| 摘要 |
PROBLEM TO BE SOLVED: To respond to an incoming call and make a call while headphones are put on. SOLUTION: A headphone type portable telephone set 1 is mounted on the head of a user and outputs a playback audio signal (e.g. music) from an MD player 2. This headphone type portable telephone set 1 has, what is called, an audio signal output function using ordinary headphones. Further, the headphone type portable telephone set 1 has what is called, the calling function of an ordinary telephone set capable of making a call to a terminal 5 connected to a telephone network 4 by communicating with a base station 3 by radio.
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