1, the work used to monitor the noise of the outside, through external sound sensors to monitor the external voice signals; 2, when the external noise intensity exceeds a certain intensity, and the noise lasts for a certain time, the microcontroller will output a trigger signal to the sound broadcast module; 3, and then the sound broadcast module will be triggered and alarm, so as to achieve the purpose of alarm reminder.

公共场所声音监视器\一种用于公共场所的声音监视器.docx
公共场所声音监视器\公共场所声音监视器.txt
公共场所声音监视器

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