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:
Jul. 13, 1999
Filed:
Jun. 24, 1996
Hiroyuki Takimoto, Kanagawa-ken, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An information signal reproducing apparatus for reproducing an information signal from a recording medium on which at least one kind of pilot signal component having a predetermined frequency is multiplexed with the information signal on every other track over a multiplicity of parallel tracks. The apparatus is arranged to form a tracking error signal in accordance with the pilot signal component contained in a signal reproduced during a first period by a head for reproducing a signal by periodically tracing the recording medium at a predetermined period, the first period having a length corresponding to that of the predetermined period, and execute a modifying operation for modifying the tracking error signal by using a signal reproduced by the head during a second period immediately before the first period, the second period having a length corresponding to that of the predetermined period. As another arrangement for producing an appropriate tracking control signal while executing the modifying operation, the apparatus includes a forming circuit for forming a tracking error signal in accordance with the pilot signal component contained in the signal reproduced during the predetermined period in which the head mainly reproduces a track on which the pilot signal component is multiplexed, and the forming circuit includes a sampling circuit for sampling the tracking error signal immediately after a start of the predetermined period and immediately before an end of the predetermined period.