Schematic diagram of intelligent broadcasting system

　　

　　Intelligent broadcasting system classified by purpose

　　

　　1. Outdoor broadcasting system

　　

The outdoor broadcasting system is mainly used in sports venues, stations, campuses, art squares, music fountains, etc. Its characteristics are a large service area and spacious space. High background noise; Sound propagation is mainly through direct sound; The required sound pressure level is high. If there are high-rise buildings or other reflective objects around, and the layout of the speakers is not reasonable, the sound waves will be reflected multiple times to form a delay of more than 50ms, which will cause double or multiple sounds, and in severe cases, echo and other problems, affecting the clarity of the sound and the localization of the sound image. The sound effect of outdoor systems is also affected by climate conditions, wind direction, and environmental interference.

　　

　2. Indoor broadcasting system

　　

Indoor broadcasting system is the most widely used system, including various cinemas, sports venues, dance halls, etc. It has strong professionalism and can be used for both non-verbal sound amplification and various cultural performances. It has high requirements for sound quality, and system design should not only consider electro acoustic technology issues, but also involve architectural acoustics issues. The shape of the room and other factors have a significant impact on sound quality.

　　

　3. Public Broadcasting System

　　

The intelligent broadcasting system provides background music and radio programs for hotels, commercial buildings, ports, airports, subways, and schools. In recent years, the public broadcasting system has also served as an emergency broadcast, which can be linked with the fire alarm system. The public broadcasting system has multiple control functions. Such as selection broadcasting and full call broadcasting functions, mandatory power exchange functions, and priority broadcasting rights functions. Loudspeaker loads are scattered and have long transmission lines. To reduce transmission line losses, 70V or 100V constant voltage high impedance transmission is generally used. The sound pressure requirement is not high, and the sound quality is mainly mid to high tones. [1]

　　

　　4. Conference system

　　

With the increase of domestic and communication, video conferencing and digital conferencing systems (DCN) are developing rapidly. The conference system is widely used in conference centers, hotels, groups, and government agencies. The conference system includes a conference discussion system, a voting system, a simultaneous interpretation system, and a video conference system. Require synchronization of audio and video (image) systems, all controlled and stored by computers for meeting materials.

　　

Regardless of the type of broadcasting sound system, it can be basically divided into four parts: program source equipment, signal amplification and processing equipment, transmission lines, and speaker system