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:
Jan. 03, 2002
Todd G. Culman, San Jose, CA (US);
Roger F. Hoyt, San Jose, CA (US);
Todd G. Culman, San Jose, CA (US);
Roger F. Hoyt, San Jose, CA (US);
Hitachi Global Storage Technologies B.V., Amsterdam, NL;
Abstract
An active noise reduction system for reducing the acoustic noise generated by a hard disk drive or generated external of a hard disk drive. The active noise reduction system is integrated into the hard disk drive and produces an acoustic waveform that is 180 degrees out-of-phase with the acoustic noise being generated, for example, by the spindle motor and VCM. The acoustic noise is received directly through a microphone or indirectly through the read/write head, spindle motor driver, or VCM driver. The acoustic noise is processed by electronics and the noise canceling waveform is either retrieved from the hard disk drive's memory, disk, or generated by the electronics. The noise canceling waveform is then broadcasted through one or more transducers that are integrated in the hard disk drive.