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<h1>src/libsphinxbase/feat/cmn.c</h1> </div>
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<div class="contents">
<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */</span>
<a name="l00002"></a>00002 <span class="comment">/* ====================================================================</span>
<a name="l00003"></a>00003 <span class="comment"> * Copyright (c) 1999-2004 Carnegie Mellon University. All rights</span>
<a name="l00004"></a>00004 <span class="comment"> * reserved.</span>
<a name="l00005"></a>00005 <span class="comment"> *</span>
<a name="l00006"></a>00006 <span class="comment"> * Redistribution and use in source and binary forms, with or without</span>
<a name="l00007"></a>00007 <span class="comment"> * modification, are permitted provided that the following conditions</span>
<a name="l00008"></a>00008 <span class="comment"> * are met:</span>
<a name="l00009"></a>00009 <span class="comment"> *</span>
<a name="l00010"></a>00010 <span class="comment"> * 1. Redistributions of source code must retain the above copyright</span>
<a name="l00011"></a>00011 <span class="comment"> * notice, this list of conditions and the following disclaimer. </span>
<a name="l00012"></a>00012 <span class="comment"> *</span>
<a name="l00013"></a>00013 <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright</span>
<a name="l00014"></a>00014 <span class="comment"> * notice, this list of conditions and the following disclaimer in</span>
<a name="l00015"></a>00015 <span class="comment"> * the documentation and/or other materials provided with the</span>
<a name="l00016"></a>00016 <span class="comment"> * distribution.</span>
<a name="l00017"></a>00017 <span class="comment"> *</span>
<a name="l00018"></a>00018 <span class="comment"> * This work was supported in part by funding from the Defense Advanced </span>
<a name="l00019"></a>00019 <span class="comment"> * Research Projects Agency and the National Science Foundation of the </span>
<a name="l00020"></a>00020 <span class="comment"> * United States of America, and the CMU Sphinx Speech Consortium.</span>
<a name="l00021"></a>00021 <span class="comment"> *</span>
<a name="l00022"></a>00022 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND </span>
<a name="l00023"></a>00023 <span class="comment"> * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, </span>
<a name="l00024"></a>00024 <span class="comment"> * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR</span>
<a name="l00025"></a>00025 <span class="comment"> * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY</span>
<a name="l00026"></a>00026 <span class="comment"> * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
<a name="l00027"></a>00027 <span class="comment"> * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT </span>
<a name="l00028"></a>00028 <span class="comment"> * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, </span>
<a name="l00029"></a>00029 <span class="comment"> * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY </span>
<a name="l00030"></a>00030 <span class="comment"> * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT </span>
<a name="l00031"></a>00031 <span class="comment"> * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE </span>
<a name="l00032"></a>00032 <span class="comment"> * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00033"></a>00033 <span class="comment"> *</span>
<a name="l00034"></a>00034 <span class="comment"> * ====================================================================</span>
<a name="l00035"></a>00035 <span class="comment"> *</span>
<a name="l00036"></a>00036 <span class="comment"> */</span>
<a name="l00037"></a>00037 <span class="comment">/*</span>
<a name="l00038"></a>00038 <span class="comment"> * cmn.c -- Various forms of cepstral mean normalization</span>
<a name="l00039"></a>00039 <span class="comment"> *</span>
<a name="l00040"></a>00040 <span class="comment"> * **********************************************</span>
<a name="l00041"></a>00041 <span class="comment"> * CMU ARPA Speech Project</span>
<a name="l00042"></a>00042 <span class="comment"> *</span>
<a name="l00043"></a>00043 <span class="comment"> * Copyright (c) 1996 Carnegie Mellon University.</span>
<a name="l00044"></a>00044 <span class="comment"> * ALL RIGHTS RESERVED.</span>
<a name="l00045"></a>00045 <span class="comment"> * **********************************************</span>
<a name="l00046"></a>00046 <span class="comment"> * </span>
<a name="l00047"></a>00047 <span class="comment"> * HISTORY</span>
<a name="l00048"></a>00048 <span class="comment"> * $Log$</span>
<a name="l00049"></a>00049 <span class="comment"> * Revision 1.14 2006/02/24 15:57:47 egouvea</span>
<a name="l00050"></a>00050 <span class="comment"> * Removed cmn = NULL from the cmn_free(), since it's pointless (my bad!).</span>
<a name="l00051"></a>00051 <span class="comment"> * </span>
<a name="l00052"></a>00052 <span class="comment"> * Removed cmn_prior, which was surrounded by #if 0/#endif, since the</span>
<a name="l00053"></a>00053 <span class="comment"> * function is already in cmn_prior.c</span>
<a name="l00054"></a>00054 <span class="comment"> * </span>
<a name="l00055"></a>00055 <span class="comment"> * Revision 1.13 2006/02/23 03:47:49 arthchan2003</span>
<a name="l00056"></a>00056 <span class="comment"> * Used Evandro's changes. Resolved conflicts.</span>
<a name="l00057"></a>00057 <span class="comment"> *</span>
<a name="l00058"></a>00058 <span class="comment"> *</span>
<a name="l00059"></a>00059 <span class="comment"> * Revision 1.12 2006/02/23 00:48:23 egouvea</span>
<a name="l00060"></a>00060 <span class="comment"> * Replaced loops resetting vectors with the more efficient memset()</span>
<a name="l00061"></a>00061 <span class="comment"> *</span>
<a name="l00062"></a>00062 <span class="comment"> * Revision 1.11 2006/02/22 23:43:55 arthchan2003</span>
<a name="l00063"></a>00063 <span class="comment"> * Merged from the branch SPHINX3_5_2_RCI_IRII_BRANCH: Put data structure into the cmn_t structure.</span>
<a name="l00064"></a>00064 <span class="comment"> *</span>
<a name="l00065"></a>00065 <span class="comment"> * Revision 1.10.4.2 2005/10/17 04:45:57 arthchan2003</span>
<a name="l00066"></a>00066 <span class="comment"> * Free stuffs in cmn and feat corectly.</span>
<a name="l00067"></a>00067 <span class="comment"> *</span>
<a name="l00068"></a>00068 <span class="comment"> * Revision 1.10.4.1 2005/07/05 06:25:08 arthchan2003</span>
<a name="l00069"></a>00069 <span class="comment"> * Fixed dox-doc.</span>
<a name="l00070"></a>00070 <span class="comment"> *</span>
<a name="l00071"></a>00071 <span class="comment"> * Revision 1.10 2005/06/21 19:28:00 arthchan2003</span>
<a name="l00072"></a>00072 <span class="comment"> * 1, Fixed doxygen documentation. 2, Added $ keyword.</span>
<a name="l00073"></a>00073 <span class="comment"> *</span>
<a name="l00074"></a>00074 <span class="comment"> * Revision 1.3 2005/03/30 01:22:46 archan</span>
<a name="l00075"></a>00075 <span class="comment"> * Fixed mistakes in last updates. Add</span>
<a name="l00076"></a>00076 <span class="comment"> *</span>
<a name="l00077"></a>00077 <span class="comment"> * </span>
<a name="l00078"></a>00078 <span class="comment"> * 20.Apr.2001 RAH (rhoughton@mediasite.com, ricky.houghton@cs.cmu.edu)</span>
<a name="l00079"></a>00079 <span class="comment"> * Added cmn_free() and moved *mean and *var out global space and named them cmn_mean and cmn_var</span>
<a name="l00080"></a>00080 <span class="comment"> * </span>
<a name="l00081"></a>00081 <span class="comment"> * 28-Apr-1999 M K Ravishankar (rkm@cs.cmu.edu) at Carnegie Mellon University</span>
<a name="l00082"></a>00082 <span class="comment"> * Changed the name norm_mean() to cmn().</span>
<a name="l00083"></a>00083 <span class="comment"> * </span>
<a name="l00084"></a>00084 <span class="comment"> * 19-Jun-1996 M K Ravishankar (rkm@cs.cmu.edu) at Carnegie Mellon University</span>
<a name="l00085"></a>00085 <span class="comment"> * Changed to compute CMN over ALL dimensions of cep instead of 1..12.</span>
<a name="l00086"></a>00086 <span class="comment"> * </span>
<a name="l00087"></a>00087 <span class="comment"> * 04-Nov-1995 M K Ravishankar (rkm@cs.cmu.edu) at Carnegie Mellon University</span>
<a name="l00088"></a>00088 <span class="comment"> * Created.</span>
<a name="l00089"></a>00089 <span class="comment"> */</span>
<a name="l00090"></a>00090
<a name="l00091"></a>00091
<a name="l00092"></a>00092 <span class="preprocessor">#include <stdio.h></span>
<a name="l00093"></a>00093 <span class="preprocessor">#include <stdlib.h></span>
<a name="l00094"></a>00094 <span class="preprocessor">#include <string.h></span>
<a name="l00095"></a>00095 <span class="preprocessor">#include <assert.h></span>
<a name="l00096"></a>00096 <span class="preprocessor">#include <math.h></span>
<a name="l00097"></a>00097 <span class="preprocessor">#ifdef HAVE_CONFIG_H</span>
<a name="l00098"></a>00098 <span class="preprocessor"></span><span class="preprocessor">#include <config.h></span>
<a name="l00099"></a>00099 <span class="preprocessor">#endif</span>
<a name="l00100"></a>00100 <span class="preprocessor"></span>
<a name="l00101"></a>00101 <span class="preprocessor">#ifdef _MSC_VER</span>
<a name="l00102"></a>00102 <span class="preprocessor"></span><span class="preprocessor">#pragma warning (disable: 4244)</span>
<a name="l00103"></a>00103 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00104"></a>00104 <span class="preprocessor"></span>
<a name="l00105"></a>00105 <span class="preprocessor">#include "sphinxbase/ckd_alloc.h"</span>
<a name="l00106"></a>00106 <span class="preprocessor">#include "sphinxbase/err.h"</span>
<a name="l00107"></a>00107 <span class="preprocessor">#include "sphinxbase/cmn.h"</span>
<a name="l00108"></a>00108
<a name="l00109"></a>00109 <span class="comment">/* NOTE! These must match the enum in cmn.h */</span>
<a name="l00110"></a><a class="code" href="cmn_8h.html#ae2ab0bad7168386076c43fc2a421867f">00110</a> <span class="keyword">const</span> <span class="keywordtype">char</span> *<a class="code" href="cmn_8h.html#ae2ab0bad7168386076c43fc2a421867f" title="String representations of cmn_type_t values.">cmn_type_str</a>[] = {
<a name="l00111"></a>00111 <span class="stringliteral">"none"</span>,
<a name="l00112"></a>00112 <span class="stringliteral">"current"</span>,
<a name="l00113"></a>00113 <span class="stringliteral">"prior"</span>
<a name="l00114"></a>00114 };
<a name="l00115"></a>00115 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> n_cmn_type_str = <span class="keyword">sizeof</span>(<a class="code" href="cmn_8h.html#ae2ab0bad7168386076c43fc2a421867f" title="String representations of cmn_type_t values.">cmn_type_str</a>)/<span class="keyword">sizeof</span>(cmn_type_str[0]);
<a name="l00116"></a>00116
<a name="l00117"></a>00117 <a class="code" href="cmn_8h.html#a9384c411b10e9db9745cfb550a5c7652" title="Types of cepstral mean normalization to apply to the features.">cmn_type_t</a>
<a name="l00118"></a><a class="code" href="cmn_8h.html#acf5e65a03a0d74630add4a400fed0ce8">00118</a> <a class="code" href="cmn_8h.html#acf5e65a03a0d74630add4a400fed0ce8" title="Convert string representation (from command-line) to cmn_type_t.">cmn_type_from_str</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *str)
<a name="l00119"></a>00119 {
<a name="l00120"></a>00120 <span class="keywordtype">int</span> i;
<a name="l00121"></a>00121
<a name="l00122"></a>00122 <span class="keywordflow">for</span> (i = 0; i < n_cmn_type_str; ++i) {
<a name="l00123"></a>00123 <span class="keywordflow">if</span> (0 == strcmp(str, <a class="code" href="cmn_8h.html#ae2ab0bad7168386076c43fc2a421867f" title="String representations of cmn_type_t values.">cmn_type_str</a>[i]))
<a name="l00124"></a>00124 <span class="keywordflow">return</span> (<a class="code" href="cmn_8h.html#a9384c411b10e9db9745cfb550a5c7652" title="Types of cepstral mean normalization to apply to the features.">cmn_type_t</a>)i;
<a name="l00125"></a>00125 }
<a name="l00126"></a>00126 <a class="code" href="err_8h.html#a1a4495946ab2449d61108fe829a94613" title="Exit with non-zero status after error message.">E_FATAL</a>(<span class="stringliteral">"Unknown CMN type '%s'\n"</span>, str);
<a name="l00127"></a>00127 <span class="keywordflow">return</span> CMN_NONE;
<a name="l00128"></a>00128 }
<a name="l00129"></a>00129
<a name="l00130"></a>00130 <a class="code" href="structcmn__t.html" title="wrapper of operation of the cepstral mean normalization.">cmn_t</a> *
<a name="l00131"></a>00131 cmn_init(int32 veclen)
<a name="l00132"></a>00132 {
<a name="l00133"></a>00133 <a class="code" href="structcmn__t.html" title="wrapper of operation of the cepstral mean normalization.">cmn_t</a> *<a class="code" href="cmn_8h.html#accf10de8ef4d98b4bf591529cf16565e" title="CMN for the whole sentence.">cmn</a>;
<a name="l00134"></a>00134 cmn = (<a class="code" href="structcmn__t.html" title="wrapper of operation of the cepstral mean normalization.">cmn_t</a> *) <a class="code" href="ckd__alloc_8h.html#aa00ef21903bc4f8a972488417adc8d2e" title="Macros to simplify the use of above functions.">ckd_calloc</a>(1, <span class="keyword">sizeof</span>(<a class="code" href="structcmn__t.html" title="wrapper of operation of the cepstral mean normalization.">cmn_t</a>));
<a name="l00135"></a>00135 cmn-><a class="code" href="structcmn__t.html#a10472e0ad9272f764b512ade43f37d69" title="Length of cepstral vector.">veclen</a> = veclen;
<a name="l00136"></a>00136 cmn-><a class="code" href="structcmn__t.html#aef0faa6cd93f1d9cf12659c5980aefd2" title="Temporary variable: current means.">cmn_mean</a> = (mfcc_t *) <a class="code" href="ckd__alloc_8h.html#aa00ef21903bc4f8a972488417adc8d2e" title="Macros to simplify the use of above functions.">ckd_calloc</a>(veclen, <span class="keyword">sizeof</span>(mfcc_t));
<a name="l00137"></a>00137 cmn-><a class="code" href="structcmn__t.html#a72813f1c9423186f5bd66ecb39099eb5" title="Temporary variables: stored the cmn variance.">cmn_var</a> = (mfcc_t *) <a class="code" href="ckd__alloc_8h.html#aa00ef21903bc4f8a972488417adc8d2e" title="Macros to simplify the use of above functions.">ckd_calloc</a>(veclen, <span class="keyword">sizeof</span>(mfcc_t));
<a name="l00138"></a>00138 cmn-><a class="code" href="structcmn__t.html#adb70819b1ca822d5a4ee6dc94b3b48e7" title="The sum of the cmn frames.">sum</a> = (mfcc_t *) <a class="code" href="ckd__alloc_8h.html#aa00ef21903bc4f8a972488417adc8d2e" title="Macros to simplify the use of above functions.">ckd_calloc</a>(veclen, <span class="keyword">sizeof</span>(mfcc_t));
<a name="l00139"></a>00139 <span class="comment">/* A front-end dependent magic number */</span>
<a name="l00140"></a>00140 cmn-><a class="code" href="structcmn__t.html#aef0faa6cd93f1d9cf12659c5980aefd2" title="Temporary variable: current means.">cmn_mean</a>[0] = FLOAT2MFCC(12.0);
<a name="l00141"></a>00141 cmn-><a class="code" href="structcmn__t.html#a456cc3313e93fa3057b658fef64a0c53" title="Number of frames.">nframe</a> = 0;
<a name="l00142"></a>00142 <a class="code" href="err_8h.html#ac3c705943d946708cea0a1443be1c853" title="Print logging information to standard error stream.">E_INFO</a>(<span class="stringliteral">"mean[0]= %.2f, mean[1..%d]= 0.0\n"</span>,
<a name="l00143"></a>00143 MFCC2FLOAT(cmn-><a class="code" href="structcmn__t.html#aef0faa6cd93f1d9cf12659c5980aefd2" title="Temporary variable: current means.">cmn_mean</a>[0]), veclen - 1);
<a name="l00144"></a>00144
<a name="l00145"></a>00145 <span class="keywordflow">return</span> cmn;
<a name="l00146"></a>00146 }
<a name="l00147"></a>00147
<a name="l00148"></a>00148
<a name="l00149"></a>00149 <span class="keywordtype">void</span>
<a name="l00150"></a><a class="code" href="cmn_8h.html#accf10de8ef4d98b4bf591529cf16565e">00150</a> cmn(<a class="code" href="structcmn__t.html" title="wrapper of operation of the cepstral mean normalization.">cmn_t</a> *cmn, mfcc_t ** mfc, int32 varnorm, int32 n_frame)
<a name="l00151"></a>00151 {
<a name="l00152"></a>00152 mfcc_t *mfcp;
<a name="l00153"></a>00153 mfcc_t t;
<a name="l00154"></a>00154 int32 i, f;
<a name="l00155"></a>00155
<a name="l00156"></a>00156 assert(mfc != NULL);
<a name="l00157"></a>00157
<a name="l00158"></a>00158 <span class="keywordflow">if</span> (n_frame <= 0)
<a name="l00159"></a>00159 <span class="keywordflow">return</span>;
<a name="l00160"></a>00160
<a name="l00161"></a>00161 <span class="comment">/* If cmn->cmn_mean wasn't NULL, we need to zero the contents */</span>
<a name="l00162"></a>00162 memset(cmn-><a class="code" href="structcmn__t.html#aef0faa6cd93f1d9cf12659c5980aefd2" title="Temporary variable: current means.">cmn_mean</a>, 0, cmn-><a class="code" href="structcmn__t.html#a10472e0ad9272f764b512ade43f37d69" title="Length of cepstral vector.">veclen</a> * <span class="keyword">sizeof</span>(mfcc_t));
<a name="l00163"></a>00163
<a name="l00164"></a>00164 <span class="comment">/* Find mean cep vector for this utterance */</span>
<a name="l00165"></a>00165 <span class="keywordflow">for</span> (f = 0; f < n_frame; f++) {
<a name="l00166"></a>00166 mfcp = mfc[f];
<a name="l00167"></a>00167 <span class="keywordflow">for</span> (i = 0; i < cmn-><a class="code" href="structcmn__t.html#a10472e0ad9272f764b512ade43f37d69" title="Length of cepstral vector.">veclen</a>; i++) {
<a name="l00168"></a>00168 cmn-><a class="code" href="structcmn__t.html#aef0faa6cd93f1d9cf12659c5980aefd2" title="Temporary variable: current means.">cmn_mean</a>[i] += mfcp[i];
<a name="l00169"></a>00169 }
<a name="l00170"></a>00170 }
<a name="l00171"></a>00171
<a name="l00172"></a>00172 <span class="keywordflow">for</span> (i = 0; i < cmn-><a class="code" href="structcmn__t.html#a10472e0ad9272f764b512ade43f37d69" title="Length of cepstral vector.">veclen</a>; i++)
<a name="l00173"></a>00173 cmn-><a class="code" href="structcmn__t.html#aef0faa6cd93f1d9cf12659c5980aefd2" title="Temporary variable: current means.">cmn_mean</a>[i] /= n_frame;
<a name="l00174"></a>00174
<a name="l00175"></a>00175 <a class="code" href="err_8h.html#ac3c705943d946708cea0a1443be1c853" title="Print logging information to standard error stream.">E_INFO</a>(<span class="stringliteral">"CMN: "</span>);
<a name="l00176"></a>00176 <span class="keywordflow">for</span> (i = 0; i < cmn-><a class="code" href="structcmn__t.html#a10472e0ad9272f764b512ade43f37d69" title="Length of cepstral vector.">veclen</a>; i++)
<a name="l00177"></a>00177 <a class="code" href="err_8h.html#ae5a17ac5be8c738d3d977b1bea2d4538" title="Print logging information without header, to standard error stream.">E_INFOCONT</a>(<span class="stringliteral">"%5.2f "</span>, MFCC2FLOAT(cmn-><a class="code" href="structcmn__t.html#aef0faa6cd93f1d9cf12659c5980aefd2" title="Temporary variable: current means.">cmn_mean</a>[i]));
<a name="l00178"></a>00178 <a class="code" href="err_8h.html#ae5a17ac5be8c738d3d977b1bea2d4538" title="Print logging information without header, to standard error stream.">E_INFOCONT</a>(<span class="stringliteral">"\n"</span>);
<a name="l00179"></a>00179 <span class="keywordflow">if</span> (!varnorm) {
<a name="l00180"></a>00180 <span class="comment">/* Subtract mean from each cep vector */</span>
<a name="l00181"></a>00181 <span class="keywordflow">for</span> (f = 0; f < n_frame; f++) {
<a name="l00182"></a>00182 mfcp = mfc[f];
<a name="l00183"></a>00183 <span class="keywordflow">for</span> (i = 0; i < cmn-><a class="code" href="structcmn__t.html#a10472e0ad9272f764b512ade43f37d69" title="Length of cepstral vector.">veclen</a>; i++)
<a name="l00184"></a>00184 mfcp[i] -= cmn-><a class="code" href="structcmn__t.html#aef0faa6cd93f1d9cf12659c5980aefd2" title="Temporary variable: current means.">cmn_mean</a>[i];
<a name="l00185"></a>00185 }
<a name="l00186"></a>00186 }
<a name="l00187"></a>00187 <span class="keywordflow">else</span> {
<a name="l00188"></a>00188 <span class="comment">/* Scale cep vectors to have unit variance along each dimension, and subtract means */</span>
<a name="l00189"></a>00189 <span class="comment">/* If cmn->cmn_var wasn't NULL, we need to zero the contents */</span>
<a name="l00190"></a>00190 memset(cmn-><a class="code" href="structcmn__t.html#a72813f1c9423186f5bd66ecb39099eb5" title="Temporary variables: stored the cmn variance.">cmn_var</a>, 0, cmn-><a class="code" href="structcmn__t.html#a10472e0ad9272f764b512ade43f37d69" title="Length of cepstral vector.">veclen</a> * <span class="keyword">sizeof</span>(mfcc_t));
<a name="l00191"></a>00191
<a name="l00192"></a>00192 <span class="keywordflow">for</span> (f = 0; f < n_frame; f++) {
<a name="l00193"></a>00193 mfcp = mfc[f];
<a name="l00194"></a>00194
<a name="l00195"></a>00195 <span class="keywordflow">for</span> (i = 0; i < cmn-><a class="code" href="structcmn__t.html#a10472e0ad9272f764b512ade43f37d69" title="Length of cepstral vector.">veclen</a>; i++) {
<a name="l00196"></a>00196 t = mfcp[i] - cmn-><a class="code" href="structcmn__t.html#aef0faa6cd93f1d9cf12659c5980aefd2" title="Temporary variable: current means.">cmn_mean</a>[i];
<a name="l00197"></a>00197 cmn-><a class="code" href="structcmn__t.html#a72813f1c9423186f5bd66ecb39099eb5" title="Temporary variables: stored the cmn variance.">cmn_var</a>[i] += MFCCMUL(t, t);
<a name="l00198"></a>00198 }
<a name="l00199"></a>00199 }
<a name="l00200"></a>00200 <span class="keywordflow">for</span> (i = 0; i < cmn-><a class="code" href="structcmn__t.html#a10472e0ad9272f764b512ade43f37d69" title="Length of cepstral vector.">veclen</a>; i++)
<a name="l00201"></a>00201 <span class="comment">/* Inverse Std. Dev, RAH added type case from sqrt */</span>
<a name="l00202"></a>00202 cmn-><a class="code" href="structcmn__t.html#a72813f1c9423186f5bd66ecb39099eb5" title="Temporary variables: stored the cmn variance.">cmn_var</a>[i] = FLOAT2MFCC(sqrt((float64)n_frame / MFCC2FLOAT(cmn-><a class="code" href="structcmn__t.html#a72813f1c9423186f5bd66ecb39099eb5" title="Temporary variables: stored the cmn variance.">cmn_var</a>[i])));
<a name="l00203"></a>00203
<a name="l00204"></a>00204 <span class="keywordflow">for</span> (f = 0; f < n_frame; f++) {
<a name="l00205"></a>00205 mfcp = mfc[f];
<a name="l00206"></a>00206 <span class="keywordflow">for</span> (i = 0; i < cmn-><a class="code" href="structcmn__t.html#a10472e0ad9272f764b512ade43f37d69" title="Length of cepstral vector.">veclen</a>; i++)
<a name="l00207"></a>00207 mfcp[i] = MFCCMUL((mfcp[i] - cmn-><a class="code" href="structcmn__t.html#aef0faa6cd93f1d9cf12659c5980aefd2" title="Temporary variable: current means.">cmn_mean</a>[i]), cmn-><a class="code" href="structcmn__t.html#a72813f1c9423186f5bd66ecb39099eb5" title="Temporary variables: stored the cmn variance.">cmn_var</a>[i]);
<a name="l00208"></a>00208 }
<a name="l00209"></a>00209 }
<a name="l00210"></a>00210 }
<a name="l00211"></a>00211
<a name="l00212"></a>00212 <span class="comment">/* </span>
<a name="l00213"></a>00213 <span class="comment"> * RAH, free previously allocated memory</span>
<a name="l00214"></a>00214 <span class="comment"> */</span>
<a name="l00215"></a>00215 <span class="keywordtype">void</span>
<a name="l00216"></a>00216 cmn_free(<a class="code" href="structcmn__t.html" title="wrapper of operation of the cepstral mean normalization.">cmn_t</a> * cmn)
<a name="l00217"></a>00217 {
<a name="l00218"></a>00218 <span class="keywordflow">if</span> (cmn != NULL) {
<a name="l00219"></a>00219 <span class="keywordflow">if</span> (cmn-><a class="code" href="structcmn__t.html#a72813f1c9423186f5bd66ecb39099eb5" title="Temporary variables: stored the cmn variance.">cmn_var</a>)
<a name="l00220"></a>00220 <a class="code" href="ckd__alloc_8h.html#a31c6b405558620ac37599737b5722fbf" title="Test and free a 1-D array.">ckd_free</a>((<span class="keywordtype">void</span> *) cmn-><a class="code" href="structcmn__t.html#a72813f1c9423186f5bd66ecb39099eb5" title="Temporary variables: stored the cmn variance.">cmn_var</a>);
<a name="l00221"></a>00221
<a name="l00222"></a>00222 <span class="keywordflow">if</span> (cmn-><a class="code" href="structcmn__t.html#aef0faa6cd93f1d9cf12659c5980aefd2" title="Temporary variable: current means.">cmn_mean</a>)
<a name="l00223"></a>00223 <a class="code" href="ckd__alloc_8h.html#a31c6b405558620ac37599737b5722fbf" title="Test and free a 1-D array.">ckd_free</a>((<span class="keywordtype">void</span> *) cmn-><a class="code" href="structcmn__t.html#aef0faa6cd93f1d9cf12659c5980aefd2" title="Temporary variable: current means.">cmn_mean</a>);
<a name="l00224"></a>00224
<a name="l00225"></a>00225 <span class="keywordflow">if</span> (cmn-><a class="code" href="structcmn__t.html#adb70819b1ca822d5a4ee6dc94b3b48e7" title="The sum of the cmn frames.">sum</a>)
<a name="l00226"></a>00226 <a class="code" href="ckd__alloc_8h.html#a31c6b405558620ac37599737b5722fbf" title="Test and free a 1-D array.">ckd_free</a>((<span class="keywordtype">void</span> *) cmn-><a class="code" href="structcmn__t.html#adb70819b1ca822d5a4ee6dc94b3b48e7" title="The sum of the cmn frames.">sum</a>);
<a name="l00227"></a>00227
<a name="l00228"></a>00228 <a class="code" href="ckd__alloc_8h.html#a31c6b405558620ac37599737b5722fbf" title="Test and free a 1-D array.">ckd_free</a>((<span class="keywordtype">void</span> *) cmn);
<a name="l00229"></a>00229 }
<a name="l00230"></a>00230 }
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