IIR filter design via Hankel-norm optimal approximation of FIRprototype filters: a streamlined approach

An improved algorithm for Hankel-norm optimal approximation of FIR by IIR discrete-time transfer functions is given which results in a straightforward and computationally efficient implementation which is less error-prone than previous approaches     

FIR filter order reduction: balanced model truncation andHankel-norm optimal approximation

Two different algorithms for approximating FIR by IIR filters are treated: truncation of the balanced model and the Hankel-norm optimal approximation. Both are assessed for approximation fidelity, as well as for intrinsic computational efficiency. Examples show surprisingly good relative performance of the balanced model truncation, suggesting that frequently this method will be operationally preferable