ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,477,275, issued on Nov. 18, was assigned to FOSTER ELECTRIC COMPANY Ltd. (Tokyo).
"Speaker device and acoustic system" was invented by Takeshi Yamamoto (Akishima, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A speaker device includes: a limiting unit that limits a signal band of a sound source signal that has been input; a speaker unit that includes a diaphragm; a housing that houses the speaker unit; and a drive circuit that, based on the sound source signal with the limited signal band, outputs a control signal that causes the diaphragm of the speaker unit to vibrate, wherein: the limiting unit limits the sound source signal to a frequency ban...