| 摘要 |
PROBLEM TO BE SOLVED: To dispense with removing earphone, even if there is an incoming call during listening to music. SOLUTION: Reproduced voice that is reproduced by a music reproduction apparatus is input to a variable gain amplifier 34 and a monitor circuit 36 via an input terminal 30. An infrared signal carrying received voice is input from a mobile terminal to a light-emitting element 32. A demodulator 40 demodulates an output electrical signal of a light-receiving element 32 to reproduce a voice signal, and informs a central processor unit 38 of a demodulating state and a result. Under the control by the central processor unit 38, the variable gain amplifier 34 amplifies the voice signal from the speech input terminal 30, and a variable gain amplifier 42 amplifies the voice signal from the demodulator 40. A mixer 44 mixes the output voice signals of the variable gain amplifiers 34 and 42 and outputs the mixed voice signals to a loudspeaker 22. When voice input is notified from the demodulator 40, the central processor unit 38 lowers the gain of the variable gain amplifier 34 or sets it to zero. COPYRIGHT: (C)2007,JPO&INPIT
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