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The __________ of an AM signal resembles the shape of baseband signal.

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The __________ of an AM signal resembles the shape of baseband signal.

(a) upperband

(b) lowerband

(c) efficiency

(d) envelope

This question was addressed to me in an interview for internship.

Enquiry is from Spectrum of AM SC Waves topic in section Side Band Techniques of Analog Communications

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Correct choice is (d) envelope

Explanation: Envelope is basically a smooth curve that outlines the extremes of any baseband signal in the amplitude modulated wave. So basically it is message or baseband signal that determines the envelope.

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