ALEXANDRIA, Va., June 5 -- United States Patent no. 12,278,653, issued on April 15, was assigned to Nippon Telegraph and Telephone Corp. (Tokyo).
"Delta sigma modulator" was invented by Naoki Terao (Tokyo), Munehiko Nagatani (Tokyo) and Hideyuki Nosaka (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A delta sigma modulator includes: an integrator that integrates differences between input signals and output signals of the delta sigma modulator; and a clocked comparator that outputs the output signals that are results of comparison between an output of the integrator and a threshold, at a timing synchronized with a clock signal. The integrator includes an operational amplifier, input resistors, feedback ...