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<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from filtfilt.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="filtfilt" xml:lang="en"
xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns:ns3="http://www.w3.org/1999/xhtml"
xmlns:mml="http://www.w3.org/1998/Math/MathML"
xmlns:scilab="http://www.scilab.org"
xmlns:db="http://docbook.org/ns/docbook">
<refnamediv>
<refname>filtfilt</refname>
<refpurpose> Zero phase digital filtering </refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
[y]=filtfilt(b,a,x)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry><term>b:</term>
<listitem><para> Real or complex valued vector or matrix</para></listitem></varlistentry>
<varlistentry><term>a:</term>
<listitem><para> Real or complex valued vector or matrix</para></listitem></varlistentry>
<varlistentry><term>x:</term>
<listitem><para> Real or complex valued vector or matrix</para></listitem></varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
This is an Octave function
In theory, it forwards and reverse filters the signal and corrects phase distortion upto an extent by a one-pass filter but squares the magnitude response in the process. Practically though, the correction isn't perfect and magnitude response, particularly the stop band is distorted.
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
1. [a]=filtfilt (1,2i,[i -4 0])
//Expected output
//a = [-0.25i 1 0]
]]></programlisting>
</refsection>
</refentry>
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