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US 7,068,587 B2Granted
Method for reproducing information data from a recording medium having dummy data shifted at random
AssigneesHitachi, Ltd., Hitachi Maxell, Ltd.
InventorsYasushi Miyauchi, Motoyasu Terao, Akemi Hirotsune, Hiroyuki Minemura, Harukazu Miyamoto
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Abstract
An optical reproducing method adds a dummy signal to at least a leading or trailing side of a recording signal recorded on an information recording medium. The duty ratio of the dummy signal is not greater than 50%, and the recording start position of the combined recording signal and dummy signal is shifted at random.
Claims1
An optical reproducing method using an information recording medium in which a recording signal and a dummy signal added to at least a leading or trailing side of the recording signal is recorded,
- wherein a duty ratio of the dummy signal is not greater than 50%,
- and wherein a recording start position of a combined recording signal and dummy signal is shifted at random;
- said method comprising the steps of;
- irradiating an optical spot on said optical recording medium;
- detecting a reflected beam from said optical recording medium;
- reproducing information on said optical recording medium by using a signal obtained by the reflected beam.
3 more elements
Dependencies are inferred from the claim text.