Practical design of multi-channel oversampled warped cosine-modulated filter banks

TL;DR

This paper presents a practical optimization-based method for designing oversampled warped cosine-modulated filter banks that effectively minimize amplitude distortion and aliasing, with a publicly available MATLAB implementation.

Contribution

It introduces a novel optimization approach for designing warped CMFBs that reduces distortions considering oversampling ratios, enhancing filter bank performance.

Findings

Significant reduction in amplitude distortion achieved.

Effective suppression of aliasing components.

Implementation available in MATLAB on GitHub.

Abstract

A practical approach to optimal design of multichannel oversampled warped cosine-modulated filter banks (CMFB) is proposed. Warped CMFB is obtained by allpass transformation of uniform CMFB. The paper addresses the problems of minimization amplitude distortion and suppression of aliasing components emerged due to oversampling of filter bank channel signals. Proposed optimization-based design considerably reduces distortions of overall filter bank transfer function taking into account channel subsampling ratios. Matlab-implementation of the proposed warped CMFB design method is available in public GitHub repository.