<?xml version="1.0" encoding="UTF-8"?>
<refentry xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:svg="http://www.w3.org/2000/svg" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:db="http://docbook.org/ns/docbook" version="5.0-subset Scilab" xml:lang="en" xml:id="zpbutt">
- <refnamediv>
- <refname>zpbutt</refname>
- <refpurpose> Butterworth analog filter</refpurpose>
- </refnamediv>
- <refsynopsisdiv>
- <title>Calling Sequence</title>
- <synopsis>[pols,gain]=zpbutt(n,omegac)</synopsis>
- </refsynopsisdiv>
- <refsection>
- <title>Arguments</title>
- <variablelist>
- <varlistentry>
- <term>n</term>
- <listitem>
- <para>integer (filter order)</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>omegac</term>
- <listitem>
- <para>real (cut-off frequency in Hertz)</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>pols</term>
- <listitem>
- <para>resulting poles of filter</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>gain</term>
- <listitem>
- <para>resulting gain of filter</para>
- </listitem>
- </varlistentry>
- </variablelist>
- </refsection>
- <refsection>
- <title>Description</title>
- <para>
- computes the poles of a Butterworth analog
- filter of order <literal>n</literal> and cutoff frequency omegac
- transfer function H(s) is calculated by <literal>H(s)=gain/real(poly(pols,'s'))</literal>
- </para>
- </refsection>
+ <refnamediv>
+ <refname>zpbutt</refname>
+ <refpurpose> Butterworth analog filter</refpurpose>
+ </refnamediv>
+ <refsynopsisdiv>
+ <title>Calling Sequence</title>
+ <synopsis>[pols,gain]=zpbutt(n,omegac)</synopsis>
+ </refsynopsisdiv>
+ <refsection>
+ <title>Arguments</title>
+ <variablelist>
+ <varlistentry>
+ <term>n</term>
+ <listitem>
+ <para>integer (filter order)</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>omegac</term>
+ <listitem>
+ <para>real (cut-off frequency in Hertz)</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>pols</term>
+ <listitem>
+ <para>resulting poles of filter</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>gain</term>
+ <listitem>
+ <para>resulting gain of filter</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsection>
+ <refsection>
+ <title>Description</title>
+ <para>
+ computes the poles of a Butterworth analog
+ filter of order <literal>n</literal> and cutoff frequency omegac
+ transfer function H(s) is calculated by <literal>H(s)=gain/real(poly(pols,'s'))</literal>
+ </para>
+ </refsection>
+ <refsection>
+ <title>Examples</title>
+ <programlisting role="example"><![CDATA[
+n=7;
+omegac=3;
+[pols,gain]=zpbutt(n,omegac)
+ ]]></programlisting>
+ </refsection>
+
</refentry>