ALEXANDRIA, Va., Nov. 3 -- United States Patent no. 12,778,539, issued on Nov. 3, was assigned to Amazon Technologies Inc. (Seattle).
"Audio sleep monitoring system and method" was invented by Guangji Shi (San Jose, Calif.), Trausti Thor Kristjansson (San Jose, Calif.) and Anran Wang (Seattle).
According to the abstract* released by the U.S. Patent & Trademark Office: "An audio enabled device comprising a microphone array and loudspeaker can detect user respiration for sleep analysis if enabled by a user. The loudspeaker emits ultrasound audio signals which are captured by the microphone(s) and processed with respect to a reference signal to determine when the user's chest is moving and thus detecting the user's respiration. The device ma...