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Signals and Systems - Engineering

Q1:

If transfer function of a system is H(z) = 6 + z-1 + z-2 then system is

A minimun phase

B maximum phase

C mixed phase

D none

ANS:A - minimun phase

H(z) = 6 + z-1 - z-2, solve it by considering H(z) = 0 z = 1/3, -1/2 in H(z) only numerator. Hence z = 1/3, - 1/2 will be zero, and if zero lies inside the unit circle, system will be of minimum phase.