For the problem that noise monitoring instruments on the market have the disadvantages of complicated circuit design, difficult debugging, and large power consumption, an all-digital individual noise exposure protection device is designed. The device uses a MEMS digital microphone with a pulse density modulation（PDM） interface to collect noise and replaces analog circuits with digital operations, reducing the difficulty of circuit design. The device consists of five parts： MEMS digital microphone, data processing module, data storage module,...
