What happens to the amplitude of the modulating signal when amplitude modulation (AM) is applied?
Correct answer: C. Varies in accordance with the message signal
- A. Decreases
- B. Increases
- C. Varies in accordance with the message signal
- D. Remains constant
Explanation
The correct answer is (C) Varies in accordance with the message signal. In amplitude modulation, the information from the message signal (like audio or video) is carried by variations in the amplitude of the carrier signal. The amplitude of the carrier signal essentially piggybacks on the message signal to transmit information. When the amplitude of the message signal increases, the amplitude of the carrier signal also increases proportionally. Conversely, when the message signal decreases in amplitude, the carrier signal's amplitude decreases as well. In essence, the amplitude of the carrier signal becomes a replica of the modulating signal's amplitude variations, allowing the information to be transmitted and later recovered at the receiver side.
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