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:
Feb. 05, 1985
Filed:
Jul. 02, 1981
Juan F Velazquez, Saline, MI (US);
Irwin Magnetic Systems, Inc., Ann Arbor, MI (US);
Abstract
Analog servo-positioning signals transduced from a recorded member, such as embedded servo signals recorded on a disc memory or the like, which are to be compared to one another in order to derive an error signal indicative of off-track position deviations, are normalized for accurate responsive positioning changes by use of an analog-to-digital converter referenced by both a positive and a negative summation of the two analog signals and supplied with the individual analog signals as inputs, such that the digitalized output comprises a pair of digital signals, the first representative of the quotient of the first analog signal divided by the summation of the two analog signals, and the second representative of the second analog signal divided by the same summation of analog signals. The two resulting digital signals are then processed in a microprocessor by subtracting the second such quotient-representative signal from the first, thereby providing a fully-normalized digital signal representative of the deviation from true position. An analog multiplexer is preferably used as a switching input to the A/D converter, and the latter comprises a multiplying-type A/D converter.