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:
Jul. 01, 2003
Filed:
Oct. 05, 1999
Teruhiko Ushio, Moriyama, JP;
Toshio Kanai, Moriyama, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
Method and apparatus to correct an error of read-out data from a data storage medium, particularly a bit shift error, is described. The correction apparatus includes a gray bit detection circuit which flags bits with a phase shift exceeding a threshold and determines whether the previous or next bit cell has a smaller phase error. An RLL error detection circuit and a table containing valid bit combinations may be used in combination with the gray bit detector to correct errors on-the-fly without degrading performance. An advantage of the invention is that it allows correction of errors without regard to conventional ECC and its maximum number of errors.