Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital data error correction
Patent
1998-08-19
2000-04-04
De Cady, Albert
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital data error correction
714752, G11C 2900
Patent
active
060473975
ABSTRACT:
A read device for reading a record carrier which has recorded thereon a data signal which represents data words, added codewords of a first type and added codewords of a second type. The added codewords of the first type have a predefined first relation to the data words, and the added codewords of the second type have a second predefined relation to the data words and the added codewords of the first type. The added codewords of both types enable error correction according to a given algorithm. The data signal is divided into blocks which each contain a control portion which includes control words and a data portion which includes user-supplied data words. The data words and added first and second type codewords are ordered and interrelated so that the order of the data words is not altered by error correction according to the given algorithm, and the second-type codewords are located closer to the related control data words than are the first-type codewords. The read device includes first and second decoders (45, 47) for correcting errors in the data words respectively in response to the added second type and first type codewords. The read device further includes means for deriving control words from the control portions of the data signal blocks, which control words have either not been error corrected or have been error corrected solely in response to second type codewords. The control portions may include sector address information, and so can be used for rapid block searching.
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Cady Albert De
Chase Shelly A
Eason Leroy
U.S. Philips Corporation
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