| 摘要 |
In order to improve receiver sensitivity of an earphone using a cable as an antenna, in the present invention, the earphone includes a cable, an antenna wire ANT incorporated in the cable, signal wires R and L incorporated in the cable with the antenna wire ANT, a plug 32 provided to the cable and electrically connecting the antenna wire ANT and the signal wires R and L to a portable telephone 1, a remote control 33 provided to the cable and disposed in spaced relationship with plug 32, a high-frequency attenuation element 5C incorporated in the remote control 33, and arranged in the signal wires R and L, and a high-frequency attenuation element 5B incorporated in the remote control 33 and arranged in the antenna wire ANT so as to be located adjacent to the high-frequency attenuation element 5C. The high-frequency attenuation elements 5B and 5C are located on a position in the remote control 33, which is closer to the plug 32.
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