MCQ- When the lower sideband components of the Double Sideband (DSB) signal whose spectrum is given in the figure are suppressed with a filter, when the signal obtained by suppressing it with a filter is multiplied by cos(ωct) in the time domain, which of the following signals is the

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter15: Alternating Current
Section: Chapter Questions
Problem 4RQ: 4. What is frequency?
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When the lower sideband components of the Double Sideband (DSB) signal whose spectrum is given in the figure are suppressed with a filter, when the signal obtained by suppressing it with a filter is multiplied by cos(ωct) in the time domain, which of the following signals is the result?

a) 0.5 cos(2ωc + ωm)t + cosωct

b) 0.25 cos(2ωc - ωm)t – 0.5 cosωct

c) 0.5 cos(2ωc - ωm)t + 0.25 cosωct

d) 0.5 cos(2ωc + ωm)t + 0.5 cosωct

SDSB (J )
4...
-f. - fm-f. -f + fm
f.- fm fe fc+ fm
|
Transcribed Image Text:SDSB (J ) 4... -f. - fm-f. -f + fm f.- fm fe fc+ fm |
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