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<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from qp_kaiser.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="qp_kaiser" 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>qp_kaiser</refname>
<refpurpose>Computes a finite impulse response (FIR) filter for use with a quasi-perfect reconstruction polyphase-network filter bank.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
qp_kaiser (nb, at, linear)
qp_kaiser (nb, at)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry><term>nb:</term>
<listitem><para> Number of bands</para></listitem></varlistentry>
<varlistentry><term>at:</term>
<listitem><para> Attenuation</para></listitem></varlistentry>
<varlistentry><term>linear:</term>
<listitem><para> When not zero, minimum-phase calculation is omitted.</para></listitem></varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
This is an Octave function.
This version utilizes a Kaiser window to shape the frequency response of the designed filter. Tha number nb of bands and the desired attenuation at in the stop-band are given as parameters.
</para>
<para>
The Kaiser window is multiplied by the ideal impulse response h(n)=a.sinc(a.n) and converted to its minimum-phase version by means of a Hilbert transform.
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
qp_kaiser (5, 5, 1)
ans =
0.11591 0.25606 0.25606 0.25606 0.11591
]]></programlisting>
</refsection>
</refentry>
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