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What refers to the band of frequencies of the original signal?

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in Physics – Class 12 by (135k points)
What refers to the band of frequencies of the original signal?

(a) Range

(b) Broadband

(c) Bandwidth

(d) Baseband

This question was addressed to me by my college director while I was bunking the class.

I would like to ask this question from Basic Terminology Used in Electronic Communication Systems topic in portion Communication Systems of Physics – Class 12

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Right choice is (d) Baseband

The explanation is: The term baseband refers to the band of frequencies of the original signal, i.e. a signal that is not changed by the modulation, as is produced by the source of information. For example, an audio signal may have a baseband range from 20 to 20,000 hertz.

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