Optical disc with wobbled tracks and apparatus using this optical disc
AssigneeKabushiki Kaisha Toshiba
InventorsYuji Nagai, Chosaku Noda, Akihito Ogawa, Kazuto Kuroda
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Abstract
Address information is formed by M wobbles (integer M is the number of wobble waves) per bit as a basic unit, and is NRZ-recorded. Also, a sync signal used in sync detection of the address information is formed by N wobbles per bit as a basic unit (integer N is the number of wobble waves and M=2N). The sync signal with such configuration (6 wobbles per bit) is recorded on the head side of the address information (12 wobbles per bit). In this way, even when external noise is large, a modulated wobble signal can be demodulated more accurately.
Claims12
An optical disc on which wobbled grooves are concentrically or spirally formed, and physical address information is recorded by modulating groove wobbles,
- wherein address information is formed by M wobbles per bit as a basic unit, and the address information is NRZ-recorded, where integer M is the number of wobble waves.
An optical disc reproduction apparatus configured to reproduce information from an optical disc on which wobbled grooves are concentrically or spirally formed, and physical address information is recorded by modulating groove wobbles,
- wherein address information is formed by M wobbles per bit as a basic unit, and the address information is NRZ-recorded, where integer M is the number of wobble waves.
A system for recording information on an optical disc on which wobbled grooves are concentrically or spirally formed, and physical address information is recorded by modulating groove wobbles, wherein address information is formed by M wobbles per bit as a basic unit, and the address information is NRZ-recorded, where integer M is the number of wobble waves.
Dependencies are inferred from the claim text.