| 摘要 |
PROBLEM TO BE SOLVED: To provide a microphone having a degree of sound quality, such as recognizable characteristic of a voice of a talker and clear articulation resulting that it is identified who is speaking as an ordinary microphone of air conduction type, by solving the problems of conventional earhole microphones or enclosed vibration microphones, in which the conventional earhole microphone or enclosed vibration microphone can be used under noise or vibration, but the sound quality of a talker's voice deteriorates, muffled voice is caused, it cannot be identified who is talking due to echoed voice or the hardly heard voice, identification of the talker is put to secondary, importance, and communication of facts is conducted under noise and vibration. SOLUTION: The enclosed case senses vibration, caused by sound from a vocal cord and the sound is transduced into a voice signal. In this case, a high frequency voice band of the voice is always lower. In order to compensate for this, first excessively high frequency sound outputted from the piezoelectric ceramic is adjusted, by narrowing upper and lower air chambers, addition of vibration transmission and control components, depending on applications can adjust the output so as to enhance the sound quality, the vibration coil of a dynamic speaker unit is used to assist the vibration of the ceramic or an audio signal amplifier circuit is used to obtain the sound quality close to that of an ordinary microphone of air conduction type.
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