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:
Mar. 14, 2017
Filed:
Jun. 25, 2013
Applicant:
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Inventors:
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G10K 11/16 (2006.01); H03B 29/00 (2006.01); A61F 11/06 (2006.01); H04R 3/02 (2006.01); G10K 11/178 (2006.01); H04R 3/00 (2006.01);
U.S. Cl.
CPC ...
H04R 3/02 (2013.01); G10K 11/178 (2013.01); G10K 11/1784 (2013.01); H04R 3/00 (2013.01); G10K 2210/1282 (2013.01); G10K 2210/3054 (2013.01); G10K 2210/3055 (2013.01); H04R 2460/01 (2013.01); H04R 2499/13 (2013.01);
Abstract
An active noise reduction device is used with a secondary noise source that generates a secondary noise and an error signal source that outputs an error signal corresponding to a residual sound caused by interference between the secondary noise and a noise. A μ-adjustment unit calculates a step-size parameter for updating a filter coefficient of an adaptive filter by multiplying a standard step-size parameter by a ratio of a standard representative input value corresponding to amplitude of a signal to a representative input value corresponding to the amplitude of the signal.