Sunday, 23 April 2017

Butterworth LPF and HPF design

In this experiment a scilab code was developed to design a digital butterworth filter by accepting the following specifications
  • Pass band attenuation(Ap<3dB)
  • Pass band frequency(Fp in Hz)
  • Stop band attenuation(As>40dB)
  • Stop band frequency(Fs in Hz)
  • Sampling frequency(Fs in Hz)
The analog filter was first designed using the input specifications. After designing the analog filter, digital was designed using BLT method. The values of Ap and As were verified from the obtained magnitude response. It was also observed that the magnitude response had a smooth monotonous curve.
The poles zero plot of analog and digital filter was also plotted. It was observed that for LPF the analog filter poles were on the LHS of the imaginary axis whereas the digital filter poles were on the RHS of the imaginary axis
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6 comments:

  1. Unknown25 April 2017 at 22:54

    Butterworth has no ripple in pass band

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  2. $oM€$h26 April 2017 at 00:24

    Butterworth has no ripples and hence, can be used in applications which require constant magnitude throughout the pass band!

    ReplyDelete
  3. shrinish_00126 April 2017 at 02:53

    It is referred to as maximally flat magnitude filter.The falloff rate is determined by the number of poles of the Filter

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  4. Student26 April 2017 at 07:56

    Well explained

    ReplyDelete
  5. Unknown26 April 2017 at 09:11

    Awesome stuff... now I don't have any doubt related to this topic...

    ReplyDelete
  6. Unknown26 April 2017 at 09:35

    Nice explanation

    ReplyDelete

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