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).