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Reconstruction of signals after filtering and sampling rate reduction

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3 Author(s)
A. Fettweis ; Ruhr-Universität Bochum, West Germany ; J. Nossek ; K. Meerkotter

A wave digital filter (WDF) two-port has two input and two output terminals. By using these to appropriately connect a WDF to its transpose, the filtering effect is fully compensated except for an all-pass phase, and this independently of any selectivity requirement. This remains true if at the points of interconnection every second sample is reduced to zero, provided that a certain condition, easily to be satisfied exactly, is fulfilled. Very efficient solutions are then possible. The method is of interest e.g. for subband coding.

Published in:

Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '84.  (Volume:9 )

Date of Conference:

Mar 1984