| 摘要 |
PURPOSE:To prevent a voice reflected in an ear drum from being reflected and listened to toward the eardrum again by forming one end of the acoustic tube formed to have nearly the same inner diameter as that of an external auditory meatus as an ear mount part and forming the other end as a voice resistive termination. CONSTITUTION:The acoustic tube 1 is formed to have nearly the same inner diameter (w) as an inner diameter w0 of the external auditory meatus A and a speaker unit 2 is mounted to one end of the acoustic tube 1 while a sounding face 2a is faced the inside of the tube. Then the ear mount member 4 to be mounted to an entrance C of the external auditory meatus A is fitted to one end of the acoustic tube 1, while the other end of the acoustic tube 1 is used as a resistive termination for voice. Thus, the incident sound is not reflected at the other end of the acoustic tube 1 again toward the eardrum B. |
