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:
Mar. 21, 2000
Filed:
Aug. 22, 1997
Applicant:
Inventors:
Thomas A Quan, Mt. View, CA (US);
John L Grimsley, Los Altos, CA (US);
Assignee:
Oak Technology, Inc., Sunnyvale, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 4434 ; 369 4428 ; 369 59 ; 369124 ;
Abstract
Adjustment of disc-drive pickup signals in a manner that responds dynamically to changes in such signals while in use. Adjustment is directed toward achieving an approximately symmetric (i.e., 50-50) duty cycle. A variable integration rate of symmetry error responds to fluctuations in pickup signal frequency to achieve more accurate adjustment of quadrature track crossing signals during a search operation.