MUTING DEVICE

摘要

In order to enable noises entering the ear from random directions to be muted without wearing headphones, this muting device is provided with: a super-directional microphone that detects noises in spot areas around the ear at pinpoints; and an ultrasonic speaker that modulates and outputs a carrier signal supplied by a transmitter according to noise signals detected by the super-directional microphone. Furthermore, an adaptive filter is provided, and the adaptive filter supplies noise signals with the opposite phase to noises detected by the super-direction microphone, and transmits an ultrasonic signal from the ultrasonic speaker toward the eardrum of a human.

主权项

1. A muting device comprising:
a super-directional microphone that detects noises in spot areas around the ear at pinpoints; an adaptive filter that inputs a noise signal outputted by the super-directional microphone and outputs a signal with a phase opposite to that of the noise signal; and an ultrasonic speaker that modulates a carrier signal in an ultrasonic band outputted by an oscillator with the signal of the adaptive filter to generate an ultrasonic wave toward the ear.