Q: What role does a modulator play in a communication system?
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A
It converts digital signals to analog signals
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B
It amplifies signals
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C
It filters noise from signals
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D
It combines multiple signals into one
A
Answer:
A
Explanation:
A modulator in a communication system converts digital signals into analog signals for transmission over various communication channels, such as radio waves or optical fibers. Modulation involves varying a carrier signal's properties—such as amplitude, frequency, or phase—according to the input digital signal. This process allows efficient transmission of data over long distances and through different mediums. Modulators are essential in radio broadcasting, television transmission, and digital communication systems, ensuring that digital information can be transmitted and received accurately.
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