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. 11, 2009
Filed:
Nov. 08, 2005
Toshiyuki Funayama, Osaka, JP;
Yoshio Nakamura, Osaka, JP;
Masahide Onishi, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An active noise controller can determine the signal transmission characteristics from the power amplifier and the speaker to the microphone without using any special external measuring instrument and calculate a cosine correction value and a sine correction value without using an external computer. The active noise controller uses the cosine correction value and the sine correction value to actively reduce vibrational noise. The measurement mode is selected on touch panel (), and correction value calculator () calculates cosine correction value Cand sine correction value Cby using filter coefficients Wand Wwhich allow error signal e'(n) to approach zero. Memory () stores these values Cand C