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Sharpening of the multistage modified comb filters

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Author(s): Nikolić Marko | Lutovac Miroslav

Journal: Serbian Journal of Electrical Engineering
ISSN 1451-4869

Volume: 8;
Issue: 3;
Start page: 281;
Date: 2011;
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Keywords: CIC filter | comb-based filter | filter sharpening | multirate systems | polyphase decomposition

ABSTRACT
This paper describes the application of filter sharpening method to the modified comb filter (MCF) in the case of decimation factor, which is product of two or more positive integers. It is shown that in the case of multistage decimation with MCF, filters in each stage are also MCF. Applying the sharpening to the decimation filter in the last stage provides very good results, with savings in the number of operations comparing to the case of sharpening of the complete filter. Direct-form FIR polyphase filter structure is proposed for the filters in each stage.
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