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:
Feb. 17, 2004
Filed:
Aug. 26, 1999
Applicant:
Inventor:
Wei-jei Song, Aliso Viejo, CA (US);
Assignee:
Nortel Networks Limited, St. Laurent, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M 9/08 ;
U.S. Cl.
CPC ...
H04M 9/08 ;
Abstract
A communication device and method for detecting an infinite return loss (IRL) condition and temporarily halting or bypassing operations of an echo canceller in response to detecting that condition. The echo canceller includes an IRL detection module that analyzes the echo return loss and the echo return loss enhancement measured from the far-end and near-end signals. Based on the analysis, the IRL detection module determines whether to bypass the subtraction of the estimated echo in the outgoing near-end signal or continue normal operations.