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<div class="refentry" title="pvscent">
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<h2>
<span class="refentrytitle">pvscent</span>
</h2>
<p>pvscent —
Calculate the spectral centroid of a signal.
</p>
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<div class="refsect1" title="Description">
<a id="idp38462032"></a>
<h2>Description</h2>
<p>
Calculate the spectral centroid of a signal from its discrete Fourier transform.
</p>
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<div class="refsect1" title="Syntax">
<a id="idp38462728"></a>
<h2>Syntax</h2>
<pre class="synopsis">kcent <span class="command"><strong>pvscent</strong></span> fsig</pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp38466064"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kcent</em></span> -- the spectral centroid
</p>
<p>
<span class="emphasis"><em>fsig</em></span> -- an input pv stream
</p>
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<div class="refsect1" title="Examples">
<a id="idp38467296"></a>
<h2>Examples</h2>
<p>
Here is an example of the use of the <span class="emphasis"><em>pvscent</em></span> opcode. It uses the file <a class="ulink" href="examples/pvscent.csd" target="_top"><em class="citetitle">pvscent.csd</em></a>.
</p>
<div class="example">
<a id="idp38468496"></a>
<p class="title">
<strong>Example 647. Example of the <span class="emphasis"><em>pvscent</em></span> opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
-odac
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 16
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="comment">;; example written by joachim heintz 2009</span>
giSine <span class="ohdr">ftgen</span> 0, 0, 4096, 10, 1
<span class="oblock">instr</span> 1
irefrtm <span class="op">=</span> p4<span class="comment">; time for generating new values for the spectral centroid</span>
ifftsize <span class="op">=</span> 1024
ioverlap <span class="op">=</span> ifftsize <span class="op">/</span> 4
iwinsize <span class="op">=</span> ifftsize
iwinshape <span class="op">=</span> 1<span class="comment">; von-Hann window</span>
<span class="comment">;Sfile = "flute-C-octave0.wav"</span>
Sfile <span class="op">=</span> "fox.wav"
ain <span class="opc">soundin</span> Sfile
fftin <span class="opc">pvsanal</span> ain, ifftsize, ioverlap, iwinsize, iwinshape<span class="comment">; fft-analysis of the audio-signal</span>
ktrig <span class="opc">metro</span> 1 <span class="op">/</span> irefrtm
<span class="octrl">if</span> ktrig <span class="op">==</span> 1 then
kcenter <span class="opc">pvscent</span> fftin<span class="comment">; spectral center</span>
<span class="octrl">endif</span>
aout <span class="opc">oscil</span> .2, kcenter, giSine
<span class="opc">out</span> aout
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 2.757 .3
<span class="stamnt">i</span> 1 3 2.757 .05
<span class="stamnt">i</span> 1 6 2.757 .005
<span class="stamnt">i</span> 1 9 2.757 .001
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp38520624"></a>
<h2>See Also</h2>
<p>
<a class="link" href="pvsanal.html" title="pvsanal"><em class="citetitle">pvsanal</em></a>,
<a class="link" href="pvsynth.html" title="pvsynth"><em class="citetitle">pvsynth</em></a>,
<a class="link" href="pvsadsyn.html" title="pvsadsyn"><em class="citetitle">pvsadsyn</em></a>,
<a class="link" href="pvspitch.html" title="pvspitch"><em class="citetitle">pvspitch</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp38523136"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: John ffitch;</td>
</tr>
<tr>
<td>March 2005</td>
</tr>
</table>
<p>
</p>
<p>New plugin in version 5</p>
<p>March 2005.</p>
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