| 摘要 |
When an incoming call is received, a control unit confirms using an open/close sensor whether or not a mobile terminal device is in the close state. When the mobile terminal device is folded, the control unit establishes a communications state, changes the amplification rate of a first amplifier such that the reception signal can be output at the sound level predetermined as the level to be output from the receiver, changes the signal path so that the received voice can be output from the speaker by operating a switch, and changes the transmitted voice sensitivity by adjusting the amplification rate of a second amplifier so that the microphone can collect sound although it is separate from the mouse of the user, thereby realizing the conversation with the mobile terminal device folded.
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