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<div class="title">fe_warp_piecewise_linear.c</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">/* ====================================================================</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * Copyright (c) 2006 Carnegie Mellon University. All rights </span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * reserved.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * Redistribution and use in source and binary forms, with or without</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * modification, are permitted provided that the following conditions</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * are met:</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * 1. Redistributions of source code must retain the above copyright</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * notice, this list of conditions and the following disclaimer. </span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * notice, this list of conditions and the following disclaimer in</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * the documentation and/or other materials provided with the</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * distribution.</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * This work was supported in part by funding from the Defense Advanced </span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * Research Projects Agency and the National Science Foundation of the </span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * United States of America, and the CMU Sphinx Speech Consortium.</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND </span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, </span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT </span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, </span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY </span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT </span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE </span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> * ====================================================================</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment">/*********************************************************************</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> * File: fe_warp_piecewise_linear.c</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> * </span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> * Description: </span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> * Warp the frequency axis according to an piecewise linear</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> * function. The function is linear up to a frequency F, where</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> * the slope changes so that the Nyquist frequency in the warped</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> * axis maps to the Nyquist frequency in the unwarped.</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment"> * w' = a * w, w < F</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> * w' = a' * w + b, W > F</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> * w'(0) = 0</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> * w'(F) = F</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> * w'(Nyq) = Nyq</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"> * </span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment"> *********************************************************************/</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment">/* static char rcsid[] = "@(#)$Id: fe_warp_piecewise_linear.c,v 1.2 2006/02/17 00:31:34 egouvea Exp $"; */</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> </div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="preprocessor">#include <stdio.h></span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="preprocessor">#include <stdlib.h></span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="preprocessor">#include <math.h></span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="preprocessor">#include <string.h></span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="preprocessor">#ifdef _MSC_VER</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="preprocessor">#pragma warning (disable: 4996)</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> </div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="preprocessor">#include "<a class="code" href="strfuncs_8h.html">sphinxbase/strfuncs.h</a>"</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="preprocessor">#include "<a class="code" href="err_8h.html">sphinxbase/err.h</a>"</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="preprocessor">#include "fe_warp.h"</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="preprocessor">#include "fe_warp_piecewise_linear.h"</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="preprocessor">#define N_PARAM 2</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="preprocessor">#define YES 1</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="preprocessor">#define NO 0</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> </div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment"> * params[0] : a</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"> * params[1] : F (the non-differentiable point)</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="keyword">static</span> <span class="keywordtype">float</span> params[N_PARAM] = { 1.0f, 6800.0f };</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="keyword">static</span> <span class="keywordtype">float</span> final_piece[2];</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="keyword">static</span> int32 is_neutral = YES;</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="keyword">static</span> <span class="keywordtype">char</span> p_str[256] = <span class="stringliteral">""</span>;</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="keyword">static</span> <span class="keywordtype">float</span> nyquist_frequency = 0.0f;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  </div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> </div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> fe_warp_piecewise_linear_doc()</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> {</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keywordflow">return</span> <span class="stringliteral">"piecewise_linear :== < w' = a * w, w < F >"</span>;</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> }</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  </div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> uint32</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> fe_warp_piecewise_linear_id()</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> {</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordflow">return</span> FE_WARP_ID_PIECEWISE_LINEAR;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> }</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  </div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> uint32</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> fe_warp_piecewise_linear_n_param()</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> {</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordflow">return</span> N_PARAM;</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> }</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  </div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> fe_warp_piecewise_linear_set_parameters(<span class="keywordtype">char</span> <span class="keyword">const</span> *param_str,</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordtype">float</span> sampling_rate)</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> {</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordtype">char</span> *tok;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordtype">char</span> *seps = <span class="stringliteral">" \t"</span>;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordtype">char</span> temp_param_str[256];</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordtype">int</span> param_index = 0;</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> </div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  nyquist_frequency = sampling_rate / 2;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordflow">if</span> (param_str == NULL) {</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  is_neutral = YES;</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  }</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="comment">/* The new parameters are the same as the current ones, so do nothing. */</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">if</span> (strcmp(param_str, p_str) == 0) {</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  }</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  is_neutral = NO;</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  strcpy(temp_param_str, param_str);</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  memset(params, 0, N_PARAM * <span class="keyword">sizeof</span>(<span class="keywordtype">float</span>));</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  memset(final_piece, 0, 2 * <span class="keyword">sizeof</span>(<span class="keywordtype">float</span>));</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  strcpy(p_str, param_str);</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="comment">/* FIXME: strtok() is not re-entrant... */</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  tok = strtok(temp_param_str, seps);</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="keywordflow">while</span> (tok != NULL) {</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  params[param_index++] = (float) <a class="code" href="strfuncs_8h.html#ab708351fe7308551632a782bfad75a1e">atof_c</a>(tok);</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  tok = strtok(NULL, seps);</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keywordflow">if</span> (param_index >= N_PARAM) {</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  }</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  }</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keywordflow">if</span> (tok != NULL) {</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <a class="code" href="err_8h.html#ac3c705943d946708cea0a1443be1c853">E_INFO</a></div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  (<span class="stringliteral">"Piecewise linear warping takes up to two arguments, %s ignored.\n"</span>,</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  tok);</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  }</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="keywordflow">if</span> (params[1] < sampling_rate) {</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="comment">/* Precompute these. These are the coefficients of a</span></div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="comment"> * straight line that contains the points (F, aF) and (N,</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> <span class="comment"> * N), where a = params[0], F = params[1], N = Nyquist</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="comment"> * frequency.</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keywordflow">if</span> (params[1] == 0) {</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  params[1] = sampling_rate * 0.85f;</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  }</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  final_piece[0] =</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  (nyquist_frequency -</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  params[0] * params[1]) / (nyquist_frequency - params[1]);</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  final_piece[1] =</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  nyquist_frequency * params[1] * (params[0] -</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  1.0f) / (nyquist_frequency -</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  params[1]);</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  }</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  memset(final_piece, 0, 2 * <span class="keyword">sizeof</span>(<span class="keywordtype">float</span>));</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  }</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keywordflow">if</span> (params[0] == 0) {</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  is_neutral = YES;</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <a class="code" href="err_8h.html#ac3c705943d946708cea0a1443be1c853">E_INFO</a></div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  (<span class="stringliteral">"Piecewise linear warping cannot have slope zero, warping not applied.\n"</span>);</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  }</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> }</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  </div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span> <span class="keywordtype">float</span></div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> fe_warp_piecewise_linear_warped_to_unwarped(<span class="keywordtype">float</span> nonlinear)</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> {</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="keywordflow">if</span> (is_neutral) {</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="keywordflow">return</span> nonlinear;</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  }</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <span class="comment">/* linear = (nonlinear - b) / a */</span></div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <span class="keywordtype">float</span> temp;</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <span class="keywordflow">if</span> (nonlinear < params[0] * params[1]) {</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  temp = nonlinear / params[0];</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  }</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  temp = nonlinear - final_piece[1];</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  temp /= final_piece[0];</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  }</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="keywordflow">if</span> (temp > nyquist_frequency) {</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <a class="code" href="err_8h.html#a6a794bec721b555ac1f2167f9e12f662">E_WARN</a></div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  (<span class="stringliteral">"Warp factor %g results in frequency (%.1f) higher than Nyquist (%.1f)\n"</span>,</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  params[0], temp, nyquist_frequency);</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  }</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="keywordflow">return</span> temp;</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  }</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> }</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  </div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> <span class="keywordtype">float</span></div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> fe_warp_piecewise_linear_unwarped_to_warped(<span class="keywordtype">float</span> linear)</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> {</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  <span class="keywordflow">if</span> (is_neutral) {</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="keywordflow">return</span> linear;</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  }</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="keywordtype">float</span> temp;</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="comment">/* nonlinear = a * linear - b */</span></div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keywordflow">if</span> (linear < params[1]) {</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  temp = linear * params[0];</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  }</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  temp = final_piece[0] * linear + final_piece[1];</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  }</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="keywordflow">return</span> temp;</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  }</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> }</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  </div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> fe_warp_piecewise_linear_print(<span class="keyword">const</span> <span class="keywordtype">char</span> *label)</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span> {</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  uint32 i;</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> </div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <span class="keywordflow">for</span> (i = 0; i < N_PARAM; i++) {</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  printf(<span class="stringliteral">"%s[%04u]: %6.3f "</span>, label, i, params[i]);</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  }</div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  printf(<span class="stringliteral">"\n"</span>);</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span> }</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  </div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> <span class="comment"> * Log record. Maintained by RCS.</span></div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span> <span class="comment"> * $Log: fe_warp_piecewise_linear.c,v $</span></div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> <span class="comment"> * Revision 1.2 2006/02/17 00:31:34 egouvea</span></div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span> <span class="comment"> * Removed switch -melwarp. Changed the default for window length to</span></div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span> <span class="comment"> * 0.025625 from 0.256 (so that a window at 16kHz sampling rate has</span></div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span> <span class="comment"> * exactly 410 samples). Cleaned up include's. Replaced some E_FATAL()</span></div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span> <span class="comment"> * with E_WARN() and return.</span></div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span> <span class="comment"> * Revision 1.1 2006/02/16 00:18:26 egouvea</span></div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span> <span class="comment"> * Implemented flexible warping function. The user can specify at run</span></div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span> <span class="comment"> * time which of several shapes they want to use. Currently implemented</span></div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span> <span class="comment"> * are an affine function (y = ax + b), an inverse linear (y = a/x) and a</span></div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span> <span class="comment"> * piecewise linear (y = ax, up to a frequency F, and then it "breaks" so</span></div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span> <span class="comment"> * Nyquist frequency matches in both scales.</span></div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span> <span class="comment"> * Added two switches, -warp_type and -warp_params. The first specifies</span></div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span> <span class="comment"> * the type, which valid values:</span></div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span> <span class="comment"> * -inverse or inverse_linear</span></div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span> <span class="comment"> * -linear or affine</span></div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span> <span class="comment"> * -piecewise or piecewise_linear</span></div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span> <span class="comment"> * The inverse_linear is the same as implemented by EHT. The -mel_warp</span></div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span> <span class="comment"> * switch was kept for compatibility (maybe remove it in the</span></div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> <span class="comment"> * future?). The code is compatible with EHT's changes: cepstra created</span></div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span> <span class="comment"> * from code after his changes should be the same as now. Scripts that</span></div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span> <span class="comment"> * worked with his changes should work now without changes. Tested a few</span></div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span> <span class="comment"> * cases, same results.</span></div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span> <span class="comment"> */</span></div>
<div class="ttc" id="strfuncs_8h_html"><div class="ttname"><a href="strfuncs_8h.html">strfuncs.h</a></div><div class="ttdoc">Miscellaneous useful string functions. </div></div>
<div class="ttc" id="err_8h_html_ac3c705943d946708cea0a1443be1c853"><div class="ttname"><a href="err_8h.html#ac3c705943d946708cea0a1443be1c853">E_INFO</a></div><div class="ttdeci">#define E_INFO</div><div class="ttdoc">Print logging information to standard error stream. </div><div class="ttdef"><b>Definition:</b> <a href="err_8h_source.html#l00147">err.h:147</a></div></div>
<div class="ttc" id="err_8h_html_a6a794bec721b555ac1f2167f9e12f662"><div class="ttname"><a href="err_8h.html#a6a794bec721b555ac1f2167f9e12f662">E_WARN</a></div><div class="ttdeci">#define E_WARN</div><div class="ttdoc">Print warning information to standard error stream. </div><div class="ttdef"><b>Definition:</b> <a href="err_8h_source.html#l00164">err.h:164</a></div></div>
<div class="ttc" id="strfuncs_8h_html_ab708351fe7308551632a782bfad75a1e"><div class="ttname"><a href="strfuncs_8h.html#ab708351fe7308551632a782bfad75a1e">atof_c</a></div><div class="ttdeci">SPHINXBASE_EXPORT double atof_c(char const *str)</div><div class="ttdoc">Locale independent version of atof(). </div><div class="ttdef"><b>Definition:</b> <a href="strfuncs_8c_source.html#l00056">strfuncs.c:56</a></div></div>
<div class="ttc" id="err_8h_html"><div class="ttname"><a href="err_8h.html">err.h</a></div><div class="ttdoc">Implementation of logging routines. </div></div>
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