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Variable-Length Redundancy Removal Coders for Differentially Coded Video Telephone Signals

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1 Author(s)
Ming-Chwan Chow ; Bell Telephone Labs., Inc., N.J.

A study of the statistics of a differential pulse-code modulation coder for Picturephone® signals which uses a three-bit uniform length code suggests that a higher transmission efficiency can be obtained with a variable word length code. This permits an increase in number of quantizing levels used, thus improving picture quality. A quantizer with 24 levels rather than eight can be used provided that a buffer store of 10 000 bits is included in the system to smooth the irregular data flow caused by the varying code word length.

Published in:

IEEE Transactions on Communication Technology  (Volume:19 ,  Issue: 6 )