| 摘要 |
PURPOSE: An ear microphone is provided to prevent echo and howling phenomena by completely separating a sealing type magnetic balance speaker from a directional microphone. CONSTITUTION: A connector(1100) is combined with an external device. A controller(1200) includes a noise level auto sensing switch. The noise level auto sensing switch selective provides a voice signal inputted from a first microphone or second microphone to the connector according to the level of the voice signal. An earphone(1300) includes a first earphone unit with a first sealing type magnetic balance speaker and a second earphone unit with a fist microphone. The controller controls the noise level auto sensing switch which selects the first or second microphone. |
