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. 03, 2013
Filed:
Sep. 04, 2008
Asif Iqbal Mohammad, San Diego, CA (US);
Steven L. Grant, Rolla, MO (US);
Heejong Yoo, San Diego, CA (US);
Deepak Kumar Challa, San Diego, CA (US);
Asif Iqbal Mohammad, San Diego, CA (US);
Steven L. Grant, Rolla, MO (US);
Heejong Yoo, San Diego, CA (US);
Deepak Kumar Challa, San Diego, CA (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
An echo canceller for improved recognition and removal of an echo from a communication device. The echo canceller can dynamically reduce echo using an improved energy estimator and an improved adaptive filter. The improved energy estimator can determine if conversation is in a single talk period or a double talk period based on the combined energy of both the near end background noise and speech. The improved adaptive filter can reduce echo by dynamically changing adaptation speed or step size. In double talk, the adaptive filter(s) can dynamically slow-down or stop adaptation. In single talk, the filter can dynamically increase the speed of adaptation to improve accuracy, or decrease adaptation speed for stability.