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<h2>
<span class="refentrytitle">pvscent</span>
</h2>
<p>pvscent —
Calculate the spectral centroid of a signal.
</p>
</div>
<div class="refsect1">
<a id="idm281472899572232"></a>
<h2>Description</h2>
<p>
Calculate the spectral centroid of a signal from its discrete Fourier transform.
</p>
</div>
<div class="refsect1">
<a id="idm281472899528632"></a>
<h2>Syntax</h2>
<pre class="synopsis">kcent <span class="command"><strong>pvscent</strong></span> fsig</pre>
</div>
<div class="refsect1">
<a id="idm281472899526424"></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>
</div>
<div class="refsect1">
<a id="idm281472899523928"></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="idm281472899521624"></a>
<p class="title">
<strong>Example 750. 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>
<div class="refsect1">
<a id="idm281472720636632"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
-odac
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">16</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">1</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="c1">;; example written by joachim heintz 2009</span>
gi<span class="n">Sine</span> <span class="nb">ftgen</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">4096</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span>
i<span class="n">refrtm</span> <span class="o">=</span> <span class="nb">p4</span><span class="c1">; time for generating new values for the spectral centroid</span>
i<span class="n">fftsize</span> <span class="o">=</span> <span class="mi">1024</span>
i<span class="n">overlap</span> <span class="o">=</span> i<span class="n">fftsize</span> <span class="o">/</span> <span class="mi">4</span>
i<span class="n">winsize</span> <span class="o">=</span> i<span class="n">fftsize</span>
i<span class="n">winshape</span> <span class="o">=</span> <span class="mi">1</span><span class="c1">; von-Hann window</span>
<span class="c1">;Sfile = "flute-C-octave0.wav"</span>
S<span class="n">file</span> <span class="o">=</span> <span class="s">"fox.wav"</span>
a<span class="n">in</span> <span class="nb">soundin</span> S<span class="n">file</span>
<span class="n">fftin</span> <span class="nb">pvsanal</span> a<span class="n">in</span><span class="p">,</span> i<span class="n">fftsize</span><span class="p">,</span> i<span class="n">overlap</span><span class="p">,</span> i<span class="n">winsize</span><span class="p">,</span> i<span class="n">winshape</span><span class="c1">; fft-analysis of the audio-signal</span>
k<span class="n">trig</span> <span class="nb">metro</span> <span class="mi">1</span> <span class="o">/</span> i<span class="n">refrtm</span>
<span class="k">if</span> k<span class="n">trig</span> <span class="o">==</span> <span class="mi">1</span> <span class="k">then</span>
k<span class="n">center</span> <span class="nb">pvscent</span> <span class="n">fftin</span><span class="c1">; spectral center</span>
<span class="k">endif</span>
a<span class="n">out</span> <span class="nb">oscil</span> <span class="mf">.2</span><span class="p">,</span> k<span class="n">center</span><span class="p">,</span> gi<span class="n">Sine</span>
<span class="nb">out</span> a<span class="n">out</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mf">2.757</span> <span class="mf">.3</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">3</span> <span class="mf">2.757</span> <span class="mf">.05</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">6</span> <span class="mf">2.757</span> <span class="mf">.005</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">9</span> <span class="mf">2.757</span> <span class="mf">.001</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1">
<a id="idm281472899517000"></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">
<a id="idm281472899512072"></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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