| 摘要 |
A system for determining the condition of a traffic controlling semaphore has an audio sensor mounted in the vicinity of an intersection so the sound level is monitored at all times. A computer is placed into the semaphore controller, and the computer receives the audio signal, a time signal, and a signal representing the status of the semaphore. When a sound is detected above a certain minimum level, which is above the usual traffic noise, a record is generated by the computer, and recorded in permanent form, perhaps printed on paper. The record includes the date, time, and status of the semaphore.
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