ALEXANDRIA, Va., June 19 -- United States Patent no. 12,334,876, issued on June 17, was assigned to SIGMASTAR TECHNOLOGY LTD. (Fujian, China).
"Audio player device and startup method thereof" was invented by Cheng-Qi Huang (Shanghai), Zhun Chen (Shanghai) and Zhong-Yuan Wan (Shanghai).
According to the abstract* released by the U.S. Patent & Trademark Office: "An audio player device includes a digital-to-analog converter (DAC), a startup circuit, a multiplexer and an output amplifier. The DAC converts audio data into a first signal and a second signal. The startup circuit gradually increases a level of a startup voltage according to a reference voltage during a predetermined period. The multiplexer outputs the startup voltage as a control...