At present, the monitoring methods in most cities are mainly video monitoring represented by cameras and ball machines, and there is a lack of auditory monitoring from the sound dimension. The traditional single video surveillance method is not suitable for many large-scale and complex security surveillance scenarios due to its limited video surveillance scope and incomplete information flow.

The self-developed urban abnormal sound monitoring system can detect sudden abnormal sounds (explosions, screams, alarms, calls for help, etc.) in the environment in real time through the air sonar system and locate the sound source. Combined with the camera system, 360° audio and video synchronization can be achieved. Monitoring, so that both "see" and "hear".