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What is the process of digital communication where a threshold value is set at the receiver to reduce noise?

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What is the process of digital communication where a threshold value is set at the receiver to reduce noise?

(a) Signal threshold

(b) Data regeneration

(c) Signal regeneration

(d) Signal cut off

This question was addressed to me in an online interview.

The origin of the question is Digital Transmission of Data in division Digital Communication Techniques of Avionics

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Correct answer is (c) Signal regeneration

Explanation: In the process of signal regeneration a cut off value or threshold value is set in the receiver so that the noise can be clipped off. When the values are set properly only the binary data would pass through the circuit. This produces a clean output pulse.

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