ALEXANDRIA, Va., Jan. 29 -- United States Patent no. 12,212,937, issued on Jan. 28, was assigned to Sonos Inc. (Santa Barbara, Calif.).
"Calibration state variable" was invented by Dayn Wilberding (Portland, Ore.) and Neil Griffiths (Santa Barbara, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "Example techniques involve a calibration state variable. An example implementation receives, via a network interface, an indication that the first playback device is calibrated. Based on receiving the indication that the first playback device is calibrated, the example implementation updates a calibration state variable to indicate that the first playback device is calibrated, wherein the calibration state vari...