Oversampled cosine modulated filter banks with linear phase

Authors

Helmut Bölcskei and Franz Hlawatsch

Reference

Proc. of IEEE International Symposium on Circuits and Systems (ISCAS), Hong Kong, Vol. 1, pp. 357-360, June 1997

DOI: 10.1109/ISCAS.1997.608741

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Abstract

We introduce oversampled cosine modulated filter banks (CMFBs) and a new classification of (oversampled or critically sampled) CMFBs as odd-stacked and even-stacked. We propose the new class of even-stacked CMFBs which allows both perfect reconstruction (PR) and linear phase filters in all channels. We formulate conditions for PR and show that any PR CMFB corresponds to a PR DFT filter bank with twice the oversampling factor. We also show that the frame-theoretic properties of a CMFB and of the corresponding DFT filter bank are closely related.

Keywords

Filter banks, oversampling, cosine modulation, linear phase filters, frame theory


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