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What is the standard value of μ in μ-law ?

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What is the standard value of μ in μ-law ?

(a) 128

(b) 255

(c) 256

(d) 0

This question was addressed to me by my college professor while I was bunking the class.

The origin of the question is Uniform and Non Uniform Quantization topic in division Formatting and Baseband Modulation of Digital Communications

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The correct answer is (b) 255

To explain I would say: The standard value of μ in μ-law is 255.

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