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The process of converting a continuous analog signal to a discrete digital signal is called?

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The process of converting a continuous analog signal to a discrete digital signal is called?

(a) Discretisation

(b) Sampling

(c) Preemphasis

(d) Reduction

I had been asked this question in an interview for internship.

My query is from Data Conversion in chapter Digital Communication Techniques of Avionics

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Right choice is (b) Sampling

The best I can explain: An analog signal is continuous and hence contains an infinite number of points. The process in which this continuous signal is discretized is called as sampling. The sampling period determines the accuracy of conversion.

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