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What does PCM stand for?

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What does PCM stand for?

(a) pulse codec machine

(b) pulse code modulation

(c) peripheral code machine

(d) peculiar code modulation

The question was posed to me in an interview for internship.

My enquiry is from Codecs in portion Interfacing to the Analog World of Embedded Systems

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The correct answer is (b) pulse code modulation

The explanation: The linear codec is also known as pulse code modulation which is commonly used in the telecommunications industry.

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