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<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
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<!DOCTYPE MAN SYSTEM "../../manrev.dtd">
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<LANGUAGE>eng</LANGUAGE>
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<TITLE>iirgroup</TITLE>
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<TYPE>Scilab Function</TYPE>
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<DATE>April 1993</DATE>
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<SHORT_DESCRIPTION name="iirgroup"> group delay Lp IIR filter optimization</SHORT_DESCRIPTION>
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<CALLING_SEQUENCE_ITEM>[lt,grad]=iirgroup(p,r,theta,omega,wt,td) </CALLING_SEQUENCE_ITEM>
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<CALLING_SEQUENCE_ITEM>[cout,grad,ind]=iirlp(x,ind,p,[flag],lambda,omega,ad,wa,td,wt) </CALLING_SEQUENCE_ITEM>
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<PARAM_NAME>r</PARAM_NAME>
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<SP>: vector of the module of the poles and the zeros of the filters</SP>
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<PARAM_NAME>theta</PARAM_NAME>
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<SP>: vector of the argument of the poles and the zeros of the filters</SP>
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<PARAM_NAME>omega</PARAM_NAME>
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<SP>: frequencies where the filter specifications are given</SP>
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<PARAM_NAME>wt</PARAM_NAME>
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<SP>: weighting function for and the group delay</SP>
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<PARAM_NAME>td</PARAM_NAME>
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<SP>: desired group delay</SP>
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<PARAM_NAME>lt, grad</PARAM_NAME>
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<SP>: criterium and gradient values</SP>
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optimization of IIR filters for the Lp criterium for the
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the group delay. (Rabiner & Gold pp270-273).</P>