When designing the broadcast sound system requirements, carefully consider and select the following aspects of the device:
(1) Considerations for supporting system equipment: main equipment of the system, wiring distribution box and zoning switch, floor distribution box, volume conditioner, speaker, and connecting wire.
(2) Loudspeaker layout: Loudspeaker layout: centralized layout, decentralized layout; loudspeaker installation interval: There are two budget methods, one is when using 3W speakers, the distance interval is (3-3.5) times the floor The height or the electrical power density of the speakers is 0.025-0.05W / m2. The second method is to arrange according to the specification that the walking distance from any part to the nearest speaker does not exceed 15m, and the last speaker box at the end of the corridor is not more than 8m.
(3) Power selection of speakers: speakers used in public places such as corridors, halls, restaurants, etc. of the building, if there is no special request, the normal rated power should not be less than 3W; while in cultural venues, garages, ventilator rooms and other environmental noise In large places, the power of the speakers should be selected according to the request that the sound pressure level of the broadcast is 15dB higher than the background noise, or the device spacing 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 diffuse sound generated by the room reflection. In most parts of the sound supply surface, the affected sound pressure level is generally 85dB.
(4) Design of emergency broadcast partition switch: emergency broadcast partition switch is composed of switch and corresponding circuit. When the corresponding hungry switch is pressed, the switcher immediately sends a control signal to the corresponding floor distribution box, so that the output of the power amplifier is directly added to the speaker without passing through the sound conditioner, so that it can sound at full power to meet the needs of broadcasting. There are several factors that must be considered when designing the emergency broadcast partition switch: the switch of the switch must correspond to the broadcast partition number; the control information sent by the switch to the corresponding floor distribution box does not need to pass through the volume conditioner; in the elevator car The speakers used are directly connected to the power amplifier without going through the distribution box on the floor.
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