Overview：

Public broadcasting is a broadcasting that serves the public in a certain area. It is used to release various news and internal information transmission, release work and rest signals, provide background music, and be used for calling and forcibly inserting emergency broadcasts for catastrophic accidents, etc. It is also an urban and rural area. It is an indispensable part of various public places in modern cities.

  Application：

The public broadcasting system has the functions of background music broadcasting, public broadcasting and fire accident broadcasting.

The fire accident broadcast function is a broadcast facility used by the fire alarm and linkage system to command and evacuate the crowd under emergency conditions, and it plays a pivotal role in the design of building weak electricity. This function requires that the public address system can reach the required sound intensity, so as to ensure that in the event of an emergency, it can be used to provide enough sound for the people in the areas that may be involved in the building to clearly hear the alarm and guidance.

  Background music：

The main function of background music is to cover up the noise and create a relaxed and harmonious listening atmosphere. Because the speakers are evenly arranged, there is no obvious sound source directionality, and the volume is suitable, it does not affect the normal conversation of the crowd. It is one of the important means to optimize the environment. It is widely used in modern intelligent multi-functional buildings. Background music (BGM) usually distributes the BGM programs recorded on tapes and records through BGM playback equipment (tape recorders, CD players, etc.) to distribute the output to the speakers of each broadcast area to achieve music playback. The background music is monophonic music, and the location of the sound source is hidden, making it difficult for people to feel the location of the sound source. This function requires the sound field strength of the sound reinforcement system to be based on the principle of not affecting the speech of similar people.

The public address system can play the role of publicity, broadcast announcements, find people, broadcast evacuation in emergency situations, etc.