Recording medium, data recording method and apparatus, data...

G - Physics – 11 – B

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G11B 20/10 (2006.01) G06F 21/00 (2006.01) G11B 7/0037 (2006.01) G11B 7/004 (2006.01) G11B 7/007 (2006.01) G11B 20/12 (2006.01) G11B 23/30 (2006.01)

Patent

CA 2360440

Data is recorded in a first part PA1 in accordance with a signal format same as that of an existing CD at the lower limit (1.5 µm) of an allowable value of a track pitch and the lower limit (1.2 m/sec) of a linear velocity. As a result, the data for the maximum regeneration time (74.7 min) can be recorded in the first part PA1. An existing CD reproducing apparatus can reproduce the audio data recorded in the first part PA1 with no problem. Moreover, compressed and encrypted audio data is recorded in a second part PA2 at a single density or a double density. The single density represents a recording density same as that of an existing CD and the double density represents a density two time larger than the single density. Furthermore, the audio data recorded in the second part PA2 is charged when reproduced in order to protect copyrights. The format of the data recorded in the second part PA2 uses the format of a CD-ROM.

On enregistre dans une première zone (PA1) des données dans le même format de signal que celui d'un CD classique avec la limite inférieure (1,5 mu m) acceptable du pas des sillons, et la limite inférieure (1,2 ms) de la vitesse linéaire. On obtient ainsi un temps maximal de reproduction de données (74,7 min) pour la première zone (PA1). Tout lecteur de CD classique peut reproduire lesdites données sans problème. On peut enregistrer dans une deuxième zone (PA2) des données audio comprimées et cryptées en densité simple ou double, la densité simple étant celle d'un CD classique, et la double étant deux fois cette dernière. On facture à l'utilisateur des droits pour les données audio enregistrées dans la deuxième zone lorsqu'elles sont protégées par copyright. Le format des données enregistrées dans la deuxième (PA2) est celui d'un CD-ROM.

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