The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 10, 2004
Filed:
Dec. 04, 1997
Gijsbert J. Van Den Enden, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
Information is represented on the track or tracks of a record carrier by marks organised into bit cells having a constant bit length B . For indicating the track, the record carrier has a servopattern in which a winding number is coded in each winding of the track. The ratio between the track pitch and the bit length is determined in such a way that the increase of the length of the windings corresponds between consecutive windings to an integral number of bits. Thus, the position of an information block somewhere in the track is determined from the ratio and the winding number in a simple manner and with great accuracy, because no rounding errors are produced when a computation using integers is performed. The device is provided with clock apparatus for generating a bit clock synchronously with the bit cells during scanning of the track, the clock apparatus generates the bit clock in a predetermined relation with the track pitch T , such that m*B =n*&pgr;*T , in which n and m are integers which are larger than or equal to 1.