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What is Comb Corrector Filters

Encyclopedia of Information Science and Technology, Fourth Edition
The simple filters used to correct pass band droop and to increase attenuation in the folding bands of the comb filter.
Published in Chapter:
Methods for Simultaneous Improvement of Comb Pass Band and Folding Bands
Gordana Jovanovic Dolecek (Institute INAOE Puebla, Mexico)
Copyright: © 2018 |Pages: 13
DOI: 10.4018/978-1-5225-2255-3.ch536
This decimation introduces the replicas of the main signal spectrum. If the signal is not properly filtered, the overlapping of the repeated replicas of the original spectrum, called aliasing, may occur. The aliasing may destroy the useful information of the decimated signal and must be eliminated by the filter which precedes the decimation, called decimation filter. The most popular decimation filter is a comb filter, usually used in the first stage of decimation. However its magnitude characteristic is not flat in the pass band of interest and there is not enough attenuation in the folding bands. Different methods are proposed to improve comb magnitude characteristic. This article presents an overview of methods for simultaneous improvement of comb magnitude characteristic in both: pass band and folding bands. The methods are divided into three main groups: Sharpening-based methods, Corrector–based methods, and Methods based on the combination of alias rejection and compensator design methods.
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