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What is the reason of “envelope” in an amplitude modulated signal?

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What is the reason of “envelope” in an amplitude modulated signal?

(a) noise signal

(b) carrier signal

(c) nematic signal

(d) baseband signal

I got this question in examination.

I need to ask this question from Demodulation of VSB Modulated Wave in chapter VSB Modulation of Analog Communications

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Right choice is (d) baseband signal

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

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