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<div id="projectname">OpenANN
 <span id="projectnumber">1.1.0</span>
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<div id="projectbrief">An open source library for artificial neural networks.</div>
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<div class="title">Decimator.h</div> </div>
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<a href="Decimator_8h.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="preprocessor">#ifndef DECIMATOR_H_</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="preprocessor"></span><span class="preprocessor">#define DECIMATOR_H_</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="preprocessor">#include <<a class="code" href="Preprocessing_8h.html" title="Provides some convenience functions to preprocess data. ">OpenANN/Preprocessing.h</a>></span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include <Eigen/Core></span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor">#include <cmath></span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> </div>
<div class="line"><a name="l00008"></a><span class="lineno"><a class="code" href="classDecimator.html"> 8</a></span> <span class="keyword">class </span><a class="code" href="classDecimator.html">Decimator</a></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> {</div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  <span class="keywordtype">int</span> downSamplingFactor;</div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>  Eigen::VectorXd a, b;</div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="keyword">public</span>:</div>
<div class="line"><a name="l00014"></a><span class="lineno"><a class="code" href="classDecimator.html#ac354a063f99167fab0799cae5de140f3"> 14</a></span>  <a class="code" href="classDecimator.html#ac354a063f99167fab0799cae5de140f3">Decimator</a>(<span class="keywordtype">int</span> downSamplingFactor)</div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  : downSamplingFactor(downSamplingFactor)</div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  {</div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  }</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div>
<div class="line"><a name="l00023"></a><span class="lineno"><a class="code" href="classDecimator.html#a5e7413b1533969d800ee9f864a69076c"> 23</a></span>  Eigen::MatrixXd <a class="code" href="classDecimator.html#a5e7413b1533969d800ee9f864a69076c" title="Downsample the signal by an integer factor, using a filter. ">decimate</a>(<span class="keyword">const</span> Eigen::MatrixXd& x)</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  {</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="comment">// Low pass filter</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="comment">// scipy:</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="comment">// signal.firwin(30+1, 10.0/fs, window='hamming')</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  Eigen::MatrixXd y1(x.rows(), x.cols());</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  Eigen::VectorXd b1(31);</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  b1 << 0.00256293, 0.0032317 , 0.00475108, 0.00727558, 0.01088579,</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  0.01557498, 0.02124304, 0.02769838, 0.03466804, 0.04181521,</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  0.04876293, 0.05512206, 0.06052093, 0.06463443, 0.06720971,</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  0.06808644, 0.06720971, 0.06463443, 0.06052093, 0.05512206,</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  0.04876293, 0.04181521, 0.03466804, 0.02769838, 0.02124304,</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  0.01557498, 0.01088579, 0.00727558, 0.00475108, 0.0032317 ,</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  0.00256293;</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  Eigen::VectorXd a1(1);</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  a1 << 1.;</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <a class="code" href="namespaceOpenANN.html#a228436e4d8bd87183760affe5f553304" title="Apply a (numerically stable) filter (FIR or IIR) on the input signal. ">OpenANN::filter</a>(x, y1, b1, a1);</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  Eigen::MatrixXd d(x.rows(), x.cols() / downSamplingFactor);</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <a class="code" href="namespaceOpenANN.html#ad119003b08d44d31752650ecbd29224b" title="Downsample an input signal. ">OpenANN::downsample</a>(y1, d, downSamplingFactor);</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">return</span> d;</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  }</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> };</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="preprocessor">#endif // DECIMATOR_H_</span></div>
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