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What is the abbreviation of DM?

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What is the abbreviation of DM?

(a) Diameter Modulation

(b) Distance Modulation

(c) Delta Modulation

(d) None of the mentioned

This question was posed to me in an internship interview.

I'd like to ask this question from Oversampling A/D Converters topic in portion Sampling and Reconstruction of Signals of Digital Signal Processing

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Right answer is (c) Delta Modulation

The explanation is: The simplest form of differential predictive quantization is called delta modulation (DM).

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