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<h2>
<span class="refentrytitle">pvsblur</span>
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<p>pvsblur —
Average the amp/freq time functions of each analysis channel for
a specified time.
</p>
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<div class="refsect1" title="Description">
<a id="idp38313120"></a>
<h2>Description</h2>
<p>
Average the amp/freq time functions of each analysis channel for
a specified time (truncated to number of frames). As a side-effect
the input pvoc stream will be delayed by that amount.
</p>
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<div class="refsect1" title="Syntax">
<a id="idp38313912"></a>
<h2>Syntax</h2>
<pre class="synopsis">fsig <span class="command"><strong>pvsblur</strong></span> fsigin, kblurtime, imaxdel</pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp38315000"></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>kblurtime</em></span> -- time in secs during which
windows will be averaged .
</p>
<p>
<span class="emphasis"><em>imaxdel</em></span> -- maximum delay time, used for
allocating memory used in the averaging operation.
</p>
<p>
This opcode will blur a pvstream by smoothing the amplitude and
frequency time functions (a type of low-pass filtering); the
amount of blur will depend on the length of the averaging period,
larger blurtimes will result in a more pronounced effect.
</p>
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<th align="left">Warning</th>
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<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>
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<div class="refsect1" title="Examples">
<a id="idp38318344"></a>
<h2>Examples</h2>
<p>
Here is an example of the use of the <span class="emphasis"><em>pvsblur</em></span> opcode. It uses the file <a class="ulink" href="examples/pvsblur.csd" target="_top"><em class="citetitle">pvsblur.csd</em></a>.
</p>
<div class="example">
<a id="idp38319544"></a>
<p class="title">
<strong>Example 641. Example of the <span class="emphasis"><em>pvsblur</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>
<span class="oblock">instr</span> 1
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>
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>
fftblur <span class="opc">pvsblur</span> fftin, p4, 1<span class="comment">; blur</span>
aout <span class="opc">pvsynth</span> fftblur<span class="comment">; resynthesis</span>
<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 3 0
<span class="stamnt">i</span> 1 3 3 .1
<span class="stamnt">i</span> 1 6 3 .5
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
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<p><br class="example-break" />
</p>
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<div class="refsect1" title="See Also">
<a id="idp38322032"></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="idp38324008"></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>
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<p>
</p>
<p>New plugin in version 5</p>
<p>November 2004.</p>
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