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Which of the following works by increasing the dynamic range?

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Which of the following works by increasing the dynamic range?

(a) logarithmic codec

(b) linear codec

(c) DPCM

(d) PCM

I got this question during an online exam.

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

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Right option is (c) DPCM

For explanation I would say: The differential pulse code modulation can improve the accuracy and resolution by having a 16-bit dynamic range. It works by the increasing dynamic range.

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