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<a href="CircularPeakPicking_8hxx.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (c) 2001-2006 MUSIC TECHNOLOGY GROUP (MTG)</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * UNIVERSITAT POMPEU FABRA</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> *</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"> * This program is free software; you can redistribute it and/or modify</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * it under the terms of the GNU General Public License as published by</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * the Free Software Foundation; either version 2 of the License, or</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * (at your option) any later version.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * This program is distributed in the hope that it will be useful,</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * GNU General Public License for more details.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * You should have received a copy of the GNU General Public License</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * along with this program; if not, write to the Free Software</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#ifndef CircularPeakPicking_hxx</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor"></span><span class="preprocessor">#define CircularPeakPicking_hxx</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor"></span><span class="preprocessor">#include <list></span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include <vector></span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="keyword">namespace </span>Simac</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> {</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div>
<div class="line"><a name="l00045"></a><span class="lineno"><a class="code" href="classSimac_1_1CircularPeakPicking.html"> 45</a></span> <span class="keyword">class </span><a class="code" href="classSimac_1_1CircularPeakPicking.html" title="This processing takes a vector of scalars magnitudes and returns a list of peaks found considering th...">CircularPeakPicking</a></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> {</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="keyword">public</span>:</div>
<div class="line"><a name="l00048"></a><span class="lineno"><a class="code" href="classSimac_1_1CircularPeakPicking.html#afe33d4d9db82e2fa6d28b6e9a22f7980"> 48</a></span>  <span class="keyword">typedef</span> std::vector<std::pair<double, double> > <a class="code" href="classSimac_1_1CircularPeakPicking.html#afe33d4d9db82e2fa6d28b6e9a22f7980">PeakList</a>;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="keyword">private</span>:</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <a class="code" href="classSimac_1_1CircularPeakPicking.html#afe33d4d9db82e2fa6d28b6e9a22f7980">PeakList</a> _output;</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> _maxSize;</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordtype">double</span> _binSize;</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordtype">double</span> _offset;</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="keyword">public</span>:</div>
<div class="line"><a name="l00055"></a><span class="lineno"><a class="code" href="classSimac_1_1CircularPeakPicking.html#a56c8a3a1a86e8c9955b82e36f8f2739c"> 55</a></span>  <a class="code" href="classSimac_1_1CircularPeakPicking.html#a56c8a3a1a86e8c9955b82e36f8f2739c">CircularPeakPicking</a>(<span class="keywordtype">unsigned</span> chromagramSize, <span class="keywordtype">double</span> binSize=1.0, <span class="keywordtype">double</span> offset=0.0)</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  : _maxSize(chromagramSize), _binSize(binSize), _offset(offset)</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>  _output.reserve(chromagramSize);</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  }</div>
<div class="line"><a name="l00070"></a><span class="lineno"><a class="code" href="classSimac_1_1CircularPeakPicking.html#a10cc93bd77dcdb0c99e711dc57dc9510"> 70</a></span>  std::pair<double,double> <a class="code" href="classSimac_1_1CircularPeakPicking.html#a10cc93bd77dcdb0c99e711dc57dc9510" title="Find the maximum of an interpolated quadratic polynomial function giving the samples at three equidis...">interpolate</a>(<span class="keywordtype">double</span> y0, <span class="keywordtype">double</span> y1, <span class="keywordtype">double</span> y2)</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  {</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="comment">// From the quadratic lagrange interpolation</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="comment">// y= y0(x1-x)(x2-x)/(x1-x0)(x2-x0) +</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="comment">// + y1(x-x0)(x2-x)/(x1-x0)(x2-x0) +</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="comment">// + y1(x2-x)(x-x0)/(x2-x1)(x2-x0) +</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment">// + y2(x-x1)(x-x0)/(x2-x1)(x2-x0) =</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">// considering x0=0, x1=1 and x2=2</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="comment">// = y0(x-1)(x-2)/2 +</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="comment">// - y1(x)(x-2)/2 +</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="comment">// - y1(x-2)(x)/2 +</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="comment">// + y2(x-1)(x)/2 =</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="comment">// = y0(x-1)(x-2)/2 +</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="comment">// - y1(x-2)(x) +</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="comment">// + y2(x-1)(x)/2 =</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="comment">//</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="comment">// = y0/2 (x^2 - 3x + 2) - y1 (x^2-2x) + y2/2 (x^2-x)</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="comment">// = (y0/2-y1+y2/2) x^2 + (-3*y0/2 + 2*y1 - y2/2) x + y0</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordtype">double</span> a = y0/2 - y1 + y2/2;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordtype">double</span> b = y1 -y0 -a; <span class="comment">// = -3*y0/2 + 2*y1 -y2/2;</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordtype">double</span> c = y0;</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> </div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="comment">// From equating to zero the derivate of x*x*a + x*b + c </span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordtype">double</span> xmax = -b/(a*2);</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="comment">// ymax = xmax*xmax*a + b*xmax + c =</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="comment">// = a*b*b/(4*a*a) -b*b/(2*a) + c =</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="comment">// = b*b/(4*a) -b*b/(2*a) + c =</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="comment">// = -b*b/(4*a) + c</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordtype">double</span> ymax = b*xmax/2 + y0;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> </div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">return</span> std::make_pair(xmax, ymax);</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  }</div>
<div class="line"><a name="l00106"></a><span class="lineno"><a class="code" href="classSimac_1_1CircularPeakPicking.html#a951929321644ddca8d2f3b8c4467d6b8"> 106</a></span>  <span class="keywordtype">void</span> <a class="code" href="classSimac_1_1CircularPeakPicking.html#a951929321644ddca8d2f3b8c4467d6b8">doIt</a>(<span class="keyword">const</span> std::vector<double> & chromagram)</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  {</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  _output.resize(0);</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordtype">unsigned</span> i0=_maxSize-2;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordtype">unsigned</span> i1=_maxSize-1;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i=0; i<_maxSize; i0=i1, i1=i, i++)</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  {</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="comment">// not equal to support plain two bins peaks</span></div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordflow">if</span> (chromagram[i0] > chromagram[i1]) <span class="keywordflow">continue</span>;</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordflow">if</span> (chromagram[i ] >= chromagram[i1]) <span class="keywordflow">continue</span>;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> </div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  std::pair<double,double> interpoled=</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <a class="code" href="classSimac_1_1CircularPeakPicking.html#a10cc93bd77dcdb0c99e711dc57dc9510" title="Find the maximum of an interpolated quadratic polynomial function giving the samples at three equidis...">interpolate</a>(chromagram[i0],chromagram[i1],chromagram[i]);</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="comment">// Adding the base bin</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  interpoled.first+=i0;</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="comment">// Folding to [0,_maxSize) interval</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordflow">while</span> (interpoled.first<0) interpoled.first +=_maxSize;</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keywordflow">while</span> (interpoled.first>=_maxSize) interpoled.first -=_maxSize;</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="comment">// Scaling</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  interpoled.first*=_binSize;</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="comment">// Shifting to the first bin position</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  interpoled.first+=_offset;</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> </div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  _output.push_back(interpoled);</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  }</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  }</div>
<div class="line"><a name="l00132"></a><span class="lineno"><a class="code" href="classSimac_1_1CircularPeakPicking.html#a9ea6921360b95a9a94a7c4850c5f2e99"> 132</a></span>  <span class="keyword">const</span> <a class="code" href="classSimac_1_1CircularPeakPicking.html#afe33d4d9db82e2fa6d28b6e9a22f7980">PeakList</a> & <a class="code" href="classSimac_1_1CircularPeakPicking.html#a9ea6921360b95a9a94a7c4850c5f2e99">output</a>()<span class="keyword"> const</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="keyword"> </span>{</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keywordflow">return</span> _output;</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</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="comment">// namespace Simac</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> </div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="preprocessor">#endif// CircularPeakPicking_hxx</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="preprocessor"></span></div>
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