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:
Aug. 16, 2011
Filed:
Jul. 16, 2009
Applicants:
Masayoshi Takahashi, Yokohama, JP;
Masami Makuuchi, Yokohama, JP;
Shinji Homma, Nakai, JP;
Yoshihiro Sakurai, Hadano, JP;
Inventors:
Masayoshi Takahashi, Yokohama, JP;
Masami Makuuchi, Yokohama, JP;
Shinji Homma, Nakai, JP;
Yoshihiro Sakurai, Hadano, JP;
Assignee:
Hitachi High-Technologies Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/09 (2006.01); G11B 20/10 (2006.01); G11B 21/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention provides a technique for converting burst data to digital data, applying FFT operation to 2(n is an integer) pieces of digital data in response to any start signal synchronized with a sector signal, applying a window function centered around data corresponding to a frequency of a burst data signal component before the FFT operation, and performing head positioning based on a result as the detected value of the burst data.