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:
Jun. 21, 2016
Filed:
Mar. 27, 2014
Rawles Llc, Wilmington, DE (US);
Kurt Wesley Piersol, San Jose, CA (US);
Preethi Parasseri Narayanan, Cupertino, CA (US);
Robert Ayrapetian, Morgan Hill, CA (US);
Arnaud Jean-Louis Charton, Livermore, CA (US);
Gabe Beddingfield, Fremont, CA (US);
Michael Alan Pogue, Sunnyvale, CA (US);
Yuwen Su, Cupertino, CA (US);
Amazon Technologies, Inc., Seattle, WA (US);
Abstract
A system may be configured to interact with a user through speech using a first and second audio devices, where the first device produces audio and the second device captures audio. The second device may be configured to perform acoustic echo cancellation with respect to a microphone signal based on a reference signal provided by the first device. The reference and microphone signals may have the same nominal signal rates. However, the signal rates may drift from each other over time. In order to synchronize the rates of the signals, each of the devices maintains a signal index. The second device compares the values of the two signal indexes over time to determine rate differences between the reference and microphone signals and then corrects for the rate differences.