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Which of the following is done to convert a continuous time signal into discrete time signal?

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Which of the following is done to convert a continuous time signal into discrete time signal?

(a) Modulating

(b) Sampling

(c) Differentiating

(d) Integrating

I have been asked this question during an online exam.

This intriguing question comes from Classification of Signals in portion DSP – Basic Signaling of Digital Signal Processing

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The correct answer is (b) Sampling

For explanation I would say: A discrete time signal can be obtained from a continuous time signal by replacing t by nT, where T is the reciprocal of the sampling rate or time interval between the adjacent values. This procedure is known as sampling.

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