ALEXANDRIA, Va., Nov. 6 -- United States Patent no. 12,463,608, issued on Nov. 4, was assigned to ALPS ALPINE Co. LTD. (Tokyo).
"Sound output device" was invented by Minoru Matsuyama (Fukushima, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A sound output device of the present disclosure includes a controller, a power amplifier, a low-pass filter, and a speaker. The controller includes first and second low-pass filters configured to remove high-frequency components of a sound input signal and a sound output signal, a first peak detection unit configured to detect a peak current of the sound input signal from which the high-frequency component has been removed, a second peak detection unit configured t...