(The public broadcasting and background music system is divided into three parts: one part is the background music system, which is used to broadcast background music to the public flow areas such as the core square of the community, gardens of various groups, and main roads; the other part is the public broadcasting, which is usually used for broadcasting Information such as announcements and notifications are sent out, and emergency broadcasts are carried out in emergencies such as fires. Public broadcasts are controlled by the core to select program sources, and can be broadcast and switched in different areas. The volume of the public address can be controlled by each zone itself. The last part is the assembly broadcasting system in the core square of the residential area. Considering the particularity of the core square, the system has several microphone interfaces in the core square. The area of ??the core square is usually the same as other areas. It can be used to speak on the spot and give full play to the functions of the system.)
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