Optical recording/reproducing method and apparatus

Details Optical recording/reproducing method and apparatus Optical recording/reproducing method and apparatus

2006-08-01

2006-08-01

Hindi, Nabil (Department: 2655)

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

C369S116000

Reexamination Certificate

active

07085211

ABSTRACT:
In an optical recording/reproducing method and apparatus of the present invention, a modulation parameter is calculated for each of reproduced data signals, each modulation parameter corresponding to one of respective recording powers. An optimum recording power is determined based on a relationship between the modulation parameters and the recording powers, wherein a sequence of pairs of the modulation parameter and the recording power is selected, a gamma, which defines a ratio of a change of the modulation parameter to a change of the recording power, is calculated for each of the selected pairs, and a target recording power corresponding to the optimum recording power is found based on a function derived from a relationship between the calculated gammas and the respective recording powers, the target recording power causing a value of the function to be equal to zero. When selecting the pairs of the modulation parameter and the recording power, a pair of the modulation parameter and the recording power is omitted if a value of the modulation parameter of the pair is not larger than a threshold value, and a pair of the modulation parameter m and the recording power p is selected if a value of the modulation parameter of a following pair first exceeds the threshold value.

REFERENCES:
patent: 5872763 (1999-02-01), Osakabe
patent: 6134209 (2000-10-01), Den Boef
patent: 11-134691 (1999-05-01), None

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