A new class of linear-phase FIR filters based on switching and resetting of IIR filters

A class of linear-phase FIR lters was originally introduced by the last two authors of this article. Their proposed structure approximated the transfer function of G(z)G(z^-1), where G(z) was the transfer function of a Stable IIR lter. The approximation to G(z)G(z-^-1) was essentially a truncation of its impulse response performed by a feed forward part, followed by a shift to make it implementable. This paper introduces a new approximation to G(z)G(z^-1), based on an alternative truncation scheme, and discusses its advantages over the original design.