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:
Mar. 17, 2015
Filed:
Apr. 22, 2010
Anders Eriksson, Uppsala, SE;
Per Ahgren, Knivsta, SE;
Anders Eriksson, Uppsala, SE;
Per Ahgren, Knivsta, SE;
Telefonaktiebolaget L M Ericsson (publ), Stockholm, SE;
Abstract
The present invention relates to an echo canceller () for estimating a model of an echo signal and a method thereof. The echo canceller comprises at least an adaptive main filter () for modeling the echo signal and an adaptive shadow filter () for modeling the echo signal. The adaptive main filter is an adaptive filter for which the adaptation speed is proportional to a system noise estimate and the adaptation speed of the shadow filter () is faster than the adaptation speed of the adaptive main filter (). The echo canceller () comprises a processor () for determining whether the adaptive shadow filter models the echo signal better than the adaptive main filter and an updater () for updating the system noise estimate of the adaptive main filter () if the adaptive shadow filter models () the echo signal better than the adaptive main filter ().