The generalized broadcasting system consists of two major categories: sound reinforcement system and sound release system:
1. Sound reinforcement system: The speaker and the microphone are in the same sound field, and there are whistling, distortion and oscillation caused by acoustic feedback and room resonance. To ensure system stability and normal operation, the highest available system gain is 6 dB lower than the critical gain of the acoustic feedback self-excitation.
2, sound system: the system only the tape machine, CD player and other sound sources, no microphone, there is no acoustic feedback, the acoustic feedback coefficient is 0, is a special case of the broadcast system.
The public broadcasting system of modern buildings can be divided into the following three types according to the scale of the building, the nature of use and the functional requirements:
(1) Business Broadcasting System
(2) Service Broadcasting System
(3) Fire accident broadcasting system
1. Business broadcast system
Business broadcasts are set up in buildings such as office buildings, commercial office buildings, schools, hospitals, railway passenger stations, airports, stations, banks, and factories to meet business and administrative requirements.
2. Service Broadcasting System
Hotel, hotel, shopping mall entertainment facilities and large public events venues set up service broadcasts, service broadcasts are background music and room program broadcasts, the purpose is to provide people with appreciative music broadcast programs, with services as the main purpose. Hotels and other services Sex broadcast programs generally choose 4 sets. The content of the broadcast program should be arranged according to the client and the engineering level.
3. Fire accident broadcasting system
Mainly used for fires, firefighters in the fire control room broadcast people through fire accidents to quickly evacuate dangerous places.
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