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Gray code
The reflected binary code, also known as Gray code after Frank Gray, is a binary numeral system where two successive values differ in only one bit (binary digit).
The reflected binary code was originally designed to prevent spurious output from electromechanical switches. Today, Gray codes are widely used to facilitate error correction in digital communications such as digital terrestrial television and some cable TV systems.
== Name ==
Bell Labs researcher Frank Gray introduced the term ''reflected binary code'' in his 1947 patent application, remarking that the code had "as yet no recognized name".〔F. Gray. ''Pulse code communication'', March 17, 1953 (filed Nov. 1947). 〕 He derived the name from the fact that it "may be built up from the conventional binary code by a sort of reflection process".
The code was later named after Gray by others who used it. Two different 1953 patent applications use "Gray code" as an alternative name for the "reflected binary code";〔J. Breckman. ''Encoding Circuit'', Jan 31, 1956 (filed Dec. 1953). 〕〔E. A. Ragland et al. ''Direction-Sensitive Binary Code Position Control System'', Feb. 11, 1958 (filed Oct. 1953). 〕 one of those also lists "minimum error code" and "cyclic permutation code" among the names.〔 A 1954 patent application refers to "the Bell Telephone Gray code".〔S. Reiner et al. ''Automatic Rectification System'', Jun 24, 1958 (filed Jan. 1954). 〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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