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:
Jun. 27, 1995
Filed:
Sep. 03, 1993
Steven L Gay, Long Valley, NJ (US);
AT&T Corp., Murray Hill, NJ (US);
Abstract
A fast affine projection adaptive filter capable of frequent parameter updating and fast convergence with low complexity. The invention mitigates affine projection adaptive filter complexity due to matrix inversion and the fact that a given excitation vector is weighted and summed into the adaptive coefficient vector many times. Embodiments of the invention achieve fast convergence through sample by sample updating and the exploitation of the shift invariant property of the excitation signal. Complexity is further reduced by a vector update procedure in which a given excitation vector is weighted and added into the coefficient estimate only once. Three illustrative embodiments are presented. The first of these is a relaxed adaptive filter, the second is an adaptive filter without relaxation and a third is an adaptive filter with suspended adaptation. The embodiments are presented in the context of electrical and acoustic echo cancellation.