Question: By trail-and-error design a third-order low pass filter with cutoff frequency at 0 = /9 radians/sample interval. Start your search with (a) z1 = z2

By trail-and-error design a third-order low pass filter with cutoff frequency at ω0 = π/9 radians/sample interval. Start your search with
(a) z1 = z2 = z3 = 0, p1 = r, p2.3 = re±jωk, r = 0.8
(b) r = 0.9, z1 = z2 = z3 = -1

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