ALEXANDRIA, Va., Aug. 6 -- United States Patent no. 12,381,585, issued on Aug. 5, was assigned to ADVANTEST Corp. (Tokyo).
"Signal generator" was invented by Koji Asami (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "N (Nless than=2) D/A converters convert respective input data at a sampling frequency FS. A digital signal processing unit generates N items of sub-band waveform data. Each of N items of sub-band waveform data is generated by frequency-shifting corresponding one of N sub-band components included in digital waveform data that represents the analog output signal, such that each sub-band waveform data has its maximum frequency below FS/2. A local signal generating circuit generates N local si...