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:
Aug. 17, 1982
Filed:
Dec. 08, 1980
Applicant:
Inventor:
Glen P Double, Charlotte, NC (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
360-2 ; 235474 ; 235476 ; 235482 ; 360 73 ;
Abstract
A time base signal for controlling the recording of binary data is developed by measuring the velocity of a magnetic record. The velocity is measured by determining an average velocity by the time interval required for a mark recorded by a write head to move a predetermined distance to a read head and correcting the average velocity as a function of the acceleration of the record. The acceleration is determined by recording a reference frequency pattern at a first station, reading the pattern at a second station, and measuring the difference between the written and read patterns.