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:
Sep. 07, 2010
Filed:
Jan. 27, 2005
Renee Johnston, Dunrobin, CA;
Mirjana Popovic, Ottawa, CA;
Dieter Schulz, Dunrobin, CA;
Jan Radecki, Ottawa, CA;
Renee Johnston, Dunrobin, CA;
Mirjana Popovic, Ottawa, CA;
Dieter Schulz, Dunrobin, CA;
Jan Radecki, Ottawa, CA;
Mitel Networks Corporation, Ottawa, Ontario, CA;
Abstract
The present invention relates generally to tone detection in echo canceling systems, and more particularly to a method of monitoring oscillations of adaptive filter coefficients for narrow band tone detection in echo cancellation systems. The invention is directed at improving communication in a telephone communication network having one or more hybrid connections. A method for detecting continuous tones in an echo canceling system having an adaptive filter is provided. Continuous tones have a deleterious effect on the performance of adaptive filters. In the present invention, the adaptive filter coefficients are monitored. Oscillation of those coefficients indicates continuous tone presence.