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  1. If . dt, then F[y(t)] is

    2. A.
    - jsgn(f). x(f)
    B.
    j2pf . e-jptf . x(f)
    C.
    D.

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    Answer : Option A

    Explanation :

    ⇒ F{Y(t)} = Y(f) = X(f) x

    sin (t) ⇌

    By duality :⇌ sgn + (- f)

    ⇒ ⇌ jsgn (- f)

    ∴⇌ - j sgn (f)

    ∵ sgn(- f) = - sgn(f)

    ⇒ Y(f) = X(f). [- j sgn(f)].

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