How do you implement a fourth order Butterworth LP filter
at 1kHz if sampling frequency is 8 kHz?
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Answer / mani_drvsv
A fourth order Butterworth filter can be made as cascade of
two seond order LP filters with zeta of 0.924 and 0.383.
One can use a bilinear transformation approach for
realising second order LP filters. Using this technique
described well in many texts, one can make two second order
LP filters and cascade them.
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