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. 23, 2002
Filed:
Nov. 10, 1998
Applicant:
Inventor:
Wei-jei Song, Aliso Viejo, CA (US);
Assignee:
Nortel Networks Limited, St. Laurent, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B 3/20 ;
U.S. Cl.
CPC ...
H04B 3/20 ;
Abstract
An echo canceler including a processor to adjust a dynamic clipping amplitude threshold for use in determining whether or not to clip outgoing audio. The dynamic clipping amplitude threshold is increased when the ratio of residue echo over echo is decreased over a prescribed period of time. The residue echo is taken as a difference between a true echo and an estimated echo initially emulated by the echo canceler. Likewise, when this ratio is increased over the prescribed period of time, the dynamic clipping amplitude threshold is decreased.