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New Trend of Public Broadcasting System -- Networking, Wireless and High-definition


Public Address (PA) is a system that is managed by the user units themselves, carries out business and emergency broadcasting for the public within the scope of the building, and provides background music. At present, public broadcasting has shown a good momentum of development. The main manifestations are: more and more market demand, more and more complex functional requirements; the innovation ability of radio production enterprises continues to improve, and the products are becoming more and more humanized.

Today, with the rapid development of technology, public broadcasting and professional sound reinforcement systems, which belong to the same category of electroacoustic, have made great progress, but their development process has different characteristics: professional sound reinforcement systems are generally classified according to electroacoustic performance indicators, while public broadcasting is mainly classified according to the functions and language intelligibility. In recent years, the public broadcasting system has shown a new trend of network, wireless and high-definition.
1. Network development trend of public broadcasting

Recently, many signs show that public broadcasting has entered the era of network.

A typical networked broadcasting system is an audio sound reinforcement system based on IP data network transmission, which can be used in the same network segment LAN, cross-gateway LAN or Internet network. The networked broadcasting system based on DSPPA protocol integrated into TCP/IP is an application, which is more flexible than the CobraNet dedicated broadcasting system. CobraNet network broadcasting system is a network audio real-time transmission technology that integrates hardware, software and communication protocol. It can ensure the quality of audio transmission, but it is limited by expensive equipment and cumbersome dedicated lines, and its flexibility is not enough. Typical network broadcasting system is composed of network broadcasting control center, network terminal, network paging microphone, network fire interface and so on. The system breaks through the shortcomings of traditional public broadcasting that can only be downloaded and can only be centrally controlled by the computer room. It has strong interactive functions, partitions and groups can be arbitrarily controlled and combined, and ultra-long-distance transmission can be realized through the network. If the typical network broadcasting system is combined with the terminal system such as safe city and bank intercom, the special function extension application can be realized.

The network broadcasting system is generally applicable to large commercial buildings, schools (university towns), buildings, airports, stations, urban areas and other large regional occasions. The Shanghai World Expo is to use the networked broadcasting system to set up multi-level priority according to plots, districts, and national venues, thereby saving costs and easily managing.

Design network broadcasting need to pay attention to a few points:
(1) The needs of users should be effectively understood to avoid the use of networked public broadcasting for digitalization and wasteful investment;
(2) Understand the design parameters of the network system to be built in the project, judge whether the CobraNet network with high sound quality guarantee or the convenient and low-cost TCP/IP network, and determine the multicast protocol to be opened;
(3) According to the project situation, the priority level is set according to the demand, and the network is flexible.

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