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<h1>src/libsphinxbase/fe/fe_warp.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) 2006 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"> *</span>
<a name="l00039"></a>00039 <span class="comment"> * File: fe_warp.c</span>
<a name="l00040"></a>00040 <span class="comment"> * </span>
<a name="l00041"></a>00041 <span class="comment"> * Description: </span>
<a name="l00042"></a>00042 <span class="comment"> * Allows a caller to choose a warping function.</span>
<a name="l00043"></a>00043 <span class="comment"> *********************************************************************/</span>
<a name="l00044"></a>00044
<a name="l00045"></a>00045 <span class="comment">/* static char rcsid[] = "@(#)$Id: fe_warp.c,v 1.2 2006/02/17 00:31:34 egouvea Exp $";*/</span>
<a name="l00046"></a>00046
<a name="l00047"></a>00047 <span class="preprocessor">#include "fe_warp_inverse_linear.h"</span>
<a name="l00048"></a>00048 <span class="preprocessor">#include "fe_warp_affine.h"</span>
<a name="l00049"></a>00049 <span class="preprocessor">#include "fe_warp_piecewise_linear.h"</span>
<a name="l00050"></a>00050 <span class="preprocessor">#include "fe_warp.h"</span>
<a name="l00051"></a>00051
<a name="l00052"></a>00052 <span class="preprocessor">#include "sphinxbase/err.h"</span>
<a name="l00053"></a>00053
<a name="l00054"></a>00054 <span class="preprocessor">#include <stdio.h></span>
<a name="l00055"></a>00055 <span class="preprocessor">#include <string.h></span>
<a name="l00056"></a>00056 <span class="preprocessor">#include <assert.h></span>
<a name="l00057"></a>00057 <span class="preprocessor">#include <stdlib.h></span>
<a name="l00058"></a>00058
<a name="l00059"></a>00059 <span class="comment">/* This is for aliases for each of the entries below. Currently not</span>
<a name="l00060"></a>00060 <span class="comment"> used.</span>
<a name="l00061"></a>00061 <span class="comment">*/</span>
<a name="l00062"></a>00062 <span class="keyword">static</span> <span class="keywordtype">char</span> *__name2id[] = {
<a name="l00063"></a>00063 <span class="stringliteral">"inverse"</span>,
<a name="l00064"></a>00064 <span class="stringliteral">"linear"</span>,
<a name="l00065"></a>00065 <span class="stringliteral">"piecewise"</span>,
<a name="l00066"></a>00066 NULL
<a name="l00067"></a>00067 };
<a name="l00068"></a>00068
<a name="l00069"></a>00069 <span class="keyword">static</span> <span class="keywordtype">char</span> *name2id[] = {
<a name="l00070"></a>00070 <span class="stringliteral">"inverse_linear"</span>,
<a name="l00071"></a>00071 <span class="stringliteral">"affine"</span>,
<a name="l00072"></a>00072 <span class="stringliteral">"piecewise_linear"</span>,
<a name="l00073"></a>00073 NULL
<a name="l00074"></a>00074 };
<a name="l00075"></a>00075
<a name="l00076"></a>00076 <span class="keyword">static</span> <a class="code" href="structfe__warp__conf__t.html">fe_warp_conf_t</a> fe_warp_conf[FE_WARP_ID_MAX + 1] = {
<a name="l00077"></a>00077 {fe_warp_inverse_linear_set_parameters,
<a name="l00078"></a>00078 fe_warp_inverse_linear_doc,
<a name="l00079"></a>00079 fe_warp_inverse_linear_id,
<a name="l00080"></a>00080 fe_warp_inverse_linear_n_param,
<a name="l00081"></a>00081 fe_warp_inverse_linear_warped_to_unwarped,
<a name="l00082"></a>00082 fe_warp_inverse_linear_unwarped_to_warped,
<a name="l00083"></a>00083 fe_warp_inverse_linear_print}, <span class="comment">/* Inverse linear warping */</span>
<a name="l00084"></a>00084 {fe_warp_affine_set_parameters,
<a name="l00085"></a>00085 fe_warp_affine_doc,
<a name="l00086"></a>00086 fe_warp_affine_id,
<a name="l00087"></a>00087 fe_warp_affine_n_param,
<a name="l00088"></a>00088 fe_warp_affine_warped_to_unwarped,
<a name="l00089"></a>00089 fe_warp_affine_unwarped_to_warped,
<a name="l00090"></a>00090 fe_warp_affine_print}, <span class="comment">/* Affine warping */</span>
<a name="l00091"></a>00091 {fe_warp_piecewise_linear_set_parameters,
<a name="l00092"></a>00092 fe_warp_piecewise_linear_doc,
<a name="l00093"></a>00093 fe_warp_piecewise_linear_id,
<a name="l00094"></a>00094 fe_warp_piecewise_linear_n_param,
<a name="l00095"></a>00095 fe_warp_piecewise_linear_warped_to_unwarped,
<a name="l00096"></a>00096 fe_warp_piecewise_linear_unwarped_to_warped,
<a name="l00097"></a>00097 fe_warp_piecewise_linear_print}, <span class="comment">/* Piecewise_Linear warping */</span>
<a name="l00098"></a>00098 };
<a name="l00099"></a>00099
<a name="l00100"></a>00100 <span class="keywordtype">int</span>
<a name="l00101"></a>00101 fe_warp_set(<a class="code" href="structmelfb__s.html" title="Base Struct to hold all structure for MFCC computation.">melfb_t</a> *mel, <span class="keyword">const</span> <span class="keywordtype">char</span> *id_name)
<a name="l00102"></a>00102 {
<a name="l00103"></a>00103 uint32 i;
<a name="l00104"></a>00104
<a name="l00105"></a>00105 <span class="keywordflow">for</span> (i = 0; name2id[i]; i++) {
<a name="l00106"></a>00106 <span class="keywordflow">if</span> (strcmp(id_name, name2id[i]) == 0) {
<a name="l00107"></a>00107 mel->warp_id = i;
<a name="l00108"></a>00108 <span class="keywordflow">break</span>;
<a name="l00109"></a>00109 }
<a name="l00110"></a>00110 }
<a name="l00111"></a>00111
<a name="l00112"></a>00112 <span class="keywordflow">if</span> (name2id[i] == NULL) {
<a name="l00113"></a>00113 <span class="keywordflow">for</span> (i = 0; __name2id[i]; i++) {
<a name="l00114"></a>00114 <span class="keywordflow">if</span> (strcmp(id_name, __name2id[i]) == 0) {
<a name="l00115"></a>00115 mel->warp_id = i;
<a name="l00116"></a>00116 <span class="keywordflow">break</span>;
<a name="l00117"></a>00117 }
<a name="l00118"></a>00118 }
<a name="l00119"></a>00119 <span class="keywordflow">if</span> (__name2id[i] == NULL) {
<a name="l00120"></a>00120 <a class="code" href="err_8h.html#a5f7b2f58f5a663a6bdd51f197ae21993" title="Print error message to standard error stream.">E_ERROR</a>(<span class="stringliteral">"Unimplemented warping function %s\n"</span>, id_name);
<a name="l00121"></a>00121 <a class="code" href="err_8h.html#a5f7b2f58f5a663a6bdd51f197ae21993" title="Print error message to standard error stream.">E_ERROR</a>(<span class="stringliteral">"Implemented functions are:\n"</span>);
<a name="l00122"></a>00122 <span class="keywordflow">for</span> (i = 0; name2id[i]; i++) {
<a name="l00123"></a>00123 fprintf(stderr, <span class="stringliteral">"\t%s\n"</span>, name2id[i]);
<a name="l00124"></a>00124 }
<a name="l00125"></a>00125 mel->warp_id = FE_WARP_ID_NONE;
<a name="l00126"></a>00126
<a name="l00127"></a>00127 <span class="keywordflow">return</span> FE_START_ERROR;
<a name="l00128"></a>00128 }
<a name="l00129"></a>00129 }
<a name="l00130"></a>00130
<a name="l00131"></a>00131 <span class="keywordflow">return</span> FE_SUCCESS;
<a name="l00132"></a>00132 }
<a name="l00133"></a>00133
<a name="l00134"></a>00134 <span class="keywordtype">void</span>
<a name="l00135"></a>00135 fe_warp_set_parameters(<a class="code" href="structmelfb__s.html" title="Base Struct to hold all structure for MFCC computation.">melfb_t</a> *mel, <span class="keywordtype">char</span> <span class="keyword">const</span> *param_str, <span class="keywordtype">float</span> sampling_rate)
<a name="l00136"></a>00136 {
<a name="l00137"></a>00137 <span class="keywordflow">if</span> (mel->warp_id <= FE_WARP_ID_MAX) {
<a name="l00138"></a>00138 fe_warp_conf[mel->warp_id].set_parameters(param_str, sampling_rate);
<a name="l00139"></a>00139 }
<a name="l00140"></a>00140 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (mel->warp_id == FE_WARP_ID_NONE) {
<a name="l00141"></a>00141 <a class="code" href="err_8h.html#a1a4495946ab2449d61108fe829a94613" title="Exit with non-zero status after error message.">E_FATAL</a>(<span class="stringliteral">"feat module must be configured w/ a valid ID\n"</span>);
<a name="l00142"></a>00142 }
<a name="l00143"></a>00143 <span class="keywordflow">else</span> {
<a name="l00144"></a>00144 <a class="code" href="err_8h.html#a1a4495946ab2449d61108fe829a94613" title="Exit with non-zero status after error message.">E_FATAL</a>
<a name="l00145"></a>00145 (<span class="stringliteral">"fe_warp module misconfigured with invalid fe_warp_id %u\n"</span>,
<a name="l00146"></a>00146 mel->warp_id);
<a name="l00147"></a>00147 }
<a name="l00148"></a>00148 }
<a name="l00149"></a>00149
<a name="l00150"></a>00150 <span class="keyword">const</span> <span class="keywordtype">char</span> *
<a name="l00151"></a>00151 fe_warp_doc(<a class="code" href="structmelfb__s.html" title="Base Struct to hold all structure for MFCC computation.">melfb_t</a> *mel)
<a name="l00152"></a>00152 {
<a name="l00153"></a>00153 <span class="keywordflow">if</span> (mel->warp_id <= FE_WARP_ID_MAX) {
<a name="l00154"></a>00154 <span class="keywordflow">return</span> fe_warp_conf[mel->warp_id].doc();
<a name="l00155"></a>00155 }
<a name="l00156"></a>00156 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (mel->warp_id == FE_WARP_ID_NONE) {
<a name="l00157"></a>00157 <a class="code" href="err_8h.html#a1a4495946ab2449d61108fe829a94613" title="Exit with non-zero status after error message.">E_FATAL</a>(<span class="stringliteral">"fe_warp module must be configured w/ a valid ID\n"</span>);
<a name="l00158"></a>00158 }
<a name="l00159"></a>00159 <span class="keywordflow">else</span> {
<a name="l00160"></a>00160 <a class="code" href="err_8h.html#a1a4495946ab2449d61108fe829a94613" title="Exit with non-zero status after error message.">E_FATAL</a>
<a name="l00161"></a>00161 (<span class="stringliteral">"fe_warp module misconfigured with invalid fe_warp_id %u\n"</span>,
<a name="l00162"></a>00162 mel->warp_id);
<a name="l00163"></a>00163 }
<a name="l00164"></a>00164
<a name="l00165"></a>00165 <span class="keywordflow">return</span> NULL;
<a name="l00166"></a>00166 }
<a name="l00167"></a>00167
<a name="l00168"></a>00168 uint32
<a name="l00169"></a>00169 fe_warp_id(<a class="code" href="structmelfb__s.html" title="Base Struct to hold all structure for MFCC computation.">melfb_t</a> *mel)
<a name="l00170"></a>00170 {
<a name="l00171"></a>00171 <span class="keywordflow">if</span> (mel->warp_id <= FE_WARP_ID_MAX) {
<a name="l00172"></a>00172 assert(mel->warp_id == fe_warp_conf[mel->warp_id].id());
<a name="l00173"></a>00173 <span class="keywordflow">return</span> mel->warp_id;
<a name="l00174"></a>00174 }
<a name="l00175"></a>00175 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (mel->warp_id != FE_WARP_ID_NONE) {
<a name="l00176"></a>00176 <a class="code" href="err_8h.html#a1a4495946ab2449d61108fe829a94613" title="Exit with non-zero status after error message.">E_FATAL</a>
<a name="l00177"></a>00177 (<span class="stringliteral">"fe_warp module misconfigured with invalid fe_warp_id %u\n"</span>,
<a name="l00178"></a>00178 mel->warp_id);
<a name="l00179"></a>00179 }
<a name="l00180"></a>00180
<a name="l00181"></a>00181 <span class="keywordflow">return</span> FE_WARP_ID_NONE;
<a name="l00182"></a>00182 }
<a name="l00183"></a>00183
<a name="l00184"></a>00184 uint32
<a name="l00185"></a>00185 fe_warp_n_param(<a class="code" href="structmelfb__s.html" title="Base Struct to hold all structure for MFCC computation.">melfb_t</a> *mel)
<a name="l00186"></a>00186 {
<a name="l00187"></a>00187 <span class="keywordflow">if</span> (mel->warp_id <= FE_WARP_ID_MAX) {
<a name="l00188"></a>00188 <span class="keywordflow">return</span> fe_warp_conf[mel->warp_id].n_param();
<a name="l00189"></a>00189 }
<a name="l00190"></a>00190 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (mel->warp_id == FE_WARP_ID_NONE) {
<a name="l00191"></a>00191 <a class="code" href="err_8h.html#a1a4495946ab2449d61108fe829a94613" title="Exit with non-zero status after error message.">E_FATAL</a>(<span class="stringliteral">"fe_warp module must be configured w/ a valid ID\n"</span>);
<a name="l00192"></a>00192 }
<a name="l00193"></a>00193 <span class="keywordflow">else</span> {
<a name="l00194"></a>00194 <a class="code" href="err_8h.html#a1a4495946ab2449d61108fe829a94613" title="Exit with non-zero status after error message.">E_FATAL</a>
<a name="l00195"></a>00195 (<span class="stringliteral">"fe_warp module misconfigured with invalid fe_warp_id %u\n"</span>,
<a name="l00196"></a>00196 mel->warp_id);
<a name="l00197"></a>00197 }
<a name="l00198"></a>00198
<a name="l00199"></a>00199 <span class="keywordflow">return</span> 0;
<a name="l00200"></a>00200 }
<a name="l00201"></a>00201
<a name="l00202"></a>00202 <span class="keywordtype">float</span>
<a name="l00203"></a>00203 fe_warp_warped_to_unwarped(<a class="code" href="structmelfb__s.html" title="Base Struct to hold all structure for MFCC computation.">melfb_t</a> *mel, <span class="keywordtype">float</span> nonlinear)
<a name="l00204"></a>00204 {
<a name="l00205"></a>00205 <span class="keywordflow">if</span> (mel->warp_id <= FE_WARP_ID_MAX) {
<a name="l00206"></a>00206 <span class="keywordflow">return</span> fe_warp_conf[mel->warp_id].warped_to_unwarped(nonlinear);
<a name="l00207"></a>00207 }
<a name="l00208"></a>00208 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (mel->warp_id == FE_WARP_ID_NONE) {
<a name="l00209"></a>00209 <a class="code" href="err_8h.html#a1a4495946ab2449d61108fe829a94613" title="Exit with non-zero status after error message.">E_FATAL</a>(<span class="stringliteral">"fe_warp module must be configured w/ a valid ID\n"</span>);
<a name="l00210"></a>00210 }
<a name="l00211"></a>00211 <span class="keywordflow">else</span> {
<a name="l00212"></a>00212 <a class="code" href="err_8h.html#a1a4495946ab2449d61108fe829a94613" title="Exit with non-zero status after error message.">E_FATAL</a>
<a name="l00213"></a>00213 (<span class="stringliteral">"fe_warp module misconfigured with invalid fe_warp_id %u\n"</span>,
<a name="l00214"></a>00214 mel->warp_id);
<a name="l00215"></a>00215 }
<a name="l00216"></a>00216
<a name="l00217"></a>00217 <span class="keywordflow">return</span> 0;
<a name="l00218"></a>00218 }
<a name="l00219"></a>00219
<a name="l00220"></a>00220 <span class="keywordtype">float</span>
<a name="l00221"></a>00221 fe_warp_unwarped_to_warped(<a class="code" href="structmelfb__s.html" title="Base Struct to hold all structure for MFCC computation.">melfb_t</a> *mel,<span class="keywordtype">float</span> linear)
<a name="l00222"></a>00222 {
<a name="l00223"></a>00223 <span class="keywordflow">if</span> (mel->warp_id <= FE_WARP_ID_MAX) {
<a name="l00224"></a>00224 <span class="keywordflow">return</span> fe_warp_conf[mel->warp_id].unwarped_to_warped(linear);
<a name="l00225"></a>00225 }
<a name="l00226"></a>00226 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (mel->warp_id == FE_WARP_ID_NONE) {
<a name="l00227"></a>00227 <a class="code" href="err_8h.html#a1a4495946ab2449d61108fe829a94613" title="Exit with non-zero status after error message.">E_FATAL</a>(<span class="stringliteral">"fe_warp module must be configured w/ a valid ID\n"</span>);
<a name="l00228"></a>00228 }
<a name="l00229"></a>00229 <span class="keywordflow">else</span> {
<a name="l00230"></a>00230 <a class="code" href="err_8h.html#a1a4495946ab2449d61108fe829a94613" title="Exit with non-zero status after error message.">E_FATAL</a>
<a name="l00231"></a>00231 (<span class="stringliteral">"fe_warp module misconfigured with invalid fe_warp_id %u\n"</span>,
<a name="l00232"></a>00232 mel->warp_id);
<a name="l00233"></a>00233 }
<a name="l00234"></a>00234
<a name="l00235"></a>00235 <span class="keywordflow">return</span> 0;
<a name="l00236"></a>00236 }
<a name="l00237"></a>00237
<a name="l00238"></a>00238 <span class="keywordtype">void</span>
<a name="l00239"></a>00239 fe_warp_print(<a class="code" href="structmelfb__s.html" title="Base Struct to hold all structure for MFCC computation.">melfb_t</a> *mel, <span class="keyword">const</span> <span class="keywordtype">char</span> *label)
<a name="l00240"></a>00240 {
<a name="l00241"></a>00241 <span class="keywordflow">if</span> (mel->warp_id <= FE_WARP_ID_MAX) {
<a name="l00242"></a>00242 fe_warp_conf[mel->warp_id].print(label);
<a name="l00243"></a>00243 }
<a name="l00244"></a>00244 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (mel->warp_id == FE_WARP_ID_NONE) {
<a name="l00245"></a>00245 <a class="code" href="err_8h.html#a1a4495946ab2449d61108fe829a94613" title="Exit with non-zero status after error message.">E_FATAL</a>(<span class="stringliteral">"fe_warp module must be configured w/ a valid ID\n"</span>);
<a name="l00246"></a>00246 }
<a name="l00247"></a>00247 <span class="keywordflow">else</span> {
<a name="l00248"></a>00248 <a class="code" href="err_8h.html#a1a4495946ab2449d61108fe829a94613" title="Exit with non-zero status after error message.">E_FATAL</a>
<a name="l00249"></a>00249 (<span class="stringliteral">"fe_warp module misconfigured with invalid fe_warp_id %u\n"</span>,
<a name="l00250"></a>00250 mel->warp_id);
<a name="l00251"></a>00251 }
<a name="l00252"></a>00252 }
<a name="l00253"></a>00253
<a name="l00254"></a>00254 <span class="comment">/*</span>
<a name="l00255"></a>00255 <span class="comment"> * Log record. Maintained by RCS.</span>
<a name="l00256"></a>00256 <span class="comment"> *</span>
<a name="l00257"></a>00257 <span class="comment"> * $Log: fe_warp.c,v $</span>
<a name="l00258"></a>00258 <span class="comment"> * Revision 1.2 2006/02/17 00:31:34 egouvea</span>
<a name="l00259"></a>00259 <span class="comment"> * Removed switch -melwarp. Changed the default for window length to</span>
<a name="l00260"></a>00260 <span class="comment"> * 0.025625 from 0.256 (so that a window at 16kHz sampling rate has</span>
<a name="l00261"></a>00261 <span class="comment"> * exactly 410 samples). Cleaned up include's. Replaced some E_FATAL()</span>
<a name="l00262"></a>00262 <span class="comment"> * with E_WARN() and return.</span>
<a name="l00263"></a>00263 <span class="comment"> *</span>
<a name="l00264"></a>00264 <span class="comment"> * Revision 1.1 2006/02/16 00:18:26 egouvea</span>
<a name="l00265"></a>00265 <span class="comment"> * Implemented flexible warping function. The user can specify at run</span>
<a name="l00266"></a>00266 <span class="comment"> * time which of several shapes they want to use. Currently implemented</span>
<a name="l00267"></a>00267 <span class="comment"> * are an affine function (y = ax + b), an inverse linear (y = a/x) and a</span>
<a name="l00268"></a>00268 <span class="comment"> * piecewise linear (y = ax, up to a frequency F, and then it "breaks" so</span>
<a name="l00269"></a>00269 <span class="comment"> * Nyquist frequency matches in both scales.</span>
<a name="l00270"></a>00270 <span class="comment"> *</span>
<a name="l00271"></a>00271 <span class="comment"> * Added two switches, -warp_type and -warp_params. The first specifies</span>
<a name="l00272"></a>00272 <span class="comment"> * the type, which valid values:</span>
<a name="l00273"></a>00273 <span class="comment"> *</span>
<a name="l00274"></a>00274 <span class="comment"> * -inverse or inverse_linear</span>
<a name="l00275"></a>00275 <span class="comment"> * -linear or affine</span>
<a name="l00276"></a>00276 <span class="comment"> * -piecewise or piecewise_linear</span>
<a name="l00277"></a>00277 <span class="comment"> *</span>
<a name="l00278"></a>00278 <span class="comment"> * The inverse_linear is the same as implemented by EHT. The -mel_warp</span>
<a name="l00279"></a>00279 <span class="comment"> * switch was kept for compatibility (maybe remove it in the</span>
<a name="l00280"></a>00280 <span class="comment"> * future?). The code is compatible with EHT's changes: cepstra created</span>
<a name="l00281"></a>00281 <span class="comment"> * from code after his changes should be the same as now. Scripts that</span>
<a name="l00282"></a>00282 <span class="comment"> * worked with his changes should work now without changes. Tested a few</span>
<a name="l00283"></a>00283 <span class="comment"> * cases, same results.</span>
<a name="l00284"></a>00284 <span class="comment"> *</span>
<a name="l00285"></a>00285 <span class="comment"> */</span>
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