(1) Considerations for system equipment: main equipment of the system, wiring distribution box and zone switcher, floor distribution box, volume adjuster, speaker, connecting wire.
(2) Arrangement of speakers: Arrangement of speakers: centralized arrangement, decentralized arrangement; setting distance of speakers: There are two estimation methods, one is when the 3W speaker is used, the separation distance is (3-3.5) times The height or the electric power density of the speaker is guaranteed to be 0.025-0.05 W/m2. The second method is to set the distance from any part to the nearest speaker to no more than 15 m, and the last speaker box at the end of the corridor is no more than 8 m.
(3) Power selection of speakers: Speakers used in public places such as corridors, halls, restaurants, etc. of the building. If there is no special requirement, the normal rated power should be no less than 3W; and the ambient noise in entertainment places, garages, ventilation rooms, etc. In large places, the power of the speakers should be selected according to the requirement that the sound pressure level of the broadcast is 15 dB higher than the background noise, or the installation distance of each speaker should be appropriately reduced to achieve the desired broadcast effect. The indoor sound pressure level depends on the direct sound radiated by the speaker and the diffused sound generated by the room reflection. The sound pressure level is generally affected by 85 dB in most areas of the sound supply surface.
(4) Emergency broadcast zone switcher design: The emergency broadcast zone switcher is composed of a switch and a corresponding circuit. When the corresponding hungry switch is pressed, the switch immediately sends a control signal to the corresponding floor distribution box, so that the output of the power amplifier does not have to be directly applied to the speaker through the sound regulator, so that the full power is audible to meet the needs of the broadcast. There are several factors that must be considered when designing an emergency broadcast zone switcher: the switch of the switch must correspond to the broadcast zone number; the control information sent by the switcher to the corresponding floor junction box does not have to go through the volume adjuster; in the elevator car The speakers used are connected directly to the power amplifier and do not have to go through the junction box on the floor.
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