Fast design of relatively wide band fractional delay all-pass filters
Signal Processing
Journal of Signal Processing Systems
Reconstruction of N-th order nonuniformly sampled bandlimited signals using digital filter banks
Digital Signal Processing
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Non-optimal FIR filters used for fractional-sample delay, despite their wideband nature, are shown to benefit significantly from application of windowing. Here simple raised-cosine windows prove to be very effective, particularly if they are cast as asymmetric modifications of their conventional forms. The offset von Hann window is surprisingly potent when the number of coefficients is large and window offset coincides with the fractional delay required of the overall filter.