Disc-shaped recording medium, disc-state recording medium...

G - Physics – 11 – B

Patent

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Details

G11B 7/007 (2006.01) G11B 20/12 (2006.01) G11B 27/19 (2006.01) G11B 27/24 (2006.01) G11B 7/26 (2006.01) G11B 27/30 (2006.01)

Patent

CA 2408216

An optical disc having a circular track formed as a groove and/or land for recording data and wobbled. The track wobbling is performed on a constant unit of an FSK information bit portion based on a waveform obtained by FSK modulation of an information bit and a single frequency portion based on a waveform of a single frequency, so that the constant units are continuous. For the FSK modulation, two types of frequencies are used. One of the frequencies is a frequency identical to the single frequency and the other is different from the single frequency. The relationship of these frequencies is such that for a predetermined period of time, the wave number of these frequencies are even and odd.

L'invention concerne un disque optique possédant une piste circulaire sous forme de sillon et/ou d'espace vierge permettant d'enregistrer des données et oscillante. L'oscillation de la piste est effectuée sur une unité constante d'une partie binaire d'informations en mode FSK (modulation par déplacement de fréquence), en fonction d'une forme d'onde obtenue par une modulation en mode FSK d'un bit d'informations et d'une partie de fréquence unique, en fonction d'une forme d'onde d'une fréquence unique, de manière que les unités constantes soient continues. Deux types de fréquences sont mises en oeuvre pour la modulation en mode FSK. Une de ces fréquences est une fréquence identique à la fréquence unique et l'autre est différente de la fréquence unique. La relation entre ces fréquences est telle que pendant une durée prédéterminée, le nombre d'ondes de ces fréquences est pair et impair.

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