ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,424,994, issued on Sept. 23, was assigned to REALTEK SEMICONDUCTOR CORP. (Hsinchu, Taiwan).
"Amplifier system" was invented by Chen-Fong Liao (Hsinchu, Taiwan) and Yi-Chang Tu (Hsinchu, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An amplifier system includes an output circuit, a processor circuit, a feedback circuit, and a controller circuit. The output circuit outputs an output signal and returns a digital output feedback signal. The processor circuit receives a filtered error audio signal and outputs a pulse width modulation control signal to the output circuit. An addition unit of the feedback circuit adds the negative value of the digital...