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What is the Mu-Law PCM voice coding standard used in North American T-Carrier telecommunications transmission systems? June 8, 2009

Posted by HubTechInsider in Definitions, Telecommunications, VUI Voice User Interface.
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Sampling and 4-bit quantization of an analog s...

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Mu-Law encoding is the PCM voice coding standard used in Japan and North America. It is a companding standard, both compressing the input and expanding the data upon opening after transmission. Mu Law is a PCM (Pulse Code Modulation) encoding algorithm where the analog voice signal is sampled eight thousand times per second, with each sample being represented by eight bits, thus yielding a raw transmission rate of 64 Kps. Each sample consists of a sign bit, a three bit segment which specifies a logarithmic rqange, and a four bit step offset into the range. The bits of the sample are inverted before transmission. A Law encoding is the voice coding standard which is used in Europe.

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1. An explanation of the Nyquist Theorem and its importance to Mu-Law Encoding in North American T-Carrier Telecommunications Systems « Hub Tech Insider - June 8, 2009

[…] must be sampled 8000 times per second. The Nyquist Theorem is the mathematical underpinning of the Mu-Law encoding technique used in T-Carrier transmission systems. T-Carrier is used in North American […]

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