<?xml version="1.0" encoding="UTF-8"?>

<!--
 *
 * This help file was generated from pei_tseng_notch.sci using help_from_sci().
 *
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<refentry version="5.0-subset Scilab" xml:id="pei_tseng_notch" xml:lang="en"
          xmlns="http://docbook.org/ns/docbook"
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          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>