Question: A discrete-time causal LTI system has the system function. (a) Is the system stable? (b) Find expressions for a minimum-phase system H 1 (z) and

A discrete-time causal LTI system has the system function.

(1 + 0.2z¬')(1 – 92-2) (1 + 0.81z-2) H(2) =

(a) Is the system stable?

(b) Find expressions for a minimum-phase system H1(z) and an all-pass system Hap(z) 

such that 

H(z) = H1(z) Hap(z).

(1 + 0.2z')(1 92-2) (1 + 0.81z-2) H(2) =

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