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

A practical approach to optimal design of multichannel oversampled warped cosine-modulated filter banks (CMFB) is proposed. Warped CMFB is obtained by all- pass 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. Pro- posed optimization-based design considerably reduces distortions of overall filter bank transfer function taking into account channel subsampling ratios.