Fast Implementation of Oversampled Modulated Filter Banks

Oversampled Cosine Modulated Filter Banks With Perfect Reconstruction - Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on

Oversampled filter banks (FB’s) offer more design freedom and better noise immunity than critically sampled FB’s. Due to the increased computational complexity caused by oversampling, oversampled FB’s allowing an efficient implementation, such as cosine modulated filter banks (CMFB’s), are of particular interest. So far, only critically sampled CMFB’s have been considered. In this paper, we int...

Oversampled cosine-modulated filter banks with arbitrary system delay

In this paper, design methods for perfect reconstruction (PR) oversampled cosine-modulated filter banks with integer oversampling factors and arbitrary delay are presented. The system delay, which is an important parameter in realtime applications, can be chosen independently of the prototype lengths. Oversampling gives us additional freedom in the filter design process, which can be exploited ...

Fast Implementation of Oversampled Modulated Filter

Design of paraunitary oversampled cosine-modulated filter banks

In this paper we derive perfect reconstruction (PR) conditions for oversampled cosine-modulated lter banks. The results can be regarded as a generalization of the known work for critical subsampling. We show that in the over-sampled case we gain some additional degree of freedom, which can be exploited in the lter design process. This leads to PR prototypes with stopband attenuations being much...

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 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 co...