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Signals and Systems by Smarajit Ghosh

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12.10 NOTCH FILTER

A filter which contains one or more notches or ideally perfect nulls in its frequency response characteristics is known as a notch filter. The frequency response characteristics of a notch filter is shown in Fig. 12.36 having two null frequency ω0 and ω1 Amplitudes are zero at null frequency.

 

Frequency response characteristic of a notch filter

 

Fig. 12.36 Frequency response characteristic of a notch filter

 

These filters are useful for eliminating some specific frequency components. These filters are used in instrumentation and recording system to eliminate the harmonics. A pair of complex-conjugate zeros on unit circle is introduced for inserting a null in the frequency ...

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