ACTIVE NOISE REDUCTION DEVICE FOR ROLLING STOCK

摘要

PROBLEM TO BE SOLVED: To provide an effective and sure active noise reduction device for a rolling stock even in a variable magnetic field. SOLUTION: This device has a vibration detector detecting vibrations of a panel, a piezoelectric plane loudspeaker installed adjacent to the panel, and a drive part driving the piezoelectric plane loudspeaker based on electric signals inputted from the vibration detector. In this piezoelectric plane loudspeaker, a face radiating noises of a reverse phase is directed to the panel. COPYRIGHT: (C)2004,JPO&NCIPI