Record carrier and devices for reading and recording such a reco

Details Record carrier and devices for reading and recording such a reco Record carrier and devices for reading and recording such a reco

1995-02-16

1998-11-17

Elmore, Reba I.

Excavating

371 371, 371 375, 371 374, 371 401, 371 402, 371 471, 371 70, G11C 2900

Patent

active

058386963

ABSTRACT:
A record carrier 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 (20) which includes control words and a data portion (21) 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. A device for reading a data signal recorded on such a record carrier includes first and second error correcting (45), (47) for correcting errors in the data words respectively in response to the added second and first types of codewords. The device further includes circuit 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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