A Design of Paraunitary Polyphase Matrices of Rational Filter Banks Based on (P,Q) Shift-Invariant Systems

TL;DR

This paper introduces a method for designing paraunitary polyphase matrices for rational filter banks using (P,Q) shift-invariant systems, enabling flexible frequency spectrum splitting with minimized stopband energies.

Contribution

It presents a novel approach to design paraunitary polyphase matrices based on (P,Q) shift-invariant systems for rational filter banks, allowing arbitrary frequency splitting.

Findings

Achieves ideal frequency spectrum using (P,Q) shift-invariant systems.

Designs filters with minimized stopband energies.

Provides a systematic method for rational filter bank design.

Abstract

In this paper we present a method to design paraunitary polyphase matrices of critically sampled rational filter banks. The method is based on (P,Q) shift-invariant systems, and so any kind of rational splitting of the frequency spectrum can be achieved using this method. Ideal (P,Q) shift-invariant system with smallest P and Q that map of a band of input spectrum to the output spectrum are obtained. A new set of filters is obtained that characterize a (P,Q) shift-invariant system. Ideal frequency spectrum of these filters are obtained using ideal $(P,Q)$ shift-invariant systems. Actual paraunitary polyphase matrices are then obtained by minimizing the stopband energies of these filters against the parameters of the paraunitary polyphase matrices.