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What is Demodulation?

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What is Demodulation?

(a) Process of varying one or more properties of a periodic waveform

(b) Recovering information from a modulated signal

(c) Process of mixing a signal with a sinusoid to produce a new signal

(d) Involvement of noise

I had been asked this question during an interview for a job.

The origin of the question is Source of Information in portion Elements of Communication System of Analog Communications

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The correct choice is (b) Recovering information from a modulated signal

Easy explanation: Demodulation is the process of recovering information from a modulated carrier wave while it is modulation in which properties of a periodic waveform is varied. A modulator is a device that performs modulation while the demodulator performs demodulation. A modem can perform both functions.

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