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:
Apr. 21, 1992
Filed:
Aug. 04, 1988
Yasuo Mitsuhashi, Nagaokakyo, JP;
Takashi Mishima, Nagaokakyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An automatic tracking control system for use in a magnetic recording and/or reproducing apparatus, which system includes a servo control circuit for controlling a tracking phase of a rotary head assembly; a search control circuit for causing the servo control circuit to vary the tracking phase in a predetermined quantity thereby to make a search so as to reciprocate within a predetermined tracking phase area; a detecting circuit for detecting envelope voltage values of an audio signal and a video signal reproduced for each search point and summing such signals together to provide a composite envelope value; and a reference tracking phase setting circuit for detecting the tracking phase, at which an optimum tracking can be attained when the reproduced signals are integrated from the composite envelope value, thereby to set a reference tracking phase which provides a reference value to the servo control circuit.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile