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electronics and communication engineering signals and systems
1. which one is discrete time periodic signal?
(A): all
(B): cos 2 p n
(C): sin 3 p n
(D): sin 3p n
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By: guest on 02 Jun 2017 01.13 am
In Discrete time signal irrational function cannot be periodic, frequency must be rational. Hence only (c) is periodic. sin 3p n = sin 3p (n + N) ⇒ for Periodic 3p N = 2Kp .
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