| Anhui Vocational College of Grain Engineering currently has the following four sets of broadcasting systems:classroom broadcasting systems for multimedia teaching and announcements,outdoor broadcast systems for stadium/dorm areas for campus broadcasts and large-scale events,and various English tests.Wireless FM broadcasting system and work bell broadcasting system.The wiring is complicated,the maintenance and maintenance are inconvenient,and it is impossible to manage and control in a unified manner.There are many dead ends,it is not convenient for future expansion,and it is impossible to achieve point-to-point and sub-regional control,and the utilization rate is very low.In response to the above shortcomings,I set up a digital broadcasting system based on LAN,which can integrate the existing 4 sets of broadcasting system channels into the campus LAN,and realize digital three-level authority partition management,which is convenient for expansion and can selectively be used for any partition.At any point,the terminal broadcasts audio and video.The core software of this system uses C language to write software,and calls the system API to make the system interface.The design starting point is simple and sufficient,stable and reliable.In order to ensure high efficiency,relying on the existing campus LAN LAN,the UDP protocol is preferred to transmit audio and video broadcast programs,so that the digital broadcast system main server and the terminal computers in each sub-control area are organically combined to become a"brain center" with clear authority and flexibility.",let the audio and video playback terminals(such as:speakers,projectors),collection terminals(such as:microphones,cameras)become the "five features" of the system,the existing campus LAN is the nerve conduction network,all communication data and The control protocol is conducted over the LAN.This undoubtedly reduces the amount of engineering,shortens the construction period,and saves money.The system has a total of three privilege level control systems,including one main control area,five second sub-control areas and nine three-level sub-control areas.The main control area is located in the college computer center,It is a dedicated main server of the system.Its function is to supervise all areas and terminals in the broadcasting system,and has the highest authority.It can divide the rights of other partitions into partition users.Authorize.There are 5 sub-control areas,which can broadcast audio and video to the broadcast system of the whole hospital,and can also selectively broadcast to any partition or any point terminal.The administrative leaders and the staff on duty can broadcast audio and video broadcasts to the broadcasting system of the whole hospital or any sub-area or any point terminal to facilitate the issuance of emergency notices.If there is a major emergency situation and evacuation is required,the relevant leaders can go nearby.The secondary sub-control area performs an emergency notification,which has the highest priority,and all terminals will be automatically turned on or forced to be played by other purposes.There are 9 three-level subdivisions,which can only broadcast audio and video to the terminal in the local area.After the temporary authorization of the broadcast server in the main control area,the broadcast system of the whole hospital can be temporarily broadcasted.Professional hardware,relying on the author s many years of experience in electrical and electronic teaching and audio HI-FI experience,to ensure the functional effects as the premise,based on the principle of cost saving,combined with the budget of the college,select a group of domestic military industry brand Hushan The power amplifier and various types of speakers and other hardware make the human voice thick and magnetic,the music is high-fidelity,the image has clear resolution and high resolution,and the network is stable and reliable,forming a flexible and easy-to-use digital high-fidelity broadcasting system. |
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