Oversampled cosine modulated filter banks with linear phase


Helmut Bölcskei and Franz Hlawatsch


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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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.


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

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