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Which of the following conversion is performed by using a lookup table?

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Which of the following conversion is performed by using a lookup table?

(a) DPCM

(b) ADPCM

(c) Between DPCM and ADPCM

(d) Linear cdec and a-law

I have been asked this question in final exam.

This interesting question is from Codecs in portion Interfacing to the Analog World of Embedded Systems

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Right answer is (d) Linear cdec and a-law

Easiest explanation: The conversion between a-law/µ-law and a linear digital signal or between µ-law and a-law is performed by a lookup table.

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