1
<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
2
<!DOCTYPE MAN SYSTEM "../../manrev.dtd">
4
<LANGUAGE>eng</LANGUAGE>
6
<TYPE>Scilab Function</TYPE>
7
<DATE>April 1993</DATE>
8
<SHORT_DESCRIPTION name="zpbutt"> Butterworth analog filter</SHORT_DESCRIPTION>
10
<CALLING_SEQUENCE_ITEM>[pols,gain]=zpbutt(n,omegac) </CALLING_SEQUENCE_ITEM>
15
<PARAM_NAME>n</PARAM_NAME>
17
<SP>: integer (filter order)</SP>
21
<PARAM_NAME>omegac</PARAM_NAME>
23
<SP>: real (cut-off frequency in Hertz)</SP>
27
<PARAM_NAME>pols</PARAM_NAME>
29
<SP>: resulting poles of filter</SP>
33
<PARAM_NAME>gain</PARAM_NAME>
35
<SP>: resulting gain of filter</SP>
42
computes the poles of a Butterworth analog
43
filter of order <VERB>n</VERB> and cutoff frequency omegac
44
transfer function H(s) is calculated by <VERB>H(s)=gain/real(poly(pols,'s'))
47
<AUTHOR>F. Delebecque INRIA</AUTHOR>