GATE EE 2015 Set 2 — Question 39
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Signals & Systems → Fourier Analysis & Sampling → CTFT & DTFT
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Question
Consider a signal defined byIts Fourier Transform is
Correct answer
(A) (2 sin(ω - 10))/(ω - 10)
Solution
The signal can be expressed as the product of a complex exponential and a rectangular pulse:where for and otherwise.The Fourier Transform of a rectangular pulse is:According to the frequency shifting property of the Fourier Transform:Here, . Thus:This corresponds to option (A).
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