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The information signal is otherwise referred to as ___________

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The information signal is otherwise referred to as ___________

(a) Digital signal

(b) Analog signal

(c) Baseband signal

(d) Broadband signal

I have been asked this question during an online interview.

Query is from Modulation and Multiplexing in chapter Introduction to Electronic Communication of Avionics

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Correct option is (c) Baseband signal

For explanation I would say: The information signal, regardless of analog or digital type, is referred to as baseband signals. It could be voice, video or digital data and is modulated before transmission. In some case, baseband signals can be transmitted without modulation.

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