| 摘要 |
PROBLEM TO BE SOLVED: To provide an earphone conversion adaptor provided with an antenna function which receives broadcast signals in an excellent state. SOLUTION: The earphone conversion adaptor 1 has a device connector 10 which connects an audio/video receiver to one edge, and an earphone connector 11 which connects an earphone to another edge. An antenna 12 is provided inside of the earphone conversion adaptor 1 so that a housing of the audio/video receiver is not included in an electric-field oriented area of the antenna 12, and a resonance frequency of the antenna 12 can be changed to a broadcast frequency based on control signals which control the resonance frequency. COPYRIGHT: (C)2009,JPO&INPIT
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