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<h2>
<span class="refentrytitle">median</span>
</h2>
<p>median —
A median filter, a variant FIR lowpass filter.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp30629056"></a>
<h2>Description</h2>
<p>
Implementation of a median filter.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp30656680"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>median</strong></span> asig, ksize, imaxsize [, iskip]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp30657784"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>imaxsize</em></span> -- the maximun size of the window used to
select the data.
</p>
<p>
<span class="emphasis"><em>iskip</em></span> -- initial
disposition of internal data space. A zero value will clear the
space; a non-zero value will allow previous information to
remain. The default value is 0.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp30659280"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig</em></span> -- input signal to be filtered
</p>
<p>
<span class="emphasis"><em>ksize</em></span> -- size of the window over which the
input is to be filtered. It must not exceed the maximum window
size; if it does it is truncated.
</p>
<p>
<span class="emphasis"><em>median</em></span> is a simple filter that retuns the
median value of the last <span class="emphasis"><em>ksize</em></span> values. It
has a lowpass action. The efficiency decreases as the window
size increases.
</p>
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<div class="refsect1" title="Examples">
<a id="idp30661480"></a>
<h2>Examples</h2>
<p>
Here is an example of the median opcode. It uses the file <a class="ulink" href="examples/median.csd" target="_top"><em class="citetitle">median.csd</em></a>.
</p>
<div class="example">
<a id="idp30662448"></a>
<p class="title">
<strong>Example 449. Example of the median 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"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 441
<span class="ohdr">ksmps</span> <span class="op">=</span> 100
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="oblock">instr</span> 1
a1 <span class="opc">oscil</span> 30000, 10, 1
a2 <span class="opc">median</span> a1, 5, 8
<span class="opc">out</span> a2
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span>1 0 4096 10 1
<span class="stamnt">i</span> 1 0 0.1
<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="Credits">
<a id="idp30664720"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: John ffitch</td>
</tr>
<tr>
<td>University of Bath</td>
</tr>
<tr>
<td>May 2010</td>
</tr>
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<p>
</p>
<p>New in Csound version 5.13</p>
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