| 摘要 |
PURPOSE:To prevent the faulty heating due to noise by converting voice to a low-frequency electric signal-without using an external microphone. CONSTITUTION:The vibration of the eardrum is transmitted to the vibration membrane of an earphone in the closed area between the earphone inserted in an earhole and the eardrum, and a low-frequency electric signal is generated in a moving coil fixed to the vibration film. Even with a ear-splitting surrounding noise, it is hard to enter in the closed area, and the vibration of the eardrum due to the voice of a user is converted into a low-frequency electric signal without noise. Thus, the adverse effect due to the surrounding noise can be prevented. |
