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:
Sep. 18, 2012
Filed:
May. 31, 2007
Miki Sato, Minato-ku, JP;
Miki Sato, Minato-ku, JP;
NEC Corporation, Tokyo, JP;
Abstract
A noise cancelling device for detecting divergence of a coefficient of an adaptive filter without setting a threshold value in advance based on characteristics of a device from which noise is to be cancelled or an environment. The noise cancelling device includes: a divergence coefficient unit for obtaining a filter divergence coefficient from a filter coefficient of a section not including a filter coefficient at a basic tap position decided by the distance between a reference input unit and an audio input unit; a divergence threshold value calculation unit for obtaining a filter divergence threshold value from a filter coefficient of a section including the filter coefficient at the basic tap position; and a divergence detection unit for comparing the filter divergence coefficient to the filter divergence threshold value so as to detect the divergence condition of the adaptive filter.