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:
Jan. 24, 1995
Filed:
Oct. 22, 1993
Ronald E Tollum, Simi Valley, CA (US);
Wangtek, Inc., Simi Valley, CA (US);
Abstract
Special tape drive read circuitry generally qualifies read voltage peaks by establishing a minimum amplitude for valid peaks in the read voltage signal so that noise is not interpreted as peaks, but does not require amplitude qualification during periods of dropout in the read voltage signal. Additional circuitry recognizes two of the data errors most common to GCR, and allows for these errors to be corrected. The first kind of error is the tri-bit error, in which 01110 is misinterpreted as 01000. The other kind of error is the low frequency error, in which 10010 is misinterpreted as 11000. Also, the type of error detected is used to adjust the read drive's hysteresis setting, to reduce future errors of the same type.