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. 08, 2003
Filed:
Sep. 30, 1999
Yoshihiro Ariyama, Tokyo, JP;
OKI Electric Industry Co., Ltd., Tokyo, JP;
Abstract
An echo canceller having an adaptive algorithm for canceling an echo signal comprises an adaptive filter, a renewal controller and an initial operation controller. The adaptive filter generates a pseudo echo signal by renewing tap coefficients based on a far-end input signal, a near-end input signal and a residual signal, the renewal controller determines a time average of a renewal amount for each tap coefficients and estimates an initial delay of the echo signal by detecting the time average indicating a maximum renewal amount. The initial operation controller operates the adaptive filter to perform an initial operation to eliminate the tap coefficients corresponding to the initial delay of the echo signal and to renew the remaining tap coefficients corresponding to the echo signal.
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