| 摘要 |
PROBLEM TO BE SOLVED: To transmit an actual sound (noise) when the noise level exceeds a regulation standard. SOLUTION: In a noise detection unit 1, the noise level of a noise is measured through a microphone 5 and a noise meter 6 and inputted into a radio equipment 7. The actual sound thereof is inputted into a PHS 10 through a microphone 8 and a microphone amplifier 9. In a noise monitoring unit 2, a PC 14 communicates with the radio equipment 7 of each noise detection unit 1 through a radio equipment 13, acquires the noise levels measured in each unit, determines whether the noise level exceeding the regulation standard exists or not, and, when existing, allows a PHS 15 to call the PHS 10 of the noise detection unit 1, and establishes communication with the PHS 10. In this case, a safety foreman 4 can hear the actual sound from the PHS 15. The actual sound is recorded by an MD recorder.
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