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:
Dec. 29, 2009
Filed:
Aug. 31, 2007
Motomu Hashizume, Tokyo, JP;
Hiroyuki Mukai, Kanagawa, JP;
Naoko Jinguji, Kanagawa, JP;
Toru Takeuchi, Kanagawa, JP;
Motomu Hashizume, Tokyo, JP;
Hiroyuki Mukai, Kanagawa, JP;
Naoko Jinguji, Kanagawa, JP;
Toru Takeuchi, Kanagawa, JP;
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
Methods and apparatus to perform hard-disk drive head proximity detection in a preamplifier are described. One example method of detecting head position in a hard-disk drive includes obtaining a read signal from a head reading information from a disk; determining a signal envelope of the read signal; comparing the signal envelope to a first threshold to produce a first comparison; filtering the signal envelope; comparing the filtered signal envelope to a second threshold to produce a second comparison; combining the first comparison and the second comparison; and determining if the combination of the first comparison and the second comparison indicates head position oscillation.