ALEXANDRIA, Va., June 5 -- United States Patent no. 12,276,741, issued on April 15, was assigned to Amazon Technologies Inc. (Seattle).
"Direction of arrival estimation" was invented by Spencer Russell (Quincy, Mass.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A system configured to determine an estimated angle of arrival in reverberant environments. When a first device detects a calibration tone generated by a second device, the first device may generate multichannel audio representing the calibration tone and process the multichannel audio using a combination of detection filtering and subspace processing to determine a relative direction of the second device. For example, the first device may perform m...