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<div class="refentry" title="pvsbandp">
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<h2>
<span class="refentrytitle">pvsbandp</span>
</h2>
<p>pvsbandp —
A band pass filter working in the spectral domain.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp38173680"></a>
<h2>Description</h2>
<p>
Filter the pvoc frames, passing bins whose frequency is within a
band, and with linear interpolation for transitional bands.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp38174424"></a>
<h2>Syntax</h2>
<pre class="synopsis">fsig <span class="command"><strong>pvsbandp</strong></span> fsigin, xlowcut, xlowfull, \
xhighfull, xhighcut[, ktype]</pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp38184920"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>fsig</em></span> -- output pv stream
</p>
<p>
<span class="emphasis"><em>fsigin</em></span> -- input pv stream.
</p>
<p>
<span class="emphasis"><em>xlowcut, xlowfull, xhighfull, xhighcut</em></span> --
define a trapezium shape for the band that is passed. The a-rate
versions only apply to the sliding case.
</p>
<p>
<span class="emphasis"><em>ktype</em></span> -- specifies the shape of the
transitional band. If at the default value of zero the shape is
as below, with linear transition in amplitude. Other values
yield and exponential shape:
</p>
<div class="literallayout">
<p><br />
(1 - exp( r*type )) / (1 - exp(type))<br />
</p>
</div>
<p>
This includes a linear dB shape when <span class="emphasis"><em>ktype</em></span> is
<span class="emphasis"><em>log</em></span>(10) or about 2.30.
</p>
<p>
The opcode performs a band-pass filter with a spectral envelope
shaped like
</p>
<div class="literallayout">
<p><br />
klowfull __________________________ khighfull<br />
/ \<br />
/ \<br />
/ \<br />
/ \<br />
/ \<br />
________/ \______________<br />
klowcut khighcut<br />
</p>
</div>
<p>
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp38227848"></a>
<h2>Examples</h2>
<p>
Here is an example of the pvsbandp opcode. It uses the file <a class="ulink" href="examples/pvsbandp.csd" target="_top"><em class="citetitle">pvsbandp.csd</em></a>.
</p>
<div class="example">
<a id="idp38228832"></a>
<p class="title">
<strong>Example 638. Example of the pvsbandp 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>
<span class="comment">; Select audio/midi flags here according to platform</span>
<span class="comment">; Audio out Audio in</span>
-odac <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o pvsbandp.wav -W ;;; for file output any platform</span>
<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>
<span class="oblock">instr</span> 1
Sfile <span class="op">=</span> "fox.wav"
klowcut <span class="op">=</span> 100
klowfull <span class="op">=</span> 200
khighfull <span class="op">=</span> 1900
khighcut <span class="op">=</span> 2000
ain <span class="opc">soundin</span> Sfile
fftin <span class="opc">pvsanal</span> ain, 1024, 256, 1024, 1<span class="comment">; fft-analysis of the audio-signal</span>
fftbp <span class="opc">pvsbandp</span> fftin, klowcut, klowfull, khighfull, khighcut <span class="comment">; band pass</span>
abp <span class="opc">pvsynth</span> fftbp<span class="comment">; resynthesis</span>
<span class="opc">out</span> abp
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 3
<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="idp38231112"></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="pvsbandr.html" title="pvsbandr"><em class="citetitle">pvsbandr</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp38233568"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: John ffitch</td>
</tr>
<tr>
<td>December 2007 </td>
</tr>
</table>
<p>
</p>
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