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:
Nov. 08, 1994
Filed:
Sep. 27, 1993
Michael G Fairchild, Webster, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
A method and apparatus for detecting and processing synchronization marks extracted from a prerecorded wobbled groove formed in a compact disk in order to produce pseudo-sync signals. The method comprises the steps of: i) extracting an FM signal from the wobbled groove and converting such FM signal into biphase data; ii) extracting a clock signal from the biphase data; iii) detecting in each block of information a predetermined sequence of biphase data representing a sync mark to produce a sync detect signal; iv) generating a time window signal in which, in each block of information, a valid sync detect signal is expected to occur; v) in response to a valid sync detect signal detected within the window signal of a given block of information, generating a pseudo-sync signal in the next block of information; vi) in the case of no valid sync detect signal within the window signal of the given block of information, generating a pseudo-sync signal for the next block of information from the last valid sync detect signal; and vii) indicating a system error when a predetermined number of sync detect signals are not detected within their corresponding time window signal.