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:
Nov. 28, 2017
Filed:
Dec. 05, 2016
Applicant:
Amazon Technologies, Inc., Seattle, WA (US);
Inventors:
Robert Ayrapetian, Morgan Hill, CA (US);
Michael Alan Pogue, Sunnyvale, CA (US);
Kenneth Edgar Hild, II, Cupertino, CA (US);
Assignee:
Amazon Technologies, Inc., Seattle, WA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B 3/20 (2006.01); H04R 3/00 (2006.01);
U.S. Cl.
CPC ...
H04R 3/002 (2013.01);
Abstract
A multi-channel echo cancellation system that dynamically adapts to changes in acoustic conditions. The system does not require a sequence of 'start-up' tones to determine the impulse responses. Rather, the adaptive filters approximate estimated transfer functions for each channel. A secondary adaptive filter adjusts cancellation to adapt to changes in the actual transfer functions over time after the adaptive filters have been trained, even if the reference signals are not unique relative to each other.