Notch filter for an interpolator/decimator filter structure

Details Notch filter for an interpolator/decimator filter structure Notch filter for an interpolator/decimator filter structure

H - Electricity

03

H

328/0.5

H03H 17/04 (2006.01) H03H 17/02 (2006.01)

Patent

CA 1269723

ABSTRACT A NOTCH FILTER FOR AN INTERPOLATOR/DECIMATOR FILTER STRUCTURE A filter structure including a notch filter (C) designed to have a transmission zero at a frequency slightly displaced from one half of the lower sampling rate of the interpolator/decimator, and thus providing increase in attenuation at the half-rate frequency. The notch filter (C) is comprised of two like all- pass-network filters (31 and 33) and has feed forward and feedback connections (39 and 41), the latter connection (41) including a coefficient multiplier (43). The feedback connection (41) is made between a tapped output (T) of the second of the network filters, filter (33) and an input node (35). The tapped filter,(33) is characterised by throughput and a tapped output transform functions X(Z) and Y(Z) given by the following expressions:- X(Z) = [Z-1 - K]/ [1 - KZ-1]; and, Y(Z) = .alpha. Z-1/ [1 - KZ-1]; where Z-1 is the unit delay operator, K the multiplier coefficient and, .alpha. , a structure dependant constant.

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