ALEXANDRIA, Va., Dec. 9 -- United States Patent no. 12,494,820, issued on Dec. 9, was assigned to ALLWIN NETWORK Co. LTD (New Taipei, Taiwan).

"Digital signal coding and decoding method, digital broadcasting system and digital telephone exchange system" was invented by Wu-Hsun Kuo (New Taipei, Taiwan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A digital signal coding and decoding method, a digital broadcasting system, and a digital telephone exchange system are provided. The digital signal coding and decoding method includes providing a direct current signal; and providing a first direction indication signal and a second direction indication signal on the direct current signal according to each digital si...