Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2006-06-06
2011-10-04
Klimowicz, Will J (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S059250
Reexamination Certificate
active
08031564
ABSTRACT:
The invention relates to a method for evaluating a wobble signal. Also described is a circuit for performing such method and an apparatus for reading from and/or writing to optical recording media using such method or circuit. According to the invention the method includes the steps of:determining the sign of the wobble signal, the sign indicating whether a wobble period of the wobble signal is inverted or non-inverted,generating a filtered signal by a weighted averaging of the sign over two or more wobble periods, the weighted averaging being performed by subtracting a sum of the signs obtained from a second stage of delay lines from a sum of the signs obtained from a first stage delay lines, andintegrating the filtered signal.
REFERENCES:
patent: 7280450 (2007-10-01), Buchler
patent: 7292522 (2007-11-01), Nagai et al.
patent: 2004/0240346 (2004-12-01), Yoshioka
patent: 1 315 154 (2003-05-01), None
patent: 1 388 850 (2004-02-01), None
Search Report Dated Nov. 16, 2005.
Patent Abstracts Pf Japan vol. 2003, No. 12, Dec. 5, 2003 & JP 2003 346343 A (Sony Corp), Dec. 5, 2003 *abstract*.
Chu Kim
Jack Schwartz & Associates PLLC
Klimowicz Will J
Thomson Licensing
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