Amplitude Modulation

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In AM, carrier amplitude varies proportional to:

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Carrier phase

Modulating signal

Carrier frequency

Receiver design

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Subject: physics
Chapter: communication systems
Topic: amplitude modulation
Difficulty: Easy
Year: 2025

Solution

Correct Answer:

Modulating signal

In Amplitude Modulation (AM), the instantaneous amplitude of the carrier wave is varied in accordance with the instantaneous amplitude of the modulating (message) signal. If the carrier is $C (t) = A_{c} sin (ω_{c} t)$ and message is $m (t)$ , the AM wave is: $x_{A M} (t) = [A_{c} + m (t)] sin (ω_{c} t)$ . The 'envelope' of the resulting wave follows the shape of the modulating signal.

This easy difficulty physics question is from the chapter communication systems, covering the topic of amplitude modulation. It appeared in the 2025 exam.

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Amplitude Modulation

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