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⟩ How to implement a fourth order Butterworth LP filter at 1kHz if sampling frequency is 8 kHz?

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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