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What does ADPCM stand for?

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What does ADPCM stand for?

(a) address differential pulse code modulation

(b) adaptive differential pulse code modulation

(c) address dynamic pulse code machine

(d) adaptive dynamic pulse code modulation

The question was asked in a national level competition.

The origin of the question is Codecs topic in portion Interfacing to the Analog World of Embedded Systems

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The correct answer is (b) adaptive differential pulse code modulation

To explain: The adaptive differential pulse code modulation is used in telecommunications and is based on non-linear quantisation values.

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