1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from pei_tseng_notch.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="pei_tseng_notch" 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>pei_tseng_notch</refname>
<refpurpose></refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
[b, a] = pei_tseng_notch (frequencies, bandwidths)
b = pei_tseng_notch (frequencies, bandwidths)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry><term>frequencies:</term>
<listitem><para> filter frequencies</para></listitem></varlistentry>
<varlistentry><term>bandwidths:</term>
<listitem><para> bandwidths to be used with filter</para></listitem></varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
This is an Octave function.
It return coefficients for an IIR notch-filter with one or more filter frequencies and according bandwidths. The filter is based on a all pass filter that performs phasereversal at filter frequencies.
This leads to removal of those frequencies of the original and phase-distorted signal.
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
sf = 800; sf2 = sf/2;
data=[[1;zeros(sf-1,1)],sinetone(49,sf,1,1),sinetone(50,sf,1,1),sinetone(51,sf,1,1)];
[b,a]=pei_tseng_notch ( 50 / sf2, 2/sf2 )
b =
0.99213 -1.83322 0.99213
a =
1.00000 -1.83322 0.98426
]]></programlisting>
</refsection>
</refentry>
|
