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<div class="refentry" title="pvsfilter">
<a id="pvsfilter"></a>
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<a id="IndexPvsfilter" class="indexterm"></a>
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<h2>
<span class="refentrytitle">pvsfilter</span>
</h2>
<p>pvsfilter —
Multiply amplitudes of a pvoc stream by those of a second
pvoc stream, with dynamic scaling.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp38602320"></a>
<h2>Description</h2>
<p>
Multiply amplitudes of a pvoc stream by those of a second
pvoc stream, with dynamic scaling.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp38603024"></a>
<h2>Syntax</h2>
<pre class="synopsis">fsig <span class="command"><strong>pvsfilter</strong></span> fsigin, fsigfil, kdepth[, igain]</pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp38611280"></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>fsigfil</em></span> -- filtering pvoc stream.
</p>
<p>
<span class="emphasis"><em>kdepth</em></span> -- controls the depth of filtering
of fsigin by fsigfil .
</p>
<p>
<span class="emphasis"><em>igain</em></span> -- amplitude scaling (optional, defaults to 1).
</p>
<p>
Here the input pvoc stream amplitudes are modified by the
filtering stream, keeping its frequencies intact. As usual, both
signals have to be in the same format.
</p>
<div class="warning" title="Warning" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Warning">
<tr>
<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Warning]" src="images/warning.png" />
</td>
<th align="left">Warning</th>
</tr>
<tr>
<td align="left" valign="top">
<p>
It is unsafe to use the same f-variable for both input and output of pvs opcodes. Using the same one might lead to undefined behavior on some opcodes. Use a different one on the left and right sides of the opcode.
</p>
</td>
</tr>
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</div>
<div class="refsect1" title="Examples">
<a id="idp38614912"></a>
<h2>Examples</h2>
<p>
</p>
<div class="example">
<a id="idp38615376"></a>
<p class="title">
<strong>Example 652. Example</strong>
</p>
<div class="example-contents">
<pre class="programlisting">
kfreq <span class="opc">expon</span> 500, p3, 4000 <span class="comment">; 3-octave sweep</span>
kdepth <span class="opc">linseg</span> 1, p3/2, 0.5, p3/2, 1 <span class="comment">; varying filter depth</span>
asig <span class="opc">in</span> <span class="comment">; input</span>
afil <span class="opc">oscili</span> 1, kfreq, 1 <span class="comment">; filter t-domain signal</span>
fim <span class="opc">pvsanal</span> asig,1024,256,1024,0 <span class="comment">; pvoc analysis</span>
fil <span class="opc">pvsanal</span> afil,1024,256,1024,0
fou <span class="opc">pvsfilter</span> fim, fil, kdepth <span class="comment">; filter signal</span>
aout <span class="opc">pvsynth</span> fou <span class="comment">; pvoc synthesis</span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
<p>
In the example above the filter curve will depend on the
spectral envelope of afil; in the simple case of a sinusoid,
it will be equivalent to a narrowband band-pass filter.</p>
<p>
Here is an example of the use of the <span class="emphasis"><em>pvsfilter</em></span> opcode. It uses the file <a class="ulink" href="examples/pvsfilter.csd" target="_top"><em class="citetitle">pvsfilter.csd</em></a>.
</p>
<div class="example">
<a id="idp38685144"></a>
<p class="title">
<strong>Example 653. Example of the <span class="emphasis"><em>pvsfilter</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
giBell <span class="ohdr">ftgen</span> 0, 0, 4096, 9, .56, 1, 0, .57, .67, 0, .92, 1.8, 0, .93, 1.8, 0, 1.19, 2.67, 0, 1.7, 1.67, 0, 2, 1.46, 0, 2.74, 1.33, 0, 3, 1.33, 0, 3.76, 1, 0, 4.07, 1.33, 0<span class="comment">; bell-like (after Risset)</span>
<span class="oblock">instr</span> 1
ipermut <span class="op">=</span> p4<span class="comment">; 1 = change order of soundfiles </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>
Sfile1 <span class="op">=</span> "fox.wav"
ain1 <span class="opc">soundin</span> Sfile1
kfreq <span class="opc">randomi</span> 200, 300, 3
ain2 <span class="opc">oscili</span> .2, kfreq, giBell
<span class="comment">;ain2 oscili .2, kfreq, giSine; try also this </span>
fftin1 <span class="opc">pvsanal</span> ain1, ifftsize, ioverlap, iwinsize, iwinshape<span class="comment">; fft-analysis of file 1</span>
fftin2 <span class="opc">pvsanal</span> ain2, ifftsize, ioverlap, iwinsize, iwinshape<span class="comment">; fft-analysis of file 2</span>
<span class="octrl">if</span> ipermut <span class="op">==</span> 1 then
fcross <span class="opc">pvsfilter</span> fftin2, fftin1, 1
<span class="octrl">else</span>
fcross <span class="opc">pvsfilter</span> fftin1, fftin2, 1
<span class="octrl">endif</span>
aout <span class="opc">pvsynth</span> fcross
<span class="opc">out</span> aout <span class="op">*</span> 20
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 2.757 0<span class="comment">; frequencies from fox.wav, amplitudes multiplied by amplitudes of giBell</span>
<span class="stamnt">i</span> 1 3 2.757 1<span class="comment">; frequencies from giBell, amplitudes multiplied by amplitudes of fox.wav</span>
<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="idp38687632"></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>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp38689608"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Victor Lazzarini</td>
</tr>
<tr>
<td>November 2004 </td>
</tr>
</table>
<p>
</p>
<p>New plugin in version 5</p>
<p>November 2004.</p>
</div>
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