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<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from cheby2.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="cheby2" 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>cheby2</refname>
<refpurpose>This function generates a Chebyshev type II filter with rs dB of stopband attenuation.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
[a, b] = cheby2 (n, rs, wc)
[a, b] = cheby2 (n, rs, wc, "high")
[a, b] = cheby2 (n, rs, [wl, wh])
[a, b] = cheby2 (n, rs, [wl, wh], "stop")
[a, b, c] = cheby2 (…)
[a, b, c, d] = cheby2 (…)
[…] = cheby2 (…, "s")
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry><term>n:</term>
<listitem><para> positive integer value</para></listitem></varlistentry>
<varlistentry><term>rp:</term>
<listitem><para> non negative scalar value</para></listitem></varlistentry>
<varlistentry><term>w:</term>
<listitem><para> vector, all elements must be in the range [0,1]</para></listitem></varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
This is an Octave function.
This function generates a Chebyshev type II filter with rs dB of stopband attenuation.
The fourth parameter takes in high or low, default value is low. The cutoff is pi*Wc radians.
[b, a] = cheby2(n, Rp, [Wl, Wh]) indicates a band pass filter with edges pi*Wl and pi*Wh radians.
[b, a] = cheby2(n, Rp, [Wl, Wh], ’stop’) indicates a band reject filter with edges pi*Wl and pi*Wh radians.
[z, p, g] = cheby2(...) returns filter as zero-pole-gain rather than coefficients of the numerator and denominator polynomials.
[...] = cheby2(...,’s’) returns a Laplace space filter, w can be larger than 1.
[a,b,c,d] = cheby2(...) returns state-space matrices.
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
[a,b,c]=cheby2(2,5,0.7,"high")
a =
-0.31645 - 0.94861i -0.31645 + 0.94861i
b =
-0.39388 + 0.53138i -0.39388 - 0.53138i
c = 0.47528
]]></programlisting>
</refsection>
</refentry>
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