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DESIGN OF BUTTERWORTH FILTER

The aim of this experiment was designing analog and digital Butterworth filter.
We designed a digital filter from analog filter and studied the aliasing effect due to sampling in Impulse Invariant Method and the frequency warping effect in BLT Method.
The Input Specifications were given as
(1) Pass band Attenuation 
(2) Stop band Attenuation 
(3) Pass band Frequency
(4) Stop band Frequency 
(5) Sampling Frequency 
     
We arrived at a conclusion that for both low pass and high pass filter, poles lie inside the unit circle. Hence both the filters are stable. But we also observed in the result that the values of Ap and As are not approximately same. Hence for better stability the order of the filter needs to be increased.

Comments

  1. Chaitanya SApril 28, 2017 at 7:07 AM

    Butterworth filter is also called maximally flat magnitude filter

    ReplyDelete
  2. UnknownMay 1, 2017 at 9:30 PM

    For both low pass and high pass filters poles lie inside the unit circle

    ReplyDelete

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