Hello there,

Can anybody provide me answer for this question.

Suggest a potential application for Bessel low pass filter, briefly outlining its relative merits compared with other filter designs.

Thanks in advance

 

(Have you got some exams coming up???)

In the analog world, there are basically 4 types of multi-pole filters available: Butterworth, Bessel, Chebyshev and Elliptic.

These filters can be characterised by their abilities in 3 key parameters: passband amplitude response, passband phase response and rate of rolloff.

Butterworth is used when you need a really flat amplitude response in the passband.

Bessel is used when you need a linear phase response in the passband.

Chebyshev and Elliptic are used when you need a steep rolloff.

So Bessel, with its linear phase response, is especially good at preserving waveshape, and an application that springs to mind is when you need to "clean up" a pulse train (eg. a digital signal) in the presence of high-frequency noise.