Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2007-05-29
2007-05-29
Hindi, Nabil (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S124150, C369S047270
Reexamination Certificate
active
10624556
ABSTRACT:
A method, apparatus, and computer readable medium controlling a servo of a recording and/or reproducing apparatus, using a detected header field signal. An optical recording and/or reproducing apparatus includes a playback signal detector that detects a playback signal and a track error signal from information recorded on a DVD-RAM disc, as picked up by a pickup. A header field signal detecting circuit detects a header field signal by comparing a sampled playback signal for a signal representing the presence of a header field with a reference level and holding the comparison result for a predetermined period of time to generate the header field signal. Accordingly, a tracking servo can be stably controlled by using a tracking driving signal that is not affected by the presence of a header. Also, in a seek mode, the track error signal can be held based on the header field signal to generate a track count signal that is similarly not affected by the header. As a result, the number of tracks on the DVD-RAM disc can be accurately counted by using the track error signal.
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patent: 4785442 (1988-11-01), Ohtake et al.
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patent: 6614740 (2003-09-01), Park et al.
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*Reference AA (U.S. 6,614,730) is substantially equivalent to Reference AJ (JP 2000-353318).
Office Action issued in Japanese Patent Application No. 2003-194845 on Jan. 17, 2006.
Jung Soo-yul
Yoon Yong-seok
Hindi Nabil
Stein, McEwen & Bui LLP
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