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Discussion :: Signals and Systems

  1. Which one is a causal system?

    2. A.
    y(n) = 3x[n] - 2x[n - 1]
    B.
    y(n) = 3x[n] + 2x[n + 1]
    C.
    y(n) = 3x[n + 1] + 2x[n - 1]
    D.
    y(n) = 3x[n + 1] 2x[n - 1] + x[n]

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    Answer : Option A

    Explanation :

    For causal output must depend upon Present and past not on future.

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