A causal LTI system has the system function
(a) Write the difference equation that is satisfied by the input x[n] and output y[n] of this system.
(b) Plot the pole–zero diagram and indicate the ROC for the system function.
(c) Make a carefully labeled sketch of |H(ejω)| . Use the pole–zero locations to explain why the frequency response looks as it does.
(d) State whether the following are true or false about the system:
(i) The system is stable.
(ii) The impulse response approaches a nonzero constant for large n.
(iii) Because the system function has a pole at angle π/3, the magnitude of the frequency response has a peak at approximately ω = π/3.
(iv) The system is a minimum-phase system.
(v) The system has a causal and stable inverse.
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