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:
Dec. 01, 1992
Filed:
Aug. 31, 1990
Kengo Sudoh, Hiroshima, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A coefficient setting circuit sets, in registers, coefficients corresponding to a position of each magnetic heads on a rotary drum. A counter circuit counts the number of pulses of a first reference clock signal employed as a reference signal for rotational control of the rotary drum. Comparison circuits compare the coefficients, set in registers, with a count value of the counter circuit and outputs reset pulses r1 and r2 when a match is detected between the set coefficients and the count value. In response to these reset pulses r1 and r2, counter circuits are reset to start the counting operation of a second reference clock signal. Consequently, decoders output timing pulses for controlling the timing of recording or reproducing operations for each magnetic head. The coefficients set by coefficient setting circuit are altered in accordance with alterations in the position of each magnetic head or the shape of the rotary drum, resulting in appropriate timing pulses.