Under normal circumstances, public shopping systems in large shopping malls and supermarkets should also have the function of fire emergency broadcasting system. Under normal circumstances, the public broadcasting system not only has the function of playing the background music broadcasting system such as background music and broadcast notification, but also can realize the emergency broadcast of the manual selection in the accident area when encountering the fire alarm. Charcoal BBQ Grill,Charcoal Smoker BBQ Grills,Charcoal Barbecue Grill,Charcoal Grill Shaoxing Haoda Electrical Appliance Co.,Ltd , https://www.zjhaoda.com
In the traditional public address system of large shopping malls and supermarkets, the program source is usually set to three: CD player, dual card recorder and broadcast microphone.
The CD player uses a multi-disc CD player, and multiple CDs are pre-loaded. All the tracks can be played in advance for playing background music.
The recording deck uses a dual-card recording dock. The dual-card can work cyclically, playing background music tapes, and can also be used for broadcast notifications for temporary recording.
The broadcast microphone uses a desktop gooseneck microphone, which is easy to operate, and has a built-in bell generator. It can emit a crisp bell before speaking to remind the audience, mainly for broadcast notification.
The selection of speakers in large-scale shopping malls and supermarket public address systems basically follows the following principles: ceiling-mounted speakers in areas with decorative ceilings, and suspended or wall-mounted speakers in areas without decorative ceilings.
Many large shopping malls and supermarkets are single-storey buildings. According to the requirements of the Chinese fire protection system, multiple fire shutter doors must be installed in the inner area. To this end, when designing large-scale shopping malls and supermarket public broadcasting systems, we must also follow the relevant regulations for broadcasting partitions according to internal fire prevention areas.
Considering that it is necessary to set up a self-contained sound source for merchandise promotion, an emergency broadcast switching module is specially equipped for this purpose. Under normal circumstances, these areas can be broadcast by themselves. In the event of a fire emergency, they are automatically forced to cut into the public address system, giving priority to fire emergency broadcasts .
Considering that the functions and requirements of each area of ​​a large shopping mall and supermarket are different, the public address system should set a volume control with independent volume adjustment for all areas and office buildings. To meet the requirements of fire radio, all should have the emergency switching fader (shear strength) function, to ensure that when the fire emergency radio broadcast maximum volume state can be achieved.
Due to the large background traffic of the mall and the large passenger traffic in the supermarket, in order to prevent the fire alarm from false alarm, it causes unnecessary panic to the customer. Under normal circumstances, if the fire control host and the broadcast host are in the same room, the broadcast zone control system does not set fire. Linkage controls the special function of automatic emergency broadcast . According to the determined broadcast area, the broadcast area selector and the broadcast area switcher are combined to form a broadcast partition control system, and the broadcast area is manually selected to perform background music broadcast or fire emergency broadcast . If the fire control host and the broadcast host are set up separately, only the fire alarm linkage automatic alarm and automatic power-on function are added, and the special function of fire linkage control automatic emergency broadcast is also not set.
[Audio Network Information]