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<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from tf2sos.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="tf2sos" 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>tf2sos</refname>
<refpurpose>This function converts direct-form filter coefficients to series second-order sections.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
[sos] = tf2sos (b, a)
[sos, g] = tf2sos (b, a)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry><term>b:</term>
<listitem><para> matrix of real numbers</para></listitem></varlistentry>
<varlistentry><term>a:</term>
<listitem><para> matrix of real numbers</para></listitem></varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
This is an Octave function.
This function converts direct-form filter coefficients to series second-order sections.
The input parameters b and a are vectors specifying the digital filter H(z) = B(z)/A(z).
The output is the sos matrix and the overall gain.
If there is only one output argument, the overall filter gain is applied to the first second-order section in the sos matrix.
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
tf2sos([1,2,3,4,5,6],2)
ans =
0.50000 0.80579 1.07239 1.00000 0.00000 0.00000
1.00000 -1.10337 1.87524 1.00000 0.00000 0.00000
1.00000 1.49180 -0.00000 1.00000 0.00000 0.00000
]]></programlisting>
</refsection>
</refentry>
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