| 摘要 |
PROBLEM TO BE SOLVED: To easily obtain sound that does not include noise and is easy to listen in a device for transmitting the sound from a sound source in a cordless way and reproducing the sound near a listener a part from the sound source. SOLUTION: An output from a low sensitivity microphone attached to the sound source is transmitted in a cordless way and demodulated and reproduced into the sound near the listener who listens to the sound. A sound level collected by the microphone is detected and informed, and the microphone is fixed to an appropriate position to the sound source on the basis of this information.
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