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:
Nov. 21, 2006
Filed:
Mar. 17, 2003
Motoyasu Tsunoda, Yokohama, JP;
Yukie Miyazawa, Legal Representative, Yokohama, JP;
Hitoshi Ogawa, Yokohama, JP;
Ryutaro Horita, Yokohama, JP;
Takashi Nara, Takasaki, JP;
Masatoshi Nishina, Kanagawa-ken, JP;
Katsumi Yamamoto, Kokubunji, JP;
Motoyasu Tsunoda, Yokohama, JP;
Yukie Miyazawa, legal representative, Yokohama, JP;
Hitoshi Ogawa, Yokohama, JP;
Ryutaro Horita, Yokohama, JP;
Takashi Nara, Takasaki, JP;
Masatoshi Nishina, Kanagawa-ken, JP;
Katsumi Yamamoto, Kokubunji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A signal processing device for analog-to-digital converting a burst signal has a feature of selecting a data bus to notify a disk control device of a conversion result via an NRZ data bus. The disk control device stores the result of the analog-to-digital conversion of the servo positional signal. The positional signal of a head of the disk device is digitized in a R/W channel. Sampling for digital conversion is performed in only a window which is defined only in the vicinity of peaks of the positional signal. The values of peaks which are obtained by sampling are averaged by an averaging circuit. This enables the influence of noise occurred outside of the window to be eliminated. Although the noise in the window is sampled, its adverse influence is suppressed by the averaging processing.