Optical disk with wobbled tracks and apparatus using this optical disc
AssigneeKabushiki Kaisha Toshiba
InventorsYuji Nagai, Chosaku Noda, Akihito Ogawa, Kazuto Kuroda
Life of this patent
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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.
Claims8
1-12. (canceled)
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 sync signal used in sync detection of the address information is formed by N wobbles per bit as a basic unit, and the sync signal with that configuration is recorded on the head side of the address information, where integer N is the number of wobble waves and M=2N, and
- the sync signal is formed using a pattern, which is selected from signal patterns, and has a largest or second largest minimum Hamming distance to all address information symbols and an out-of-phase sync signal among the defined signal patterns and has a smallest number of phase changes in the sync signal.
Dependencies are inferred from the claim text.