iirgroup(1)

NAME
iirgroup - group delay Lp IIR filter optimization

CALLING SEQUENCE
[lt,grad]=iirgroup(p,r,theta,omega,wt,td)
[cout,grad,ind]=iirlp(x,ind,p,[flag],lambda,omega,ad,wa,td,wt)

PARAMETERS

r   : vector of the module of the poles and the zeros of the filters

theta
    : vector of the argument of the poles and the zeros of the filters

omega
    : frequencies where the filter specifications are given

wt  : weighting function for and the group delay

td  : desired group delay

lt, grad
    : criterium and gradient values

DESCRIPTION
optimization of IIR filters for the Lp criterium for the the group delay. (Rabiner & Gold pp270-273).