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Electronics and Communication Engineering

GATE ECE concept:amplitude-modulation PYQs

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How to practice concept:amplitude-modulation

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GATE ECE syllabus

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Question 28

Open question
ECMSQ1 markNeeds review
Consider a message signal

which is bandlimited to

, where

is in Hz. Consider the following two modulation schemes for the message signal:
• Double sideband-suppressed carrier (DSB-SC):

• Amplitude modulation (AM):

Here,

and

are the amplitude and frequency (in Hz) of the carrier, respectively. In the case of AM,

denotes the modulation index.
Consider the following statements: (i) An envelope detector can be used for demodulation in the DSB-SC scheme if

for all

. (ii) An envelope detector can be used for demodulation in the AM scheme only if

for all

.
Which of the following options is/are correct?
Your answerSelect all correct options. You can choose more than one.

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