Public broadcasting is a mass media that only rely on sound to propagate. As early as when television appeared, it was predicted that "TV will eventually make people obsolete by broadcasting." But today, it is accompanied by time, space, and participation. The traditional broadcasting of the three major characteristics still plays an irreplaceable role in our society. With the rapid development of the Internet, the development of information technology and the rise of the Internet has become an unavoidable topic in the new world. Any model of communication that wants to simply occupy the front line in the traditional world will lose more room for development. When the traditional media gradually felt the omnipresence of tremendous pressure and shouted "wolf", the combination of network and broadcasting is even more people saw the dawn of radio development. We firmly believe that the development of broadcasting still has a future. More campus IP network broadcast systems compare the advantages of smart public broadcasting in space and limitations. Please log in to Sibon. . net QQ2260194215 TEL: 136--8494--0906 engineers: Huang workers <br> <br> a public broadcast media and other comparative advantages defect <br> <br> broadcast as a mass media, it is different newspapers The place with TV lies in that it uses radio waves as a carrier to rely on sound alone to transmit information. It does not rely on text as much as newspapers do, but it also supplements images; it does not have both sound and images like TV; broadcasting depends on sound transmission for audiences. Listen. This feature gives it the advantage that other media cannot replace: Bending Products,Thick Steel Plate,Circular Steel Plate,Corrugated Metal Sheets Suzhou Gold ant Precision Sheet Metal Co.,Ltd , https://www.jmywelding.com
(a) Concomitant Because the broadcast only depends on sound transmission, it can be listened out of focus, and it can be moved at any time, so he can be a faithful companion of the listener. The audience can listen to the radio while doing other things, and where they can go, where they want to go, and where they can hear it, unlike reading the newspapers and watching TV, they can't use it as one thing. They have to be fixed, read, and read with conviction. In recent years, traffic programs have been set up throughout the country to serve drivers who listen to the radio while driving. These radio stations and programs generally receive good social and economic benefits. They are showing the unique advantages of broadcast accompaniedness.
(b) Space-time broadcasting uses radio waves as a carrier, and radio waves cover 300,000 kilometers per second. It traverses the earth seven and a half times. The speed of propagation is much faster than that of newspapers. Broadcasts are fast and can be broadcast at any time, rolling broadcasts, and live broadcasts are almost in sync with the facts. This rapid spread of broadcasting has great advantages for the ever-changing city, finance, trade, and information market.
The IP broadcasting system is used in the campus broadcasting program to analyze the use requirements of the broadcasting system according to the secondary school. Combined with the distribution of the school building, the broadcasting system adopts the IP network broadcasting system based on the campus network model for transmission and control. The network broadcasting system solves the problem of large secondary schools. Wide area, wide broadcast transmission problems, through the campus network transmission, a good solution to the above problems, but also to ensure the campus broadcast audio quality. The stable and reliable network broadcast directly depends on the good performance of the combination of hardware and software of the network server and network adapter.
The IP network broadcast system is composed of an IP network broadcast control center, an IP network adapter, and an audio workstation. The system server uses high-speed dual-CPU processing (32-bit MCU + 16-bit DSP), digital amplifier, a short delay (0.1s) sound quality (20-16KHZ), supports a variety of audio format data network transmission (MP3, MP2, AAC, WAV), perfect network adaptability, and supports real-time encoding of audio input from the audio set. The system has: Automatic IP address acquisition (DHCP), direct cross-gateway and core routing switch functions, support for Internet broadcasting, and adaptive network traffic At the same time, the system upgrade can achieve fire linkage, network power (POE) function. Its highly efficient and stable operation system satisfies the requirements of modern campuses for building informatized, networked, and digital campus broadcasting systems. Only by covering the campus network, accessing the IP network adapter can manage the broadcast area:
The digital IP network broadcasting system adopts the TCP/IP network technology widely used in the world today to transmit audio signals in the form of IP packet protocols on LANs and WANs, completely solving the problems of poor sound quality, complicated maintenance, and interaction of traditional broadcasting systems. Poor performance and other issues. The system equipment is easy to use and easy to install and expand. The digital broadcasting terminal can be connected to a computer network to form a powerful digital broadcasting system. 
Functionality: Each terminal can be controlled independently to play different sounds. Not only can we fully implement the basic functions of traditional broadcasting systems, such as the basic requirements of timing and ringing, zone play, etc., but also have audio free on-demand, teachers arrange program broadcasting and other functions;
On the transmission side: The audio transmission distance is infinitely extended, and it is easy to implement campus broadcasting and lead off-campus remote broadcasting. Even if you are abroad, the sound can be clear and fluid, like listening to the scene. Non-traditional analog broadcasting systems have the absolute advantage;
Sound quality: To achieve stereo and CD level, suitable for daily foreign language listening training in the classroom, each pronunciation can be clearly identifiable. Especially in the middle school entrance examination, college entrance examination, and class 46 listening broadcast, students can effectively improve their listening performance, no longer plagued by ambiguous voices. 
Second, the difference between traditional analog broadcast and digital IP network broadcast system:
Comparison of advantages of IP digital broadcasting and traditional broadcasting 1. Background music playing. The digital IP network broadcasting system uses the network to transmit digital audio signals, and the audio signal quality reaches the CD level. Traditional broadcast transmission of audio signals over long distances makes it difficult to guarantee audio signals, often introducing noise and current sound. The sound quality is not at a uniform level, and digital broadcasting is obviously superior to traditional analog broadcasting.
2. Temporarily insert background music. The use of digital IP network broadcasting system can be easily solved, and the operation is simple and the program is arbitrarily selected for playing. No need to go to the radio room operation. It is very difficult to implement this function using a conventional broadcast system. Even if it can be realized, the operation is also very tedious. Must go to the radio room operation. Digital broadcasting can directly connect the audio source or microphone to the floor terminal to achieve the broadcast. Analog broadcast can only be operated in the computer room.
3, business language broadcasts. By paging the microphone over an IP network, important broadcast messages can be delivered without distance restrictions, delays, and high fidelity. Generally, the operation can only be completed in the engine room. Even if it is a remote pager, the distance is strictly limited, and it is difficult to ensure that there is no delay problem. At the same time, noise and interference problems cannot be solved. IP network paging microphones can be used for remote pager broadcasting and intercom in places where access to the network is available. This is not possible with analog broadcasting.
4, emergency broadcast. The more efficient and stable digital fire-fighting linkage system is the unique quality of digital broadcasting. The fire-fighting information comes from a temporary system to broadcast fire-fighting voices in a customized way at the earliest time to protect personal and property safety of office buildings. The alarm voice format has limitations and the stability needs to be improved. It may not be able to quickly, accurately, and clearly communicate alarm voice information. The alarm mode is relatively simple and not humanized. Digital broadcasting has a relatively independent emergency broadcast processing system. It can configure alarm linkage modes without restrictions according to actual needs and accurately communicate fire information at the first time.
5, regular broadcast. You can enter the play schedule programmatically by week or date and the system will automatically run. The program is set up once, and no manual switching is required during the season. Large screen Chinese color display window, at a glance. All working status of the system is displayed intuitively. The process of programming or writing programs by the host computer is not humanized enough to achieve regular broadcast once and for all. Digital broadcasting operations are more humane, more convenient and more adaptable to the trend of the times.
6, broadcast management. The software server login adopts password login management, and distinguishes administrator and operator login passwords. The administrator has the highest system setting authority to ensure that the server system security broadcast system is managed hierarchically in the simulation system. The digital broadcasting system login can set different levels of management authority to ensure the security of the broadcasting system.
7, sub-control system. Support multiple remote software operating systems. Through software settings, each floor or floor can only be responsible for each network audio terminal in the area. It can not control other areas, and it is very convenient to modify and reset. Only broadcast in the master control room. The broadcast system partition management function is not in place. Analog broadcasts are difficult to achieve a true partition control system.
8, the system standby. When the system does not perform any broadcast, the terminal server is turned off, and the speaker can not hear any noise. This not only ensures the cleanliness of your work environment, but also greatly improves the service life of the equipment and speakers. When a broadcast signal enters the terminal server, it automatically releases sleep and broadcasts. Traditional broadcasts are in standby mode and noise can't be avoided. Digital broadcasting is an upgraded version of analog broadcasting. The digital broadcasting system is more in line with the real world of energy conservation and environmental protection.
9, easy to operate. IP network broadcast system combined with mouse and keyboard operation, not only display intuitive, more user-friendly operation, large touch screen, real-time display of the current system work status, good man-machine conversation function, beginners can easily master without professional training, easy to learn Easy to understand. The tedious key operation of analog broadcasting, its characteristic decides that the user needs professional training to use the function of the broadcasting system correctly. The digital broadcasting system software platform is a computer operating system, which is in line with people's operating habits, and has a high degree of user adaptability. This is something analog broadcasting can't match.
10, system maintenance. IP network broadcast is shared with the network physically, so it does not add extra maintenance work beyond network maintenance; in application, the system can set separate network segments from computers, and each network broadcast adapter embedded system program is solidified and will not be affected. Virus infection, the overall system is highly stable and reliable and zero maintenance. Not compatible with the network. System stability is inferior to digital broadcasting. The tedious cabling method determines the inconvenience of system maintenance and troubleshooting. The digital system can be built on the existing network system, but it does not affect the original system functions and does not require rewiring. Pure digital transmission greatly reduces construction work and maintenance work.
Third, the system configuration 3.2.1 Campus Broadcast Control Center configuration for this school's broadcast system design uses a network-based digital broadcasting system, the use of network platform, the school broadcast center and the front-end of the various partitions, all communication signals The control protocol is transmitted over the network. The network-based digital IP network broadcasting system is adopted. It is a purely digital audio broadcasting system. Digital audio signals are transmitted via the school's internal network, reducing the construction difficulty and construction costs in the earlier period, and achieving audio CD quality at the same time. Level, broadcast system specific configuration is as follows:
Main Control Room: The campus broadcast control room is installed in the network center and is configured with the main server (T-6700, T-6700R), audio source equipment, IP paging microphone, remote control equipment, fire-fighting linkage equipment, speakers and other peripheral equipment; The main control room is responsible for the operation and configuration of the entire system. It centralizes the control of the entire campus broadcast, and can realize regular play, broadcast, paging, fire fighting, and remote control functions.
3.2.2 Outdoor Playground Station/Headmaster Room Radio Station Configuration Substation The radio station is equipped with a remote sub-control computer, sub-control software, IP paging microphone, and audio source equipment to control the independent play function of each broadcast area to achieve decentralized Management (via priority level setting, permission setting, and sub-control can also manage each other), can use notification functions, background music playback, paging and other features.
3.2.3 Campus Broadcast Configuration Each zone setting: Broadcast area, each zone is configured with IP network terminal adapter (with power), or IP network terminal adapter and power amplifier distribution use, according to different regions to choose different speakers to expand A total of 14 broadcasting areas: the school's experimental building, primary and secondary school teaching buildings, administrative buildings, gymnasiums, outdoor playgrounds, outdoor areas, etc. The indoor public areas are equipped with IP network adapters (with power), and equipped with indoor acoustic columns; System diagram:
Outdoor public areas are equipped with IP network adapters and power amplifiers, and outdoor sound columns are located at the front of each area;
Outdoor partition configuration, system diagram:
3.2.5 Zoning Design The broadcasting system design covers the school's experimental building, teaching building, dormitory building, art building, wind and rain playground, outdoor playground, outdoor area, etc.; the broadcasting system is partitioned by floors, combining different functional areas to public broadcasting. Differences in the use of the system, the division of public broadcasting partitions (see "Public radio horn point table"); 
The speaker configuration is one of the main bodies of the broadcasting system. The speaker occupies a large part in the broadcasting system, and the selection of the speaker is very important. Loudspeaker selection and location should in principle choose different specifications of broadcast speakers depending on the environment. In the design of campus broadcasting, we must conduct a site visit to the campus site and use campus environment to design. The main points of the campus radio design speaker are as follows:
Loudspeaker selection: Indoor walkways use wall-mounted speakers, outdoors use outdoor waterproof sound column, classroom use wall-mounted broadcast speakers:
Power selection:
Indoor wall-mounted speakers are installed in classrooms of teaching buildings, and speaker power is selected to be 10W;
Install wall-mounted horns in the corridor of the teaching building area, with power matching 10W;
Install a waterproof sound column in the outdoor area with a power of 45W/90W. (In which the stadium uses 90W high power waterproof column)
Speaker Partition: The speaker point relates to the partition of the broadcast system, and the partition is for ease of management. In principle, all areas that need to be treated differently should be divided into different areas to meet the management requirements of daily broadcasting.
There are also many different modes of partitioning:
Power partitioning - multiple branches of the same amplifier's output signal. Power zoning is generally applied to areas with multiple partitions, small partition power, and less demanding partition management functions.
Signal partitioning - Each partition is a corresponding different signal source. With the signal partition format, the size of the partition power of the broadcast speaker is not limited, the partition is more flexible, and the extension performance is also good. General applications and applications with higher partition management capabilities.
Some special occasions will also use the above two partition methods together.
Different from the physical partition of the traditional analog broadcasting system, the modern digital broadcasting system adopts logical partitioning, and the partition is more flexible and can be flexibly changed.
3.2.6 Transmission Line Campus Broadcasting System The transmission line consists of two parts. The first part is from the power amplifier to the front speakers. The line uses a 2-core RVV sheathed cable. According to the calculation of the transmission distance between the amplifier and the horn, the trunk should use RVV2 x 2.5 protection. With speaker cables, branches should be RVV2 x 1.5 sheathed horn lines, and the lines should be covered with steel pipe/PVC pipe. The second part is from the center of the network to broadcasting terminals in each area, and the communication network based on the campus is used to communicate with the internal network. The transmission line adopts (six class) network communication cables;