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In a delta modulation system, granular noise occurs when the

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In a delta modulation system, granular noise occurs when the

(a) Modulating signal increases rapidly

(b) Pulse rate decreases

(c) Pulse amplitude decreases

(d) Modulating signal remains constant

This question was addressed to me in an internship interview.

I would like to ask this question from PAM,PWM and TDM in portion Modulation and Coding Trade-off of Digital Communications

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Right choice is (d) Modulating signal remains constant

For explanation: In a delta modulation system, granular noise occurs when the modulating signal remains constant.

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