Record carrier and apparatus for scanning the record carrier

Details Record carrier and apparatus for scanning the record carrier Record carrier and apparatus for scanning the record carrier

G - Physics

11

B

G11B 20/00 (2006.01) G11B 7/007 (2006.01) G11B 27/19 (2006.01) G11B 27/24 (2006.01)

Patent

CA 2463449

A record carrier (1) is described which has a servo track (4) indicating an information track (9) intended for recording information blocks. The servo track (4) has a periodic variation of a physical parameter at a predetermined frequency, usually called wobble. the servo track has modulated parts for encoding position information according to a predetermined type of modulation. The record carrier comprises a management area in which the servo track comprises permanent data. The permanent data is encoded using a different type of modulation, but using the variations of the same physical parameter. Direct digital modulation (41) is proposed for the different type of modulation. Further a device for reading and/or writing the record carrier is described.

L'invention concerne un support d'enregistrement (1) équipé d'une piste de synchronisation (4) indiquant une piste d'informations destinée à enregistrer des blocs d'informations. La piste de synchronisation (4) présente une variation périodique d'un paramètre physique selon une fréquence prédéterminée, généralement appelée oscillation. La piste de synchronisation présente des parties modulées pour coder des informations de position selon un type de modulation prédéterminé. Le support d'enregistrement comprend une zone de gestion dans laquelle la piste de synchronisation comporte des données permanentes, lesquelles sont codées au moyen d'un type de modulation différent, mais avec les variations du même paramètre physique. La modulation numérique directe (41) est proposée pour le type de modulation différent. L'invention concerne en outre un dispositif de lecture et/ou d'écriture du support d'enregistrement.

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