US Patent Issued to Sonos on July 21 for "Ultrasonic transmission for presence detection" (British, American Inventors)

ALEXANDRIA, Va., July 21 -- United States Patent no. 12,687,624, issued on July 21, was assigned to Sonos Inc. (Santa Barbara, Calif.).

"Ultrasonic transmission for presence detection" was invented by Daniel Jones (London), Richard Bannon (Seattle), Jake Harwood (Seattle), Jonathan Herbst (Seattle) and Henry Sia (Seattle).

According to the abstract* released by the U.S. Patent & Trademark Office: "An example involves detecting, during a time period by a receiving device, an audio signal comprising a superposition of a plurality of audio signals transmitted by a plurality of respective playback devices. The example further comprises determining a time-frequency representation of the audio signal and obtaining data associating playback devi...