GATE EC 2014 Set 3 — Question 53

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NAT+2 / -0MediumPoles & ZerosLTI SystemsSignals & Systems

Signals & Systems → LTI Systems → Poles & Zeros

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Question

Let H1(z)=(1pz1)1H_1(z) = (1 - pz^{-1})^{-1}, H2(z)=(1qz1)1H_2(z) = (1 - qz^{-1})^{-1}, H(z)=H1(z)+rH2(z)H(z) = H_1(z) + r H_2(z). The quantities p,q,rp, q, r are real numbers. Consider p=12,q=14,r<1p = \frac{1}{2}, q = -\frac{1}{4}, |r| < 1. If the zero of H(z)H(z) lies on the unit circle, then r=________r = \_\_\_\_\_\_\_\_
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