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<refentry id="median">
<indexterm id="IndexMedian"><primary>median</primary></indexterm>
<refentryinfo><title>Signal Modifiers:Standard Filters:Low Pass</title></refentryinfo>
<refmeta>
<refentrytitle>median</refentrytitle>
</refmeta>
<refnamediv>
<refname>median</refname>
<refpurpose>
A median filter, a variant FIR lowpass filter.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
Implementation of a median filter.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>ares <command>median</command> asig, ksize, imaxsize [, iskip]</synopsis>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>imaxsize</emphasis> -- the maximun size of the window used to
select the data.
</para>
<para>
<emphasis>iskip</emphasis> -- 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.
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
<emphasis>asig</emphasis> -- input signal to be filtered
</para>
<para>
<emphasis>ksize</emphasis> -- 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.
</para>
<para>
<emphasis>median</emphasis> is a simple filter that retuns the
median value of the last <emphasis>ksize</emphasis> values. It
has a lowpass action. The efficiency decreases as the window
size increases.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Here is an example of the median opcode. It uses the file <ulink url="examples/median.csd"><citetitle>median.csd</citetitle></ulink>.
<example>
<title>Example of the median opcode.</title>
<para>See the sections <link linkend="UsingRealTime"><citetitle>Real-time Audio</citetitle></link> and <link linkend="CommandFlags"><citetitle>Command Line Flags</citetitle></link> for more information on using command line flags.</para>
<xi:include href="examples-xml/median.csd.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</example>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>
<simplelist>
<member>Author: &namejohn;</member>
<member>University of Bath</member>
<member>May 2010</member>
</simplelist>
</para>
<para>New in Csound version 5.13</para>
</refsect1>
</refentry>
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