09747920 is referenced by 21 patents and cites 10 patents.

An echo cancellation system that performs audio beamforming to separate audio input into multiple directions and determines a target signal and a reference signal from the multiple directions. For example, the system may detect a strong signal associated with a speaker and select the strong signal as a reference signal, selecting another direction as a target signal. The system may determine a speech position and may select the speech position as a target signal and an opposite direction as a reference signal. The system may create pairwise combinations of opposite directions, with an individual direction being selected as a target signal and a reference signal. The system may select a fixed beamformer output for the target signal and an adaptive beamformer output for the reference signal, or vice versa. The system may remove the reference signal (e.g., audio output by the loudspeaker) to isolate speech included in the target signal.

Title
Adaptive beamforming to create reference channels
Application Number
14/973274
Publication Number
9747920 (B2)
Application Date
December 17, 2015
Publication Date
August 29, 2017
Inventor
Philip Ryan Hilmes
San Jose
CA, US
Robert Ayrapetian
Morgan Hills
CA, US
Agent
Pierce Atwood
Assignee
AMAZON TECHNOLOGIES
WA, US
IPC
G10L 21/0208
H04R 5/04
G10L 21/0216
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