Method and apparatus for recording and reproducing signal on...

Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal

Reexamination Certificate

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Reexamination Certificate

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07729218

ABSTRACT:
Test signals are recorded on a prescribed area in an optical disc. The prescribed area is scanned by a laser beam while the power of the laser beam is changed among different DC erasing values. The different DC erasing values are assigned to the recorded test signals, respectively. The recorded test signals are reproduced from the prescribed area to obtain reproduced signals. Parameter values of the respective reproduced signals are detected. The detected parameter values correspond to the different DC erasing values, respectively. Among the detected parameter values, a detected parameter value is decided which matches a target. One corresponding to the decided parameter value is selected from the different DC erasing values. A prescribed coefficient and the selected DC erasing value are multiplied to calculate an optimum level of an erasing power of the laser beam.

REFERENCES:
patent: 5872763 (1999-02-01), Osakabe
patent: 10-064064 (1998-03-01), None
patent: 10-293926 (1998-11-01), None
patent: 2003-045031 (2003-02-01), None
patent: 2003-162821 (2003-06-01), None

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