Figure P5.16 plots the continuous-phase arg[H(ejω)] for the frequency response of a specific LTI system, where
for |ω| < π and α is a positive integer.
Is the impulse response h[n] of this system a causal sequence? If the system is definitely causal, or if it is definitely not causal, give a proof. If the causality of the system cannot be determined from Figure P5.16, give examples of a noncausal sequence and a causal sequence that both have the foregoing phase response arg[H(ejω)]
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