| 摘要 |
PROBLEM TO BE SOLVED: To exactly listen to sounds even when a sound source is far away by converting sound vibrations to electric signals, changing these signals to optical signals and transmitting them. SOLUTION: A microphone 2 has a microphone part 3, transmission circuit part 4 and transmission part 5 and concerning the sound inputted to the microphone part 3, its sound vibrations are changed to electric signals by the transmission circuit part 4. Then, these electric signals are converted to optical signals by the transmission part 5. Therefore, a light emitting diode(LED) 6 is fitted to the transmission part 5 and the optical signals are transmitted through the LED 6. Heads 10 equipped with speakers 9 at both the ends of a link part 8 almost formed in the inverse of U are fitted to a headphone 1. The heads 10 have a dry battery and are provided with a reception circuit part 11, and the reception circuit part 11 has a light receiving element 12. The optical signal transmitted from the microphone 2 is inputted to the light receiving element 12, changed to the electric signal by the reception circuit part 11, further changed to an audio signal and guided to the speaker 9. |
