Debris flow infrasound signal front-end duty circuit

The invention provides a debris flow infrasound signal front-end duty circuit. The circuit comprises a noise reduction and frequency selection module used for obtaining sound signals, performing noise reduction and frequency selection processing on the sound signals, and obtaining infrasound signals; a comparison module used for comparing the infrasound signals and a preset threshold; and a microprocessor used for acquiring output signals of the comparison module and generating control signals according to the output signals, wherein the control signals are used for controlling the work state of debris flow infrasound monitoring equipment. According to the circuit, noise of the debris flow infrasound signals can be reduced, the processing timeliness of the debris flow infrasound signals is improved, the processed data volume of a monitoring center is reduced, and the power consumption of the system is effectively reduced.