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A Bessel rational filter

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3 Author(s)

An extension of the Bessel filter is given for which the transfer function is a rational function with finite zeros. A special case is shown to combine the constant magnitude response of the all-pass filter with the linear phase response of the Bessel filter. A design example for a second-order all-pass constant time delay filter is given; there is good agreement with theory.

Published in:

IEEE Transactions on Circuits and Systems  (Volume:21 ,  Issue: 6 )