Bessel low pass filter

Discussion in 'General Electronics Chat' started by jeni4vijay, Aug 6, 2011.

  1. jeni4vijay

    Thread Starter New Member

    Jun 24, 2011
    13
    0
    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
     
  2. Hi-Z

    Member

    Jul 31, 2011
    157
    17
    (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.
     
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