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Frequency-domain magnitude constraints for oversampling complex-modulated NPR filter bank system design ensuring prescribed signal-to-distortion ratio

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2 Author(s)
Alfsmann, D. ; Digital Signal Process. Group, Ruhr-Univ. Bochum, Bochum, Germany ; Gockler, H.G.

Design approaches for oversampling complex-modulated analysis-synthesis filter bank systems (FBSs) have to control multirate disturbances due to down- and upsampling. Common design methods minimise multirate disturbances by optimising an objective function for arbitrarily given filter lengths. In contrast, approximate frequency-domain magnitude constraints are derived for FBS prototype filters such that a prescribed signal-to-distortion ratio of the FBS output signal is ensured. It is shown that these constraints can be met both by linear-phase equiripple and dedicated FBS filter design algorithms. Without the need of occupying the objective function of a (constrained) filter optimisation to minimise FBS disturbance, the resulting performance is close to that achieved with a current design method.

Published in:

Electronics Letters  (Volume:46 ,  Issue: 3 )