if (HTS_SStreamSet_is_msd(sss, i) == TRUE) { /* for MSD */
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for (state = 0, frame = 0, msd_frame = 0; state < HTS_SStreamSet_get_total_state(sss); state++)
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for (j = 0; j < HTS_SStreamSet_get_duration(sss, state); j++, frame++)
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if (pst->msd_flag[frame] == TRUE)
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pst->gv_switch[msd_frame++] = HTS_SStreamSet_get_gv_switch(sss, i, state);
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} else { /* for non MSD */
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for (state = 0, frame = 0; state < HTS_SStreamSet_get_total_state(sss); state++)
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for (j = 0; j < HTS_SStreamSet_get_duration(sss, state); j++)
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pst->gv_switch[frame++] = HTS_SStreamSet_get_gv_switch(sss, i, state);
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}
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for (j = 0, pst->gv_length = 0; j < pst->length; j++)
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if (pst->gv_switch[j])
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pst->gv_length++;
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} else {
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pst->gv_switch = NULL;
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pst->gv_length = 0;
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pst->gv_mean = NULL;
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pst->gv_vari = NULL;
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}
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/* copy pdfs */
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if (HTS_SStreamSet_is_msd(sss, i) == TRUE) { /* for MSD */
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for (state = 0, frame = 0, msd_frame = 0; state < HTS_SStreamSet_get_total_state(sss); state++) {
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for (j = 0; j < HTS_SStreamSet_get_duration(sss, state); j++) {
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if (pst->msd_flag[frame] == TRUE) {
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/* check current frame is MSD boundary or not */
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for (k = 0; k < pst->win_size; k++) {
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not_bound = TRUE;
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for (shift = pst->win_l_width[k]; shift <= pst->win_r_width[k]; shift++)
|
|
if ((int) frame + shift < 0 || (int) pss->total_frame <= (int) frame + shift || pst->msd_flag[frame + shift] != TRUE) {
|
|
not_bound = FALSE;
|
|
break;
|
|
}
|
|
for (l = 0; l < pst->vector_length; l++) {
|
|
m = pst->vector_length * k + l;
|
|
pst->sm.mean[msd_frame][m] = HTS_SStreamSet_get_mean(sss, i, state, m);
|
|
if (not_bound || k == 0)
|
|
pst->sm.ivar[msd_frame][m] = HTS_finv(HTS_SStreamSet_get_vari(sss, i, state, m));
|
|
else
|
|
pst->sm.ivar[msd_frame][m] = 0.0;
|
|
}
|
|
}
|
|
msd_frame++;
|
|
}
|
|
frame++;
|
|
}
|
|
}
|
|
} else { /* for non MSD */
|
|
for (state = 0, frame = 0; state < HTS_SStreamSet_get_total_state(sss); state++) {
|
|
for (j = 0; j < HTS_SStreamSet_get_duration(sss, state); j++) {
|
|
for (k = 0; k < pst->win_size; k++) {
|
|
not_bound = TRUE;
|
|
for (shift = pst->win_l_width[k]; shift <= pst->win_r_width[k]; shift++)
|
|
if ((int) frame + shift < 0 || (int) pss->total_frame <= (int) frame + shift) {
|
|
not_bound = FALSE;
|
|
break;
|
|
}
|
|
for (l = 0; l < pst->vector_length; l++) {
|
|
m = pst->vector_length * k + l;
|
|
pst->sm.mean[frame][m] = HTS_SStreamSet_get_mean(sss, i, state, m);
|
|
if (not_bound || k == 0)
|
|
pst->sm.ivar[frame][m] = HTS_finv(HTS_SStreamSet_get_vari(sss, i, state, m));
|
|
else
|
|
pst->sm.ivar[frame][m] = 0.0;
|
|
}
|
|
}
|
|
frame++;
|
|
}
|
|
}
|
|
}
|
|
/* parameter generation */
|
|
HTS_PStream_mlpg(pst);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* HTS_PStreamSet_get_nstream: get number of stream */
|
|
size_t HTS_PStreamSet_get_nstream(HTS_PStreamSet * pss)
|
|
{
|
|
return pss->nstream;
|
|
}
|
|
|
|
/* HTS_PStreamSet_get_vector_length: get feature length */
|
|
size_t HTS_PStreamSet_get_vector_length(HTS_PStreamSet * pss, size_t stream_index)
|
|
{
|
|
return pss->pstream[stream_index].vector_length;
|
|
}
|
|
|
|
/* HTS_PStreamSet_get_total_frame: get total number of frame */
|
|
size_t HTS_PStreamSet_get_total_frame(HTS_PStreamSet * pss)
|
|
{
|
|
return pss->total_frame;
|
|
}
|
|
|
|
/* HTS_PStreamSet_get_parameter: get parameter */
|
|
double HTS_PStreamSet_get_parameter(HTS_PStreamSet * pss, size_t stream_index, size_t frame_index, size_t vector_index)
|
|
{
|
|
return pss->pstream[stream_index].par[frame_index][vector_index];
|
|
}
|
|
|
|
/* HTS_PStreamSet_get_parameter_vector: get parameter vector*/
|
|
double *HTS_PStreamSet_get_parameter_vector(HTS_PStreamSet * pss, size_t stream_index, size_t frame_index)
|
|
{
|
|
return pss->pstream[stream_index].par[frame_index];
|
|
}
|
|
|
|
/* HTS_PStreamSet_get_msd_flag: get generated MSD flag per frame */
|
|
HTS_Boolean HTS_PStreamSet_get_msd_flag(HTS_PStreamSet * pss, size_t stream_index, size_t frame_index)
|
|
{
|
|
return pss->pstream[stream_index].msd_flag[frame_index];
|
|
}
|
|
|
|
/* HTS_PStreamSet_is_msd: get MSD flag */
|
|
HTS_Boolean HTS_PStreamSet_is_msd(HTS_PStreamSet * pss, size_t stream_index)
|
|
{
|
|
return pss->pstream[stream_index].msd_flag ? TRUE : FALSE;
|
|
}
|
|
|
|
/* HTS_PStreamSet_clear: free parameter stream set */
|
|
void HTS_PStreamSet_clear(HTS_PStreamSet * pss)
|
|
{
|
|
size_t i, j;
|
|
HTS_PStream *pstream;
|
|
|
|
if (pss->pstream) {
|
|
for (i = 0; i < pss->nstream; i++) {
|
|
pstream = &pss->pstream[i];
|
|
if (pstream->sm.wum)
|
|
HTS_free(pstream->sm.wum);
|
|
if (pstream->sm.g)
|
|
HTS_free(pstream->sm.g);
|
|
if (pstream->sm.wuw)
|
|
HTS_free_matrix(pstream->sm.wuw, pstream->length);
|
|
if (pstream->sm.ivar)
|
|
HTS_free_matrix(pstream->sm.ivar, pstream->length);
|
|
if (pstream->sm.mean)
|
|
HTS_free_matrix(pstream->sm.mean, pstream->length);
|
|
if (pstream->par)
|
|
HTS_free_matrix(pstream->par, pstream->length);
|
|
if (pstream->msd_flag)
|
|
HTS_free(pstream->msd_flag);
|
|
if (pstream->win_coefficient) {
|
|
for (j = 0; j < pstream->win_size; j++) {
|
|
pstream->win_coefficient[j] += pstream->win_l_width[j];
|
|
HTS_free(pstream->win_coefficient[j]);
|
|
}
|
|
}
|
|
if (pstream->gv_mean)
|
|
HTS_free(pstream->gv_mean);
|
|
if (pstream->gv_vari)
|
|
HTS_free(pstream->gv_vari);
|
|
if (pstream->win_coefficient)
|
|
HTS_free(pstream->win_coefficient);
|
|
if (pstream->win_l_width)
|
|
HTS_free(pstream->win_l_width);
|
|
if (pstream->win_r_width)
|
|
HTS_free(pstream->win_r_width);
|
|
if (pstream->gv_switch)
|
|
HTS_free(pstream->gv_switch);
|
|
}
|
|
HTS_free(pss->pstream);
|
|
}
|
|
HTS_PStreamSet_initialize(pss);
|
|
}
|
|
|
|
HTS_PSTREAM_C_END;
|
|
|
|
#endif /* !HTS_PSTREAM_C */
|