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:
Mar. 28, 1995
Filed:
May. 17, 1993
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A magnetic disk device using a pattern in which a plurality of pulse trains functioning as a demodulation start synchronization mark, having one-half a frequency of a clock synchronization PLOSYNC but having mutually different pulse numbers, are dispersedly arranged in pulse trains having the same frequency as that of the clock synchronization PLOSYNC, and also using, as a unit for detecting the demodulation start synchronization mark, a unit which confirms coincidence of the pattern in a time unit of one period of the pulse trains of the clock synchronization PLOSYNC and recognizes the demodulation start synchronization mark by complete coincidence of the demodulation start synchronization mark with the pattern or by coincidence of at least a predetermined number of the demodulation start synchronization marks with the pattern.