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Granular noise occurs in Delta Modulation, when ____________

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Granular noise occurs in Delta Modulation, when ____________

(a) pulse rate decreases

(b) pulse amplitude decreases

(c) modulating signal increases

(d) modulating signal remains constant

I had been asked this question during an interview.

I'm obligated to ask this question of Phase Shift Method topic in portion SSB Modulation of Analog Communications

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Right option is (d) modulating signal remains constant

To explain: Delta modulation is used for transmission of voice information where quality is not the primarily importance. Its drawback is it has two noises namely slope overload and granular noise. Granular noise is produced due to constant modulating input signal resulting into oscillatory output. So for getting rid from these noises we use ADM (Adaptive Delta Modulation).

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