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<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from ellip.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="ellip" 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>ellip</refname>
<refpurpose>Elliptic/Cauer filter design with rp dB of passband ripple and rs dB of stopband attenuation.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
[b, a] = ellip (n, rp, rs, wp)
[b, a] = ellip (n, rp, rs, wp, "high")
[b, a] = ellip (n, rp, rs, [wl, wh])
[b, a] = ellip (n, rp, rs, [wl, wh], "stop")
[z, p, g] = ellip (…)
[…] = ellip (…, "s")
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry><term>n:</term>
<listitem><para> positive integer value (order of filter)</para></listitem></varlistentry>
<varlistentry><term>rp:</term>
<listitem><para> non negative scalar value (passband ripple)</para></listitem></varlistentry>
<varlistentry><term>rs:</term>
<listitem><para> non negative scalar value (stopband attenuation)</para></listitem></varlistentry>
<varlistentry><term>ws:</term>
<listitem><para> scalar or vector of length 2, all elements should be in the range [0,1]</para><para> 1).Normalised digital passband edge(s) for digital filter, in the range [0, 1] {dimensionless}</para><para> 2).Analog passband edge(s) for analog filter, in the range [0, Inf] {rad/sec}</para></listitem></varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
This function generates an elliptic or Cauer filter with rp dB of passband ripple and rs dB of stopband attenuation.</para>
<para>[b, a] = ellip(n, Rp, Rs, Wp) indicates low pass filter with order n, Rp decibels of ripple in the passband and a stopband Rs decibels down and cutoff of pi*Wp radians. If the fifth argument is high, then the filter is a high pass filter.</para>
<para>[b, a] = ellip(n, Rp, Rs, [Wl, Wh]) indictaes band pass filter with band pass edges pi*Wl and pi*Wh. If the fifth argument is stop, the filter is a band reject filter.</para>
<para>[b,a] = ellip(n, Rp, Rs, [Wl, Wh], 'stop') band reject filter with edges pi*Wl and pi*Wh</para>
<para>[z, p, g] = ellip(...) returns filter as zero-pole-gain.</para>
<para>[...] = ellip(...,’s’) returns a Laplace space filter, wp can be larger than 1 rad/sec.
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
n = 2;
rp = 3;
rs = 40;
wp = [0.3 0.4];
[b, a]=ellip(n, rp, rs, wp)
]]></programlisting>
</refsection>
</refentry>
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