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What is the function of the edge detector?

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What is the function of the edge detector?

(a) Differentiation

(b) Rectification

(c) Differentiation & Rectification

(d) None of the mentioned

The question was asked during an interview.

The above asked question is from Receiver Synchronization in chapter Synchronization of Digital Communications

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Correct answer is (c) Differentiation & Rectification

Easy explanation: The main operation of the edge detector is differentiation and rectification by the use of square law detector.

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