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:
Mar. 06, 1990
Filed:
Sep. 23, 1988
Nobumasa Nishiyama, Hachioji, JP;
Makoto Saito, Tokyo, JP;
Yasuhide Ouchi, Koganei, JP;
Yasuhiro Katoh, Tokyo, JP;
Yoshihasa Kamo, Kokubunji, JP;
Makoto Koizumi, Hachioji, JP;
Hajime Aoi, Tachikawa, JP;
Naoki Sato, Hachioji, JP;
Reijiro Tsuchiya, Kokubunji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A readout circuit in magnetic recording device is disclosed, in which a test data signal for detecting an error in the characteristics of an automatic equalizer is recorded in a predetermined position of each track of a magnetic recording medium. In readout mode, a test data signal for a selected track is read out first, and this signal is compared with a reference signal dependent on the system conditions to determine an error from the reference signal. The optimum equalization coefficient is determined to eliminate this error from the reference signal and is set in the equalizer. The data is readout under the optimum equalization characteristics thus set.