The system function H(z) of a causal linear time-invariant system has the pole-zero configuration shown in Figure,

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The system function H(z) of a causal linear time-invariant system has the pole-zero configuration shown in Figure, It is also known that H(z) = 6 when z = 1. 

Im z-plane Double zero Re 2 wi-

(a) Determine H(z).

(b) Determine the impulse response h[n] of the system.

(c) Determine the response of the system to the following input signals:

(i) x[n] = u[n] – ½ u[n – 1]

(ii) The sequence x[n] obtained from sampling the continuous-time signal

x(t) = 50 +10 cos 20πt + 30 cos 40πt

at a sampling frequency Ωs = 2π(40) rad/s

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Discrete Time Signal Processing

ISBN: 978-0137549207

2nd Edition

Authors: Alan V. Oppenheim, Rolan W. Schafer

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