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Which two noises are present in Delta Modulation (DM)?

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Which two noises are present in Delta Modulation (DM)?

(a) Slope overload and Thermal noise

(b) Granular and shot noise

(c) Slope overload and granular noise

(d) Thermal and shot noise

I have been asked this question during an internship interview.

I need to ask this question from Disadvantages of Filter Method topic in chapter SSB Modulation of Analog Communications

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The correct answer is (c) Slope overload and granular noise

The best I can 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. Slope overload noise occurs when the input signal slope is higher than the delta modulator’s capability. Granular noise is produced due to level input signal resulting into the oscillatory output. So for getting rid of these noises we use ADM (Adaptive Delta Modulation).

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