ALEXANDRIA, Va., Aug. 26 -- United States Patent no. 12,401,330, issued on Aug. 26, was assigned to ROHM Co. LTD. (Kyoto, Japan).
"Audio circuit" was invented by Mitsuteru Sakai (Kyoto, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A class D amplifier circuit receives an analog audio signal with a first reference voltage as its center level, and outputs an output pulse signal having a duty cycle that corresponds to the analog audio signal. A bias circuit generates a second reference voltage having a voltage level obtained as a division of the first reference voltage and the power supply voltage. A periodic voltage generating circuit of the class D amplifier circuit generates a periodic voltage having ...