ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,444,431, issued on Oct. 14, was assigned to Amazon Technologies Inc. (Seattle).
"Microphone reference echo cancellation" was invented by Carlos Renato Nakagawa (San Jose, Calif.), Ludger Solbach (San Jose, Calif.) and Robert Ayrapetian (Morgan Hill, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "Techniques for improving microphone noise suppression are provided. When a playback signal is available, a device may use the playback signal as a reference while performing Acoustic Echo Cancellation (AEC) processing. When the playback signal is not available, the device may instead use microphone audio signal(s) as the reference while performing Adaptiv...