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:
May. 27, 2008
Filed:
Dec. 15, 2004
Yukiyasu Tatsuzawa, Yokohama, JP;
Koichi Otake, Yokohama, JP;
Hideyuki Yamakawa, Kawasaki, JP;
Hiroyuki Moro, Ome, JP;
Toshihiko Kaneshige, Yokohama, JP;
Yukiyasu Tatsuzawa, Yokohama, JP;
Koichi Otake, Yokohama, JP;
Hideyuki Yamakawa, Kawasaki, JP;
Hiroyuki Moro, Ome, JP;
Toshihiko Kaneshige, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A disk apparatus has an equalizing unit which performs PR equalization for the read signal from the disk based on a plurality of tap coefficients, a decoding unit which performs a decoding process for the equalized read signal, a calculating unit which obtains an ideal signal of the decoded read signal, and compares the ideal signal with the decoded read signal, thereby calculating an error signal E, and a control unit which groups the tap coefficients into at least a first and second coefficient groups which are groups of tap coefficients at symmetrical locations each, and determines tap coefficients of the first coefficient group in a range of a first limit value Kaccording to the calculated error signal, determines tap coefficients of the second coefficient group in a range of a second limit value and supplies the determined tap coefficients to the equalizing unit.