Data recording medium, data recording method, and data...

Details Data recording medium, data recording method, and data... Data recording medium, data recording method, and data...

2007-07-17

2007-07-17

Lamarre, Guy (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

Reexamination Certificate

active

10482407

ABSTRACT:
With data of four symbols (FIG.11A), a parity of two symbols (FIG.11B) is created. These six symbols are EFM-modulated. Each symbol of eight bits is converted into a pattern of 14 bits (FIG.11C). In a pit/land sequence formed on a disc (FIG.11D), two symbols are rewritten. One symbol is (0×40). When an additional recording process is performed for the bit/land sequence, the pit length becomes long (FIG.11E). The reproduced 14-bit data is converted into eight bits on the reproducing side. Thus, the original data (0×40) is rewritten to (0×22). A parity is also changed so that the additionally recorded data symbol (0×22) is not detected as an error.

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