| 摘要 |
PROBLEM TO BE SOLVED: To achieve, at unprecedented low cost, a wireless earphone for a case when a domestic television or stereo system is used. SOLUTION: A commercially-available commodity called an FM transmitter is brought to attention. The FM transmitter is originally an automobile appliance, and allows sound of a portable CD player, an MD player and a music player to be heard through the FM transmitter if only an FM radio exists. When the FM transmitter is replaced with usage in a home, a pin jack of the FM transmitter is plugged in a headphone terminal of a television or a stereo system, and thereby this wireless earphone can be inexpensively provided by using a portable FM radio as a receiver. COPYRIGHT: (C)2011,JPO&INPIT
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