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What do you understand by the term analog communication?

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What do you understand by the term analog communication?

(a) A method in which one of the properties of a carrier signal varies in proportion to an instantaneous value of modulation signal

(b) A way for data and computer communication

(c) A numerical coded communication

(d) A suitable method for long distance communication

This question was addressed to me during an online exam.

Asked question is from Source of Information topic in chapter Elements of Communication System of Analog Communications

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Correct choice is (a) A method in which one of the properties of a carrier signal varies in proportion to an instantaneous value of modulation signal

The best explanation: Analog communication means that information is transmitted in the form of a continuous signal through the process of modulation. Rests of the options are applicable for digital communication, where coding is applied.

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