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getCQT.m
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<title>/getCQT.m - Constant-Q Transform Toolbox - Sound Software .ac.uk</title>
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<div class="autoscroll">
<table class="filecontent syntaxhl">
<tbody>
<tr id="L1">
<th class="line-num">
<a href="#L1">1</a>
</th>
<td class="line-code">
<pre>function intCQT = getCQT(Xcqt,fSlice,tSlice,iFlag)
</pre>
</td>
</tr>
<tr id="L2">
<th class="line-num">
<a href="#L2">2</a>
</th>
<td class="line-code">
<pre>%outCQ = getCQT(Xcqt,fSlice,tSlice,iFlag) computes a rasterized representation of
</pre>
</td>
</tr>
<tr id="L3">
<th class="line-num">
<a href="#L3">3</a>
</th>
<td class="line-code">
<pre>%the amplitudes of the calculated CQT coefficients for the frequency bins definded in vector fSlice and the
</pre>
</td>
</tr>
<tr id="L4">
<th class="line-num">
<a href="#L4">4</a>
</th>
<td class="line-code">
<pre>%points in time (time frames) defined in vector tSlice using the interpolation method defined in iFlag.
</pre>
</td>
</tr>
<tr id="L5">
<th class="line-num">
<a href="#L5">5</a>
</th>
<td class="line-code">
<pre>%Valid values for iFlag are:
</pre>
</td>
</tr>
<tr id="L6">
<th class="line-num">
<a href="#L6">6</a>
</th>
<td class="line-code">
<pre>%
</pre>
</td>
</tr>
<tr id="L7">
<th class="line-num">
<a href="#L7">7</a>
</th>
<td class="line-code">
<pre>%'linear' ... linear interpolation (default)
</pre>
</td>
</tr>
<tr id="L8">
<th class="line-num">
<a href="#L8">8</a>
</th>
<td class="line-code">
<pre>%'spline' ... spline interpolation
</pre>
</td>
</tr>
<tr id="L9">
<th class="line-num">
<a href="#L9">9</a>
</th>
<td class="line-code">
<pre>%'nearest' ... nearest neighbor interpolation
</pre>
</td>
</tr>
<tr id="L10">
<th class="line-num">
<a href="#L10">10</a>
</th>
<td class="line-code">
<pre>%'cubic' ... piecewise cubic interpolation
</pre>
</td>
</tr>
<tr id="L11">
<th class="line-num">
<a href="#L11">11</a>
</th>
<td class="line-code">
<pre>%
</pre>
</td>
</tr>
<tr id="L12">
<th class="line-num">
<a href="#L12">12</a>
</th>
<td class="line-code">
<pre>%If the entire CQT representation should be rasterized, set fSlice and
</pre>
</td>
</tr>
<tr id="L13">
<th class="line-num">
<a href="#L13">13</a>
</th>
<td class="line-code">
<pre>%tSlice to 'all'.
</pre>
</td>
</tr>
<tr id="L14">
<th class="line-num">
<a href="#L14">14</a>
</th>
<td class="line-code">
<pre>%The input parameter Xcqt is the structure gained using cqt(...).
</pre>
</td>
</tr>
<tr id="L15">
<th class="line-num">
<a href="#L15">15</a>
</th>
<td class="line-code">
<pre>%The output parameter 'intCQT' is the same size as Xcqt.spCQT but is no
</pre>
</td>
</tr>
<tr id="L16">
<th class="line-num">
<a href="#L16">16</a>
</th>
<td class="line-code">
<pre>%longer sparse since the zeros between two coefficients are replaced by
</pre>
</td>
</tr>
<tr id="L17">
<th class="line-num">
<a href="#L17">17</a>
</th>
<td class="line-code">
<pre>%the interpolated values. The coefficients stored in 'intCQT' are now
</pre>
</td>
</tr>
<tr id="L18">
<th class="line-num">
<a href="#L18">18</a>
</th>
<td class="line-code">
<pre>%real-valued since only the absolute values of the coefficients are
</pre>
</td>
</tr>
<tr id="L19">
<th class="line-num">
<a href="#L19">19</a>
</th>
<td class="line-code">
<pre>%interpolated. If a spectrogram-like (rasterized) version of the CQT
</pre>
</td>
</tr>
<tr id="L20">
<th class="line-num">
<a href="#L20">20</a>
</th>
<td class="line-code">
<pre>%coefficients including phase information is required, use the function
</pre>
</td>
</tr>
<tr id="L21">
<th class="line-num">
<a href="#L21">21</a>
</th>
<td class="line-code">
<pre>%cqtPerfectRast() (see documentation for further information)
</pre>
</td>
</tr>
<tr id="L22">
<th class="line-num">
<a href="#L22">22</a>
</th>
<td class="line-code">
<pre>%
</pre>
</td>
</tr>
<tr id="L23">
<th class="line-num">
<a href="#L23">23</a>
</th>
<td class="line-code">
<pre>%Christian Sch?rkhuber, Anssi Klapuri 2010-06
</pre>
</td>
</tr>
<tr id="L24">
<th class="line-num">
<a href="#L24">24</a>
</th>
<td class="line-code">
<pre>
</pre>
</td>
</tr>
<tr id="L25">
<th class="line-num">
<a href="#L25">25</a>
</th>
<td class="line-code">
<pre>
</pre>
</td>
</tr>
<tr id="L26">
<th class="line-num">
<a href="#L26">26</a>
</th>
<td class="line-code">
<pre>if ischar(fSlice), fSlice = 1:(Xcqt.bins*Xcqt.octaveNr); end;
</pre>
</td>
</tr>
<tr id="L27">
<th class="line-num">
<a href="#L27">27</a>
</th>
<td class="line-code">
<pre>if ischar(tSlice)
</pre>
</td>
</tr>
<tr id="L28">
<th class="line-num">
<a href="#L28">28</a>
</th>
<td class="line-code">
<pre> lastEnt = find(Xcqt.spCQT(1,:),1,'last');
</pre>
</td>
</tr>
<tr id="L29">
<th class="line-num">
<a href="#L29">29</a>
</th>
<td class="line-code">
<pre> tSlice = 1:lastEnt;
</pre>
</td>
</tr>
<tr id="L30">
<th class="line-num">
<a href="#L30">30</a>
</th>
<td class="line-code">
<pre>end
</pre>
</td>
</tr>
<tr id="L31">
<th class="line-num">
<a href="#L31">31</a>
</th>
<td class="line-code">
<pre>if nargin < 4, iFlag = 'linear'; end;
</pre>
</td>
</tr>
<tr id="L32">
<th class="line-num">
<a href="#L32">32</a>
</th>
<td class="line-code">
<pre>
</pre>
</td>
</tr>
<tr id="L33">
<th class="line-num">
<a href="#L33">33</a>
</th>
<td class="line-code">
<pre>intCQT = zeros(length(fSlice),length(tSlice));
</pre>
</td>
</tr>
<tr id="L34">
<th class="line-num">
<a href="#L34">34</a>
</th>
<td class="line-code">
<pre>bins = Xcqt.bins;
</pre>
</td>
</tr>
<tr id="L35">
<th class="line-num">
<a href="#L35">35</a>
</th>
<td class="line-code">
<pre>spCQT = Xcqt.spCQT;
</pre>
</td>
</tr>
<tr id="L36">
<th class="line-num">
<a href="#L36">36</a>
</th>
<td class="line-code">
<pre>octaveNr = Xcqt.octaveNr;
</pre>
</td>
</tr>
<tr id="L37">
<th class="line-num">
<a href="#L37">37</a>
</th>
<td class="line-code">
<pre>spCQT = spCQT.';
</pre>
</td>
</tr>
<tr id="L38">
<th class="line-num">
<a href="#L38">38</a>
</th>
<td class="line-code">
<pre>
</pre>
</td>
</tr>
<tr id="L39">
<th class="line-num">
<a href="#L39">39</a>
</th>
<td class="line-code">
<pre>for k=1:length(fSlice)
</pre>
</td>
</tr>
<tr id="L40">
<th class="line-num">
<a href="#L40">40</a>
</th>
<td class="line-code">
<pre> oct = octaveNr-floor((fSlice(k)-0.1)/bins);
</pre>
</td>
</tr>
<tr id="L41">
<th class="line-num">
<a href="#L41">41</a>
</th>
<td class="line-code">
<pre> stepVec = 1:2^(oct-1):size(spCQT,1);
</pre>
</td>
</tr>
<tr id="L42">
<th class="line-num">
<a href="#L42">42</a>
</th>
<td class="line-code">
<pre> Xbin = full(spCQT(stepVec,fSlice(k)));
</pre>
</td>
</tr>
<tr id="L43">
<th class="line-num">
<a href="#L43">43</a>
</th>
<td class="line-code">
<pre> intCQT(k,:) = interp1(stepVec,abs(Xbin),tSlice,iFlag);
</pre>
</td>
</tr>
<tr id="L44">
<th class="line-num">
<a href="#L44">44</a>
</th>
<td class="line-code">
<pre>end
</pre>
</td>
</tr>
<tr id="L45">
<th class="line-num">
<a href="#L45">45</a>
</th>
<td class="line-code">
<pre>
</pre>
</td>
</tr>
<tr id="L46">
<th class="line-num">
<a href="#L46">46</a>
</th>
<td class="line-code">
<pre>
</pre>
</td>
</tr>
<tr id="L47">
<th class="line-num">
<a href="#L47">47</a>
</th>
<td class="line-code">
<pre>
</pre>
</td>
</tr>
</tbody>
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