G - Physics – 11 – B
Patent
G - Physics
11
B
354/68
G11B 20/14 (2006.01)
Patent
CA 1152649
ABSTRACT OF THE DISCLOSURE A method and apparatus for encoding binary data in a data stream so as to increase the number of data bits represented by one transition, such as a transition recorded on a magnetic medium, and thereby increase the storage density. The data stream is converted into words each having m bits. Two of the data words are stored so as to be simultaneously accessible to a converting system that converts the data words into code words wherein each code word has n bits. In the invention, m/n=2/3. In order to increase the space between adjacent transitions, the conversion is carried out according to a scheme wherein all code words have at least one binary ONE and lack successive binary ONEs except certain cases in which a code word is converted to all ZEROs to avoid ONEs in the nth bit of a given code word and the first bit of the code word following the given code word. Also described is a decoding method and apparatus for recovering the encoded data and decoding it to the original binary data.
360864
Bates Charles A. III
Cohn Martin
Jacoby George V.
Kirby Eades Gale Baker
Sperry Corporation
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