ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,490,041, issued on Dec. 2, was assigned to Sonos Inc. (Goleta, Calif.).
"Sum-difference arrays for audio playback devices" was invented by Hilmar Lehnert (Framingham, Mass.) and Paul MacLean (Quincy, Mass.).
According to the abstract* released by the U.S. Patent & Trademark Office: "In some embodiments, a method comprises receiving audio content comprising left input channel signals and right input channel signals, and generating first and second input signals from the left and right input channel signals. The first input signal is based on a sum of the left and right input channel signals, and the second input signal is based on a difference of the left and right input channel signal...