Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2008-07-08
2008-07-08
Hindi, Nabil Z (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S124140, C369S044340
Reexamination Certificate
active
07397753
ABSTRACT:
A method and system for measuring the signal deviation are applied to an optical recording/reproducing apparatus. The optical recording/reproducing apparatus comprises an optical pickup head for receiving Differential Push Pull (DPP) signals reflected from an optical recording medium to trace the tracks on the surface of the optical recording medium. The DPP signal comprises a Main beam Push Pull (MPP) signal and a Sub-beam Push Pull (SPP) signal. The method firstly receives the MPP signal and the SPP signal to generate an MPP waveform and an SPP waveform separately. Then, the MPP waveform and the SPP waveform are combined to generate an amplitude waveform function. Finally, according to the amplitude waveform function, a phase difference between the MPP signal and the SPP signal is estimated. An adjusting direction can be further determined according to a relative position between the SPP waveform and the MPP waveform.
REFERENCES:
patent: 6594210 (2003-07-01), Kumagai
patent: 7197004 (2007-03-01), Horiyama
Chen Bor-Ruey
Chen Chao-Jen
Chen Jeng-Jiun
Chow Ming
Hindi Nabil Z
Lite-On It Corporation
Sinorica LLC
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