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Discussion :: Signals and Systems

  1. which one is discrete time periodic signal?

  2. A.
    sin 3pn
    B.
    cos 2pn
    C.
    sin 3pn
    D.
    all

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    Answer : Option C

    Explanation :

    In Discrete time signal irrational function cannot be periodic, frequency must be rational.

    Hence only (c) is periodic.

    sin 3pn = sin 3p(n + N) ⇒ for Periodic 3pN = 2Kp

    .


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