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:
Jan. 06, 2004
Filed:
Mar. 16, 1999
Shogo Miyanabe, Tsurugashima, JP;
Hiroki Kuribayashi, Tsurugashima, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A tracking controller capable of conducting a correct tracking control even if a recording track is formed with a narrow track pitch on a recording disk. The tracking controller calculates an error value between a read signal read from a recording track intended for reading and a predetermined value, a first coefficient from a correlation between a read signal read from a recording track adjacent to the recording track intended for reading on the inner peripheral side of the disk and the error value, and a second coefficient from a correlation between a read signal read a recording track adjacent to the recording track intended for reading on the outer peripheral side of the disk and the error value. A difference between the first and second coefficients is calculated as a tracking offset which is subtracted from a tracking error to correct a tracking offset.