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, 2004
Filed:
Aug. 23, 2001
Koji Osafune, Ome, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A signal is read out from a two-layered perpendicular magnetic recording medium by a composite head formed from a single-pole perpendicular recording head and magnetoresistance effect type reproduction head. The read-out signal is amplified by a head amplifier, passed through a low-pass filter, and converted into a digital signal by an analog/digital converter. A DC restoring circuit restores a DC component removed by the head amplifier using the output signal from the analog/digital converter. An adder adds the restored DC component to the output signal from the analog/digital converter, thereby restoring the head output terminal signal. A servo demodulation circuit generates a position error signal on the basis of the restored signal.