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. 28, 2017
Filed:
Nov. 17, 2016
Applicant:
Western Digital Technologies, Inc., Irvine, CA (US);
Inventors:
Erik J. Eklund, Newport Beach, CA (US);
Timothy A. Ferris, Mission Viejo, CA (US);
Assignee:
Western Digital Technologies, Inc., Irvine, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 33/08 (2006.01); H04L 25/49 (2006.01); G11B 19/20 (2006.01); G01P 15/08 (2006.01);
U.S. Cl.
CPC ...
H04L 25/4902 (2013.01); G01P 15/0802 (2013.01); G11B 19/20 (2013.01);
Abstract
A method of tuning a notch filter in a data storage device (DSD) including the notch filter and a shock detection system includes: adjusting pulse width modulator (PWM) frequency settings of a spindle drive signal; detecting a maximum noise level of an output signal of the shock detection system while adjusting the PWM frequency settings; and selecting a notch filter frequency corresponding to a PWM frequency setting at which the maximum noise level of the output signal of the shock detection system is detected.