iirlp - Lp IIR filter optimization

Calling Sequence

[cost,grad,ind]=iirlp(x,ind,p,[flag],lambda,omega,ad,wa,td,wt)

Parameters

• x : 1X2 vector of the module and argument of the poles and the zeros of the filters
• flag : string : 'a' for amplitude, 'gd' for group delay; default case for amplitude and group delay.
• omega : frequencies where the filter specifications are given
• wa,wt : weighting functions for the amplitude and the group delay
• lambda : weighting (with 1-lambda) of the costs ('a' and 'gd' for getting the global cost.
• ad, td : desired amplitude and group delay
• cost, grad : criterium and gradient values

Description

optimization of IIR filters for the Lp criterium for the amplitude and/or the group delay. (Rabiner & Gold pp270-273).