engleski

Design of Multirate Digital Filters Based on Sharpening Technique

Well-known sample rate converters employ the cascaded-integrator-comb (CIC) filter. However, its magnitude response often does not meet the requirement for selectivity. A popular technique for improving the response is sharpening. In this work, we describe methods for the design of sharpened CIC filters based on weighted least squares, weighted minimax, and almost equiripple error criterion. The features of the presented methods are illustrated with the design of narrowband and wideband filters. The filters presented are suitable for application in narrowband and wideband software radio receivers.

multirate digital filters; cascaded-integrator-comb filter; CIC; sharpening; almost equiripple

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