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:
May. 29, 2007
Filed:
Mar. 25, 2003
Shinichi Koike, Tokyo, JP;
Shinichi Koike, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
An adaptive filter, employing an adaptively controlled forgetting factor, includes a first circuit for determining a gradient of an error signal and a second circuit for determining a value of the forgetting factor. The value of the forgetting factor is updated based on comparing the gradient of the error signal to the forgetting factor. Equations to update the forgetting factor may be solved using a recursive least squares algorithm. Comparing the gradient of the error signal to the forgetting factor may include, for example, dividing the error signal gradient by a compliment of the forgetting factor. A method for updating the forgetting factor includes determining the gradient of the error signal, determining a value of the forgetting factor, and updating the value of the forgetting factor based on comparing the gradient of the error signal to the forgetting factor. The forgetting factor may be stored in the adaptive filter.