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Rate 4/5 Coding Disclosure Number: IPCOM000060845D
Original Publication Date: 1986-May-01
Included in the Prior Art Database: 2005-Mar-09

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Martin, GNN [+details]


Using the following convention for data bits and code bits: (Image Omitted) where the final bit of a code word has the same value as the final bit of the counterpart data word and is referred to by the same symbol "d", and, for clarity, "s" is used to denote the value of d in the previous code word and "j", the value of e in the next code word, encoding is performed by the following logic: (Image Omitted) This logic gives the following code word set, if "t" is the inverse of s: (Image Omitted) for use on a dicode channel, or for use interleaved on a PR4 channel assuming, additionally, the use of the NRZ convention, where a 1 in the channel strings signifies one direction of write current for one clock interval, and a 0, the opposite current.