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:
Dec. 28, 2010
Filed:
Feb. 01, 2007
Youhong LU, Vernon Hills, IL (US);
Glenn Kosteva, Westford, MA (US);
Jenny Jianqiu Jin, Natick, MA (US);
Nick Georgacopoulos, Lowell, MA (US);
Youhong Lu, Vernon Hills, IL (US);
Glenn Kosteva, Westford, MA (US);
Jenny Jianqiu Jin, Natick, MA (US);
Nick Georgacopoulos, Lowell, MA (US);
Hewlet-Packard Company, Palo Alto, CA (US);
Abstract
A method and system in network switch for cancelling multiple sources of network echo, including echo that is combined with a persistent, non-echo signal. A first echo canceller cancels a first echo signal that arises from an echo path in the network switch, and second echo canceller cancels a second echo signal that arises from an echo path in an external network device. The first echo canceller operates by first removing any persistent, non-echo signal that may be combined with the first echo signal, then training on the remaining, pure echo signal. The second echo canceller includes two sub-component echo cancellers that are coordinated so as to provide a minimum error signal for cancellation applied to the second echo signal.