Analysis of the application case of the construction project of Xinghe Experimental Primary School Education Resource Center
Beijing Xinghe Experimental Primary School was founded in 2007 and is a public school supported by Beijing Municipality. It is a high starting point school directly supported by the Chaoyang District Education Commission. With the philosophy of "taking quality as life, promoting development with science, opening education walls, and opening an open international brand school", the school has rapidly developed into a prestigious school with a good reputation. Through the first phase of the digital campus, Xinghe Experimental Primary School has built a digital application based on the campus portal website, Ma Xinlan's education reform experimental network platform, campus cultural applications, CMIS system applications, and mail and instant messaging systems.
Wireless network coverage, new demand for HD recording system
Each classroom of Xinghe Experimental Primary School is equipped with a multimedia teaching system, as well as a modern computer classroom, an oversized classroom for hundreds of students. The campus network uses Cisco3650 as the access layer switch to realize the wireless network coverage of the whole school and provide network applications through 6 dual-CPU servers. With the rapid development of network technology, education informatization has gained popularity. The Beijing Municipal Education Commission has also repeatedly proposed the creation of a digital teaching application platform, the establishment of a convenient and high-quality audio-visual system, and the designation of a pilot school for advanced application of information, gradually improving the hardware facilities of primary and secondary schools in Beijing, and improving the education level of the city. The bidding of the Chaoyang District Modern Education Technology Information Network Center in Beijing is also based on education informatization, and its use unit is Xinghe Experimental Primary School. In order to meet the needs of recording and application of high-definition courses, the school requires a comprehensive application system with network, IT, advanced design, high safety and reliability, and easy upgrade and maintenance.
The application system is to deploy signal acquisition in 12 classrooms of Xinghe Experimental Primary School, use high-definition cameras for signal pickup, and automatically record corresponding classrooms in high-definition according to the application and approval of teacher course recording. As much as possible to avoid interference with the instructor, do not use the sound pickup method of wearing, holding or placing on the desktop for on-site audio pickup, and use technical means to restore the true and clear sound of the scene. Video capture and encoding requires encoding using pure software. System center storage requirements can achieve smooth expansion of capacity and data IO bandwidth without stopping the system, and have high-speed data recovery capabilities and stability that are superior to RAID5. In addition, the system needs to have a unified account authentication system, and the front desk display must have a reasonable structure for convenient operation. VOD on-demand and online live broadcasts can be switched and viewed on the multi-channel screen of the viewing course.
Synchronous technology goes to appointment, AV / IT solution tree is original
By chance, after a friend's introduction, the product manager of Synchronization Technology met the relevant person in charge of the Information Center of Xinghe Experimental Primary School, and talked about the development process of synchronization, the AV / IT concept that has been adhered to, and the synchronization of independent innovation of audio and video products. There are too many similarities with the school running ideas of Xinghe Experimental Primary School and the development direction of education informatization. Simultaneously also understood the specific needs of the school in detail, and promised to customize a set of comprehensive solutions that meet the special needs of the school.
The core business of Synchronous Technology is the R & D and system solution integration of professional AV product IT application equipment. For the purpose of meeting and advocating personalized needs, it has both software and hardware R & D and production capabilities, program design and system integration and implementation capabilities. The synchronized existing product sequence covers multiple fields such as acquisition, editing, broadcasting, storage, management system, hardware products and solutions. Synchronously according to the needs of Xinghe Experimental Primary School and combining with their own understanding, a high-quality quality class recording, transcoding transmission, network comprehensive information release and new storage technology equipment were quickly prepared as a solution.
On November 25, 2009, Synchronous Technology participated in the bidding organized by the Chaoyang District Modern Education Technology Information Network Center in Beijing. On December 25th, we received a notice to win the bid for multimedia teaching project of Chaoyang District Modern Education Technology Information Network Center.
When contacted with the relevant person in charge of Xinghe Experimental Primary School, the other party admitted that compared with other companies, the school valued simultaneous technology and R & D strength. In order to make the high-quality teaching resources of Xinghe Experimental Primary School convenient for internal and external communication, Synchronous Technology has specially designed and developed distributed coding, cluster storage, 3G bandwidth multi-signal format transmission, remote electrical management and control application development of system application software Wait.
Start the journey of the galaxy and debut of diversified products
On February 4, 2010, the Multimedia Teaching Project of Xinghe Experimental Primary School officially started. This is also the first primary school project that Synchronous Technology has taken over. It is also the first product of Synchronous Products after Capital Normal University, Beijing Normal University, Beijing Foreign Studies University School. After the project started, a project leadership group, a project manager group, and an implementation support group were simultaneously established as the overall project control group. Taking the implementation group as the specific responsible group, the site overall planning, cable layout, equipment installation, etc. were started, and two technicians were sent to stay at Xinghe Experimental Primary School to communicate and raise questions in a timely manner.
In order to meet the high-definition picture quality requirements for the recording and application of the Xinghe Experimental Primary School curriculum, Synchronous Technology selected the SONY EVI-HD1 high-definition color camera, which ensures the collection of high-quality video images through the HD CMOS imaging system with up to 2 million effective pixels and ensures the back The effect of the application. Two EVI-HD1s are deployed in each classroom to collect two high-definition images. One is installed in front of and behind the classroom, one of which takes pictures of teachers teaching and the other takes pictures of students listening to lessons. EVI-HD1 high-definition camera adopts fixed camera shooting, with high-resolution, automatic exposure, automatic white balance and other automatic control functions. During the recording process, there is no need for the instructor and system management teacher to push, pull, and shake. On the premise of ensuring the recording effect of the course, the workload of the recording teacher is reduced.
Due to the limitation of objective conditions, synchronous technology does not make any acoustic decoration of the classroom environment. In order to minimize the interference with teachers ’daily teaching habits and achieve the best recording effect, each classroom is equipped with 6 SVS PRO CM-17 unidirectional Interface pickup microphone. These six microphones are installed on the ceiling of the classroom to form a pickup matrix for live audio pickup. They can clearly pick up the voice of the teacher's lecture, the voice of students answering questions, and the live sound from various directions such as media playback devices. The audio obtained by this method of sound pickup cannot achieve the ideal on-site effect. For this reason, we also need to process the audio in the subsequent process of the program to achieve a high-quality live sound reproduction effect with a real sense of presence.
In order to ensure signal quality and reduce signal loss during transmission, all video and audio signals in each classroom are digitally processed through a 3G multi-source signal transmitter DMT-1000S deployed in the classroom and transmitted through 2 3G optical fibers To the central computer room.
The video transmission system is specifically composed of ITSYNCDMT-1000S multi-source signal transmitter and receiver. ITSYNC high-definition video teaching and recording system management software provides account management, operation process control and system working status monitoring, and network and automated program management through a unified management interface without excessive manual intervention. The course recording application platform mainly provides functions such as teacher application, course approval, and authority management. Matrix scheduling can realize functions such as synchronous scheduling, security scheduling, panel lock, signal scheduling, backup scheduling, and automatic upgrade.
In the process of encoding, video encoding can meet the requirements of high-definition image playback and low network bandwidth requirements; use a "pure software" method that completely depends on the computer's central processor to complete the compression processing of video signals and audio signals; Multiple computers and high-speed networks form a clustered signal compression environment. The data compression server first assigns compression tasks to each data compression workstation, automatically detects the state of the encoding blade server, automatically performs load balancing of computing resources, responds to high-speed failures, and automatically distributes Finally, the compressed data generated by multiple compression workstations are combined into the final signal compressed data, which is called "distributed coding".
The VOD on-demand system is based on the Microsoft Active Directory architecture, and manages user identities uniformly through directory services, improving the security and scalability of the system, and achieving the user's design goal of "one-time login, full network access". Combined with Active Directory to control user identity and realize centralized storage and management. The system controls the authority based on the user's identity, assigns the designated authority to the user, and automatically completes the authentication process of "portal system", "e-mail", "database system", "instant messaging system" and third-party systems. In the on-demand module, teachers, students and parents can on-demand the courses they are interested in on the premise of their access permissions on their computers. Establish a connection with the system's on-demand server by downloading and installing the client, and on-demand the courses to be watched if the access permission allows. The live broadcast module publishes the video, audio and other related data of the designated classroom to the network for the clients who meet the access rights to receive. During the live broadcast of the program, the published program data needs to be encrypted.
Rigorous project progress, full service preparation
During the implementation of the project, the project director of the synchronous technology and the school communicate via e-mail and telephone. Every time, when the two parties have new ideas, they will arrange a time for an interview. In the production process of the equipment, several components required for the assembly of Synchronous Technology's "light emitting and receiving system" appeared to be in short supply, and it took a certain time to purchase. The person in charge of the synchronous Xinghe Primary School emphasized that to ensure the quality of the project construction, each component must be strictly implemented in accordance with the requirements documents, and it is better to sacrifice a little time and take strict care of the detailed configuration of the equipment.
In March, the campus safety issues were put on the agenda. Xinghe Experimental Primary School followed the education committee's proposal to strengthen the safety precautions and canceled the night construction time of the project. In order not to affect the students' class and review exams, the project team can only use Saturday and Sunday construction , Wait until the students are stepping up the project process after the summer vacation, so the construction cycle delay will be delayed by 60 days.
As of the initial acceptance, each classroom designated by Xinghe Experimental Primary School is equipped with 2 high-definition cameras to obtain live video signals, 6 condenser microphones for on-site audio signal pickup, and at the same time obtain teachers ’notebooks or DVD / projector and other playback equipment in the classroom. All the way to video and audio signals. The central computer room is equipped with two cabinets, including 12 multi-source signal receivers, 1 HD video and audio scheduling matrix, 8 HD signal acquisition servers, 1 system management server, 16 distributed encoding blade servers, and 3 cluster storage servers , 1 Ethernet switch, 2 ATEN CL5716A KVM switches.
The already complete software modules include WEB services, video and audio collection, distributed coding, video and audio synthesis push, course live broadcasting and so on.
Synchronization Technology provides staged or integrated services for each module of the project implementation service, from environmental preparation, implementation specifications, and system resource division to on-site installation and commissioning, testing and acceptance, and on-site training. Synchronization engineers gradually provide one-on-one training, centralized face-to-face training or online video training for the principals, system administrators, teachers, other users of Chaoyang District, and VOD users.
The multi-media teaching project of Xinghe Experimental Primary School has realized the live broadcast of four channels of high-definition signals. Through the high-quality recording and preservation of the teaching process, the teaching methods and effects of Ma Xinlan are promoted with high-quality video and audio teaching resources to reach a larger range. The purpose of radiating to surrounding schools to achieve the sharing of high-quality educational resources.
Project summary
The construction project solution of the Educational Resource Center of Xinghe Experimental Primary School breaks through the traditional course recording method and meets the needs. The teachers using this system will not perform additional operations during the course and the normal lecture process, and the recording site will not There is interference from other staff. After the teacher's application for recording the course is approved, the result of the approval will be automatically recorded in the system's database, and the system will automatically start and stop the course recording process according to the arrangement of the course. Teaching teachers can objectively see the teaching process of themselves and other teachers, learn from each other's strengths and improve their teaching level. The system adopts an IT-based program, and a software upgrade module is designed to upgrade each module of the system remotely. With its massive storage scale, multiple security mechanisms, high availability for fast fault recovery, fully online data services and a good online expansion architecture, cluster storage can completely replace traditional near-line products with lower costs.
"Time will not wait for me, willing to be a way-opener", Synchronous Technology has verified its products and team strength in the opportunities given by Xinghe Experimental Primary School, and continues to innovate in the improvement; Xinghe Experimental Primary School is also in the solution provided by Synchronous Technology Exploring the charm of digitalization, and getting better and better on the road of education informatization.
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