On factored FIR approximation of IIR filters

Abstract

We present a simple algorithm for the factored polynomial (Finite Impulse Response, FIR) approximation of rational (Infinite Impulse Response, IIR) filters which may be used to construct inverse filters. When applied to quadrature mirror filters, our approach yields a simple way of generating an efficient FIR filter bank which inherits the properties of IIR filter bank with any desired accuracy. © 1995 Academic Press, Inc.