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:
Jul. 10, 2012
Filed:
Apr. 28, 2006
Masashi Takada, Tokyo, JP;
Masashi Takada, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
An echo canceller, in which an adder adds a pseudo echo generated by an adaptive filter to an echo, so that the echo and the pseudo echo are canceled to each other, includes: a subband filter () and a sampling converter () for downsampling an audio signal; a selector switch () which appropriately switches between a side performing the downsampling and another side performing fullband echo cancellation; and a tap arrangement controller () which optimizes a tap arrangement by using coefficients which are updated using a downsampled signal by the adaptive filter (), the tap arrangement controller outputting the optimized tap arrangement to the adaptive filter () at time of the fullband echo cancellation.