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:
Oct. 31, 1989
Filed:
Sep. 14, 1988
Applicant:
Inventors:
Raymond E Sarraf, Westminster, CO (US);
Daniel R Zaharris, Longmont, CO (US);
Assignee:
MiniScribe Corporation, Longmont, CO (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
360 7804 ;
Abstract
A circuit for accurately detecting the number of tracks crossed by a reading head during motion thereof across a record medium uses a state machine operation to detect track crossing transitions and to suppress the effect of noise. The head produces a signal which assumes one of four unique states in sequence as successive tracks are crossed. The circuit detects a valid track crossing when a generated next state is the correct next state for a present state indicated by the signal.