Record carrier including a servo track having first and...

Details Record carrier including a servo track having first and... Record carrier including a servo track having first and...

2005-10-04

2005-10-04

Faber, Alan T. (Department: 2651)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S059120, C369S059230, C369S047480, C369S275400

Reexamination Certificate

active

06952381

ABSTRACT:
A record carrier has a servo track (4) indicating an information track (9) intended for recording information blocks. The servo track (4) has a periodic variation of a physical parameter at a predetermined frequency and modulated parts for encoding position information at regular intervals. The modulated parts start with a bit sync element and are of a data type having a data bit element, or of a word sync type having a word sync element. The word sync element and the data bit element are modulated according to a same predetermined type of modulation of the periodic variation. The effective strength of a modulated element is the number of periodic variations that are substantially different and available for detection of that element. The effective strength of the word sync element and of the data bit element are equal.

REFERENCES:
patent: 4067044 (1978-01-01), Maeda et al.
patent: 4392219 (1983-07-01), Yokozawa et al.
patent: 5023856 (1991-06-01), Raaymakers et al.
patent: 6538982 (2003-03-01), Van Vlerken et al.
patent: 6765861 (2004-07-01), Van Vlerken et al.
patent: 2003/0128640 (2003-07-01), Schep et al.
patent: 2003/0174603 (2003-09-01), Schep et al.
patent: WO0043996 (2000-07-01), None

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