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<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from islinphase.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="islinphase" 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>islinphase</refname>
<refpurpose>Checks given system function is linearphase or not</refpurpose>
<para> </para>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
flag = islinphase(b,a)
flag = islinphase(sos)
flag = islinphase(...,tol)
</synopsis>
<para> </para>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry><term>b</term>
<listitem><para> Coefficients of numerator polynomial of system function </para></listitem></varlistentry>
<varlistentry><term>a</term>
<listitem><para> Coefficients of denumerator polynomial of system function</para></listitem></varlistentry>
<varlistentry><term>sos</term>
<listitem><para> Second order section matrix of order Kx6 </para></listitem></varlistentry>
<varlistentry><term>tol</term>
<listitem><para> Tolerence in similarities between two numbers in phase response </para></listitem></varlistentry>
<varlistentry><term>flag</term>
<listitem><para> This function returns logical 1 if system is linear phase (flag = 1) </para> <para> Otherwise it returns logical 0 (flag = 0)</para></listitem></varlistentry>
</variablelist>
<para> </para>
</refsection>
<refsection>
<title>Description</title>
<para> This function takes input a System function in terms of numerator and denumerator coefficients or in second order section (sos) matrix and checks for system having Linear Phase Response or not </para>
<para> </para>
</refsection>
<refsection>
<title>Examples</title>
<para>Checking given system function is linear-phase or not</para>
<para>
<latex>
\begin{eqnarray}
H(z) = z^{-1} + 2 z^{-2} + 2 z^{-3} + z^{-4}
\end{eqnarray}
</latex>
</para>
<para> </para>
<programlisting role="example"><![CDATA[
b = [0 1 2 2 1 0] ; //Numerator polynomial coefficients
a = 1 ; //Denumerator polynomial coefficients
flag = islinphase(b,a) //This is an example of Symmetric FIR Filter which is Linear Phase, hence it will give output : flag = 1
]]></programlisting>
</refsection>
</refentry>
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