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. 30, 1983
Filed:
Mar. 02, 1981
Seisuke Hiraguri, Yokohama, JP;
Victor Company of Japan, Ltd., Yokohama, JP;
Abstract
A tracking control system is applied to a magnetic recording and/or reproducing apparatus in which magnetic heads (having gaps of mutually different azimuth angles) relatively scan a magnetic recording medium to record and/or reproduce an information signal thereon and/or therefrom. The tracking control system comprises a tracking reference signal supplying circuit for supplying a tracking reference signal to the magnetic heads so that the magnetic heads are positioned at a position where the recorded position of a tracking reference signal on both sides of the tracks adjacent to a certain track, is positioned successively shifted respectively along the track longitudinal direction with respect to the tracking reference signal recorded position at the above certain track. The magnetic head record the information signal together with the tracking reference signal. The tracking control system further comprises a discriminating circuit for discriminating the relative phase of a tracking reference signal reproduced from a reverse track which is adjacent to a normal track and recorded by a magnetic head having an azimuth angle different from that of a reproducing magnetic head, according to a tracking reference signal reproduced from the normal track which is recorded by a magnetic head having an azimuth angle identical to that of the reproducing magnetic head, tracking error signal deriving circuit for deriving a tracking error signal from the output signal of the discriminating circuit, and controlling circuit for controlling the relative scanning phase of the magnetic heads with respect to the track of the magnetic recording medium in response to the tracking error signal obtained by the tracking error signal deriving circuit. The frequency of the tracking reference signal supplied by the tracking reference signal supplying circuit is selected so that the level of the tracking reference signal reproduced from the normal track is always higher than that of the tracking reference signal reproduced from the reverse track.