US Patent Issued to Alps Alpine on July 8 for "Speaker displacement detection calibration method and speaker displacement detection apparatus" (Japanese Inventor)

ALEXANDRIA, Va., July 9 -- United States Patent no. 12,356,145, issued on July 8, was assigned to Alps Alpine Co. LTD. (Tokyo).

"Speaker displacement detection calibration method and speaker displacement detection apparatus" was invented by Ryosuke Tachi (Fukushima, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A magnetic angle sensor outputs a component Vs in a Y direction where a vibration system of a synthetic vector of a magnetic vector of a magnetic circuit of a speaker and a magnetic vector of a displacement detection magnet fixed on the vibration system and a component Vc in an X direction orthogonal to the Y direction. A test signal is applied to the speaker, and collection of (Vs, Vc) and a m...