da148cd8f00311346e9808d57294d520996ef3e7
[scilab.git] / scilab / modules / signal_processing / help / en_US / zpch2.xml
1 <?xml version="1.0" encoding="UTF-8"?>
2 <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="zpch2">
3   <refnamediv>
4     <refname>zpch2</refname>
5     <refpurpose> Chebyshev analog filter</refpurpose>
6   </refnamediv>
7   <refsynopsisdiv>
8     <title>Calling Sequence</title>
9     <synopsis>[zeros,poles,gain]=zpch2(n,A,omegar)</synopsis>
10   </refsynopsisdiv>
11   <refsection>
12     <title>Arguments</title>
13     <variablelist>
14       <varlistentry>
15         <term>n</term>
16         <listitem>
17           <para>integer : filter order</para>
18         </listitem>
19       </varlistentry>
20       <varlistentry>
21         <term>A</term>
22         <listitem>
23           <para>
24             real : attenuation in stop band (<literal>A&gt;1</literal>)
25           </para>
26         </listitem>
27       </varlistentry>
28       <varlistentry>
29         <term>omegar</term>
30         <listitem>
31           <para>real : cut-off frequency in Hertz</para>
32         </listitem>
33       </varlistentry>
34       <varlistentry>
35         <term>zeros</term>
36         <listitem>
37           <para>resulting filter zeros</para>
38         </listitem>
39       </varlistentry>
40       <varlistentry>
41         <term>poles</term>
42         <listitem>
43           <para>resulting filter poles</para>
44         </listitem>
45       </varlistentry>
46       <varlistentry>
47         <term>gain</term>
48         <listitem>
49           <para>Resulting filter gain</para>
50         </listitem>
51       </varlistentry>
52     </variablelist>
53   </refsection>
54   <refsection>
55     <title>Description</title>
56     <para>
57       Poles and zeros of a type 2 Chebyshev analog filter
58       gain is the gain of the filter
59     </para>
60     <programlisting role=""><![CDATA[ 
61 H(s)=gain*poly(zeros,'s')/poly(poles,'s')
62  ]]></programlisting>
63   </refsection>
64 </refentry>