| 摘要 |
A noise level indicator in the form of a traffic light having respective red, yellow, and green lights. The noise level indicator receives ambient noise through a built-in microphone and compares the ambient noise level against a predetermined acceptable decibel level. The noise level indicator shows whether the ambient noise level is below, at, or above the predetermined acceptable decibel level by respectively illuminating the green, yellow, or red light. The red light can be accompanied by an audible siren, and the yellow light flashes to call attention to borderline and unacceptable ambient noise levels.
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