Information recording method and information reproduction...

G - Physics – 11 – B

Patent

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G11B 20/18 (2006.01) G11B 20/10 (2006.01) G11B 20/12 (2006.01)

Patent

CA 2676026

When reproduction is performed from an optical disc of a format with which a reproduction device is not compatible, it is possible to prevent acquisition of an erroneous address causing a malfunction. Provided is recording method as follows. Encoding is performed by using an error correction code based on the Reed-Solomon code. For a codeword including a symbol C (i) [i = 0, 1, 2, ...n: n is an integer], a first conversion is performed to bit-invert a predetermined m pieces (1 <= m <= n: m is an integer) of symbols so as to generate conversion information. The conversion information is recorded in a first recording medium. The first conversion is set so that a distance between first information and second information is not smaller than 1/2 of a minimum free distance of the error correction code. The first information is obtained by subjecting the conversion information to an inverse conversion of the first conversion. The second information is obtained by subjecting the conversion information to an inverse conversion of the second conversion which is different from the first conversion.

La présente invention permet de prévenir l'acquisition d'une adresse erronée générée par un dysfonctionnement au cours d'une reproduction effectuée à partir d'un disque optique d'un format avec lequel un dispositif de reproduction n'est pas compatible. À cet effet, l'invention propose un procédé d'enregistrement consistant à effectuer le codage au moyen d'un code de correction d'erreur fondé sur le code de Reed-Solomon. Pour un mot de code comprenant un symbole C (i) [i = 0, 1, 2, ...n : n est un entier], une première conversion est effectuée pour inverser les bits de m pièces prédéterminées (1 <= m <= n : m est un entier) de symboles de façon à générer des informations de conversion. Les informations de conversion sont enregistrées sur un premier support d'enregistrement. La première conversion est réglée de telle sorte que la distance entre des premières informations et des secondes informations est égale ou supérieure à la moitié de la distance libre minimum du code de correction d'erreur. Les premières informations sont obtenues par soumission des informations de conversion à une conversion inverse de la première conversion. Les secondes informations sont obtenues par soumission des informations de conversion à une conversion inverse de la seconde conversion, différente de la première.

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