Acoustic communication system using bone conduction elements
Kenji Muto, Guoyue Chen, Kunihiko Takano, Kikuo Asai, Kimio Kondo · The Journal of the Acoustical Society of America · 2006
This study examines an acoustic communication system constructed using a bone conduction speaker and a bone conduction microphone. This system is a headset that places a bone conduction speaker to the user’s cheek, and a bone conduction microphone to the other cheek. A user can thereby hear a voice through the bone conduction speaker while hearing a voice of a loudspeaker and surrounding noise when using it for teleconferencing. It can transmit the voice of the remote loudspeaker using the external ear, but the user can hear the translated voice through bone conduction. However, the sound of the bone conduction speaker and the surrounding sound are mixed with the speaker’s voice using the bone conduction microphone. The vibration level of the bone conduction microphone from the bone conduction speaker was about 0 dB, although it was the same level as the level of the speaker’s voice. The vibration level from surrounding sound was about −3 dB, although it was a smaller level than the level of the speaker’s voice. This device removed mixed sounds using the echo canceller [K. Muto et al., Proc. Inter-noise (2004), p. 248]. The echo elimination level was about 12 dB. [This work was supported by JSPS KAKENHI 17300283.]