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US 8,045,438 B2Granted
High frequency modulation of a light beam in optical recording
AssigneeMediatek Inc.
InventorsChih-Chin Hsu, Chih-Yuan Chen
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Abstract
An optical storage system modulates a laser beam based on a high frequency modulation (HFM) signal and a pattern to be recorded on an optical storage medium. At least one of an amplitude and a frequency of the HFM signal is adjusted when using the light beam to record the pattern on the optical storage medium or read data from the medium.
Claims20
A method comprising:
- modulating a light beam based on a trial write pattern and a high frequency modulation (HFM) signal;
- using the light beam to record trial write marks on an optical storage medium;
- detecting recorded trial write marks on the medium;
- adjusting at least one characteristic of the HFM signal based on detected recorded trial write marks;
- and
- recording the trial write marks on the medium using the light beam modulated based on the trial write pattern and the HFM signal having the adjusted characteristic.
3 more elements
A method comprising:
- modulating a light beam based on a trial write pattern and a high frequency modulation (HFM) signal;
- using the light beam to record trial first write marks on an optical storage medium;
- detecting recorded trial write marks on the medium;
- adjusting a frequency of the HFM signal based on detected recorded trial write marks;
- and
- recording the trial write marks on the medium using the light beam modulated based on the trial write pattern and the HFM signal having the adjusted frequency.
3 more elements
A method comprising:
- performing a trial write process to determine at least one optimum value for at least one characteristic of a high frequency modulation (HFM) signal, including:
- recording trial write marks on the optical storage medium using a light beam modulated based on a trial write pattern and the HFM signal;
- detecting recorded trial write marks on the medium;
- and
- adjusting the at least one characteristic of the HFM signal based on detected recorded trial write marks;
- and
- repeating the recording of the trial write marks, the detecting of the recorded trial write marks, and the adjusting of the at least one characteristic of the HFM signal to determine the at least one optimum value for the at least one characteristic of the HFM signal that results in the least error rate.
4 more elements
Dependencies are inferred from the claim text.