| 摘要 |
PURPOSE: An earphone microphone is provided to prevent echo and howling phenomena by arranging an output terminal of a speaker and an input terminal of a microphone in the same direction. CONSTITUTION: A speaker(220) outputs a voice signal. A microphone(230) converts the voice signal into an electric signal. A sound absorbing material is formed to arrange the speaker and the microphone. The input terminal of the microphone and the output terminal of the speaker are arranged in the same direction. A first penetration groove of the sound absorbing material transmits the voice signal outputted from the output terminal to an external auditory canal. A second penetration groove of the sound absorbing material inputs the voice signal from the external auditory canal to the input terminal. The speaker and the microphone are arranged in parallel. |
