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. 13, 1985
Filed:
May. 16, 1983
Jerome D Harr, San Jose, CA (US);
Karl R Hense, Los Altos, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A recording channel for a disk file including analog circuits implemented in integrated circuits whose frequency dependent parameters are controllable in response to the value of a control signal supplied to the circuit, as determined by a digital signal. In the preferred embodiment, the control signal to each analog circuit is from a digital to analog converter that is supplied with a digital signal from a register that is addressable and settable from a programmed microcontroller. Certain registers are able to be incremented or decremented by separate clock pulses and function as counters that are controlled by a signal in a feedback path separate from the microcontroller. Components external to the integrated circuits are, therefore, avoided while still maintaining the ability to adjust the analog read circuits to be responsive to data rates of different frequencies.