Overview and needs
The university campus is large in size, generally thousands of acres, and consists of multiple campuses and branches. There are different functional zones on campus. The functional requirements for campus radio are basically used for self-run programs on campus radio stations, publicity of campus culture, and listening tests for English CET-4 and C6. Generally, there are no requirements for music bells and radio exercises. Large, so different districts are required to broadcast different campus radio programs at the same time. Each campus and branch can operate independently, and the broadcast master control center can also be centrally managed.
Modern university campuses, computers and networks have spread over every work and study place on the campus, so the construction of the broadcasting system can use the IP network broadcasting system, which is based on the existing LAN / WAN network, without separate wiring during installation. Based on IP network program transmission, each broadcast point can have its own independent broadcast program, and can perform two-way call broadcasting to any broadcast point or all broadcast points. Its IP network broadcast terminal can order programs from the broadcast audio server. The diversified broadcasting methods completely solve the problems of short transmission distance, poor sound quality, complicated maintenance and management, and lack of interactivity in the traditional broadcasting system. It provides the feasibility for universities to build a broadcasting system that meets the needs of modern education and teaching.
Design
IP network broadcasting is a trend in the development of campus broadcasting systems. The construction of the university IP network broadcasting system follows the principle of "advanced and applicable, economical and practical, safe and reliable, mature and stable, powerful, and cost-effective". It also considers important factors such as construction and maintenance, while also leaving room for the school's future development, expansion, and transformation. The design of the overall campus broadcasting is systematic, complete and comprehensive. The system can fully meet the requirements of convenient operation, simple maintenance and easy management. The design plan is scientific, rational and practical.
The IP network broadcasting system adopts a fully digital audio processing scheme. The transmission system is based on Ethernet and cooperates with the TCP / IP protocol to transmit audio signals in the form of standard IP packets on LAN / WAN and Internet to achieve lossless data transmission. In this way, problems such as distortion and noise that occur during transmission are completely resolved. Ensure that the system has good stability and scalability. Today, with the rapid development of the network, the campus campus broadcast design adopts the IP network broadcast system for transmission. It can very flexibly connect the broadcast sub-control and IP network broadcast terminal to the computer network, which has a very broad expansion. Can truly realize point-to-point broadcasting, unlimited partition grouping, management of remote, user-friendly, intelligent and economical broadcasting system.
The design of the university IP network broadcasting system is mainly composed of four parts: the sound source part, the control part, the transmission part, and the reception part.
Sound source part:
Audio sources are generally divided into analog audio sources and digital audio sources. Such as: computer (system audio server), high-quality DVD player, touch-type dual deck, digital tuner, broadcast microphone, etc.
Control section:
The university IP network broadcast system is based on the TCP / IP architecture, so audio collection, playback management, and remote calls can all be distributed through the network without geographical restrictions. The network audio server has a built-in auto-playing engine, which can automatically fix, group or uniformly broadcast the broadcast programs according to the preset playlist.
Transmission part:
At present, the transmission requirement of the university IP network broadcast system is 128Kbps. The construction of the general university campus network has reached the requirement of 10M / 100M network, which can fully meet the transmission rate requirements of the university IP digital network broadcast, and can ensure the reliability and stability of the broadcast signal and voice The signal is clear.
Receiving part:
According to the general situation of the university campus, there are three ways to design the IP network broadcast reception, one is to directly use the IP network speaker reception to listen; the second is to use the digital IP network broadcast terminal to receive and demodulate the audio signal, and transmit the given resistance speaker Listening; in addition, considering the economy, it can also be received and demodulated through the IP network (on-demand) terminal, and then sent to the power amplifier to be converted into a constant pressure broadcast signal, and various constant pressure speakers are used to listen to the broadcast.
System functions
full functioning
The system covers the functions of traditional public broadcasting systems, such as unified broadcasting, zone broadcasting, background broadcasting, emergency broadcasting, scheduled broadcasting, unattended, telephone broadcasting and other functions.
Audio on demand
The system has a real-time on-demand function, which allows administrators to communicate with the system server in real time at the sub-control station to achieve interaction. Free on-demand server program content.
Paging intercom
The system can realize any paging, two-way intercom function. That is, the IP network paging intercom terminal of the main control center can perform two-way voice intercom with the terminals of each campus or branch campus.
Leader remote speech
The system supports the leader online speech function. Leaders do not need to go to a special broadcast center, just install the IP network broadcast paging intercom terminal GM8003D, you can easily achieve remote speech. You can speak to the whole area or to the optional area.
Remote management
Where you can access the Internet, you can monitor and operate the entire system by installing IP network sub-control software.
Permission settings
The system can set up various roles, set up the main administrator, supervisor leader, query administrator, control administrator, administrators with different permissions can perform different authorization operations. Unauthorized operation is invalid.
Energy saving and environmental protection
The IP network broadcast terminals of the system can automatically cut off the power supply of the external amplifier when there is no signal input to avoid the amplifier working for a long time, which can extend the service life of the equipment and achieve the purpose of energy saving.
System topology
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