Electronics and Communication Engineering - Exam Questions Papers - Discussion

20. 

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

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

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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