12.11 COMB FILTER
It is the simplest form of a notch filter in which the nulls occur periodically across the frequency band. These filters are used for reduction of power line harmonics, suppression of clutter from fixed objects in Moving Target Indication (MTI) Radar. It has also a wide range of practical applications. Let us consider a moving average FIR filter which is a simple form of comb filter having the difference equation
The z-transform of Eq. (12.122) gives
To get frequency response characteristic of FIR filter, let us put ...
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