| 摘要 |
PURPOSE:To secure speech transmission and reception in a noisy environement by a bone conduction type microphone to be inserted into one ear, an earphone to be inserted into the other ear and covers that cut off a sound conducted through bones to the earphone. CONSTITUTION:Into the right ear, ear-hole type microphone 1 is inserted. Microphone 1 is inserted up to the circumference of eardrum 2 to pick up the vibration of the eardrum through bone conduction. Lead wire 3 from microphone 1 is connected to ratio transmitter 5. Into the left ear, ear-hole type earphone 11 is inserted. Earphone 11 is supplied with a received sound from radio receiver 13 via laed wire 14. Sound-insulating covers 9 and 15 are provided which cover the entire ears 6 including temporal bone part 7 and cheekbone part 8 sufficiently. Consequently, clear speech transmission and reception can be attained in a noisy environment. |
