Encoding/decoding system for optical recording/reading

Details Encoding/decoding system for optical recording/reading Encoding/decoding system for optical recording/reading

1989-07-19

1991-04-16

Shoop, Jr., William M.

Coded data generation or conversion

Digital code to digital code converters

To or from 'n' out of 'm' codes

369124, 341 95, H03M 720

Patent

active

050086693

ABSTRACT:
A system for encoding/decoding an 8-bit binary code into/from a 4/11 channel code is disposed such that an 8-bit binary code is encoded into a 11-bit channel code by adding a 3-bit extension code as a parity code which keeps the number of "1"s in the channel code at four. When the 8-bit binary code cannot be encoded by this rule, it is converted to a temporary 8-bit code by a table encoder and then a 3-bit extension code is added. The 4/11 channel code is decoded referring to the 3-bit extension code, which indicates the encoding rule by which the 4/11 channel code has been generated. When the 4/11 channel code is detected to have been encoded by the bits-adding rule, an original 8-bit binary code is derived from the 4/11 code by removing the 3-bit extension code. When the 4/11 channel code has been encoded by the table-encoding rule, it is decoded by a table decoder.

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