Optical information recording medium, recording and reproduction method, and recording and reproduction device
AssigneesHitachi Consumer Electronics Co., Ltd., Hitachi-LG Data Storage, Inc.
InventorAtsushi Kikugawa
Life of this patent
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Abstract
In the land-groove method, wobble interference is reduced. STW modulation is used as wobble modulation for a part where wobble interference can occur, for example, a part where the configurations of both side walls of the groove are not the same and groove width modulation is unavoidable. Thereby, the amplitude of the groove width modulation can be suppressed to a quarter of that when BPSK modulation is used.
Claims13
An optical information recording medium having a constant angular wobble format,
- wherein a data type held by a wobble is classified and arranged based on a frequency of occurrence of a wobble interference, and
- for the data type where the frequency of occurrence of the wobble interference is not less than one, a waveform where an amplitude of the wobble interference is smaller than twice an amplitude of a carrier wobble is used as a wobble modulated waveform.
An information recording method using a land-groove optical information recording medium having a constant angular wobble format, wherein a data type held by a wobble is classified and arranged based on a frequency of occurrence of a wobble interference and for the data type where the frequency of occurrence of the wobble interference is not less than one, a waveform where an amplitude of the wobble interference is smaller than twice an amplitude of a carrier wobble is used as a wobble modulated waveform, the method comprising:
- a step of reproducing a wobble signal from the optical information recording medium;
- a step of obtaining address information from the wobble signal;
- a step of generating recording start timing information with reference to the obtained address information;
- and
- a step of recording user information in a desired segment based on the timing information.
An information reproduction method using a land-groove optical information recording medium having a constant angular wobble format, wherein a data type held by a wobble is classified and arranged based on a frequency of occurrence of a wobble interference and for the data type where the frequency of occurrence of the wobble interference is not less than one, a waveform where an amplitude of the wobble interference is smaller than twice an amplitude of a carrier wobble is used as a wobble modulated waveform, the method comprising:
- a step of reproducing a wobble signal from the optical information recording medium;
- a step of obtaining address information from the wobble signal;
- and
- a step of reading user information from a desired segment with reference to the obtained address information.
Dependencies are inferred from the claim text.