It is deemed to create video conferencing

Videoconference in Shenzhen regarded record of professional introduce you to: Technology Co., Ltd in Shenzhen regarded video dedicated to product development, teaching, touch devices, production, sales, service, specializing in the production of teaching one machine, LCD whiteboard, one PC Touch TV-One PC, touch one, touch LCD advertising machine. Company fully implement ISO9001 and ISO14000 quality system certification through the National CCC and CE certification standards. Body Profile video conferencing multimedia video conference, also known as video conferencing, video conferencing, etc., which can be achieved between the two and multi-point real-time transmission moving image, voice and application data (whiteboard, graphics) and other forms of information in the global video conferencing software of choice Brand -DX4000. Development based video conferencing circuit-switched network in the 1970s, many countries were tested videoconferencing, but basically Modelling was used to transfer images not only makes high operating costs, but also to a lot of people during a meeting can not using the session to talk; during the 1980s, video conferencing business largely been replaced by digital transmission. Due to multi-point communications under videoconferencing many cases, it is critical to solve interoperability problems. ITU-T (formerly CCITT) in 1984 to develop the H.120 and H.130 and other recommendations, unified data compression coding algorithm was followed in November 1990 adopted a new H.261 and H.200 series of recommendations, H.120 and H.130, etc. to solve the TV standard, PCM standards and other issues unresolved. These and other recommendations and T.120 for transmitting still images eventually formed the H.320 family of standards is an important component. H.320 family of standards to support ISDN, E1 and T1, the bandwidth from 64 ~ 2Mbit / s. The proposal regulates the main technical aspects of the Internet ISDN video conferencing system, this is the first formulation based on a particular network protocol interoperability for video conferencing services and products between different companies provide a basic guarantee, the introduction of this standard , a landmark development in the history of video conferencing, laid the foundation for the development and popularization of video conferencing. H.320 main components of the device multiple point control unit (MCU) and terminal equipment. This is a very comprehensive system at the time, but because the system is based on circuit-switched network basis, subject to many restrictions, but also led to a lot of problems. Circuit switching feature is connection-oriented, stable transmission rate and delay, low delay, low error rate, so the quality of video conferencing easily assured. But its drawback is connected and fixed, resulting in higher subscriber line use charge. User-level access commonly used El ISDN2B + D line mode or connected access, leased line can guarantee the good stability and image quality, but the network utilization rate. ISDN influenced by line, to the line synchronization higher. Both transmission limit the size and scalability of the meeting, the actual size of the network when the network is difficult to carry out further expansion. IP-based video conferencing networks with packet switching technology advances, ATM at one stage been a great advance. Since 1995, ITU-T has launched a series of standards H.310 and H.321 for ATM networks. But over time, the possibility of getting smaller and smaller ATM to the desktop, and thus the possibility of application of H.310 or H.321 is also very small. In 1996, ITU-T H.322 and H.323 has launched a series of standards for computer local area network. H.323 standard after four years of development, its 2000 launch of the fourth edition has been supported by most video conferencing manufacturers. H.323 is not a single standard, but a complete family of standards with respect to real-time multimedia applications in IP environment, which calls for the establishment, management, and all aspects of the transmission media formats has improved and stringent requirements. You can take full advantage of IP-based H.323 standard network resources, and its constituent elements, including video terminals, multipoint control units, gatekeeper and gateway, video can be diverted to the office desktop, using the data in real-time interactivity, complete coordination office, allowing users must free themselves from the meeting room to fix the limits, to achieve a real sense of video communication, and support of the manufacturers of equipment, interoperability is good. H.323 related to terminal equipment, video, audio and data transmission, communication control, the content of network interfaces, including the composition of multipoint multipoint control unit (MCU) (Multipoint Controller (MC) and more Point Processor (MP) composition), gateways and gatekeepers and other equipment. H.323 system is basically a balance between traditional PSTN and IP network call flow characteristics and the development of open standards system, represents the major trend of multimedia telecommunications services. It's success is drawing the network, the Internet, and operational experience of many telecommunications networks, with the PSTN network, and narrowband video services and other data services and application of network interoperability. H.323 in use on the network can be developed many of the underlying transport network independent of multimedia applications, such as multimedia video conferencing, multimedia monitor, multimedia production scheduling control, remote corporate training and education, multimedia call center, online IP telephony, IP fax online online video on demand and broadcasting, and can use a variety of applications and services H.323 will be superimposed on the same transmission network platform. H.323 uses an advanced TCP / IP technology, providing the same performance and more features, while greatly reducing the cost and the cost of user terminals using the subscriber line, with high performance and low cost. Video conferencing systems feature list -DX4000 before ● multiparty audio and video interactive use of advanced H.264 video compression algorithm, the perfect high-definition picture quality, multi-party audio and video interactive, multi-screen output screen display, PTZ control function. Whiteboard can be freely drawn on the whiteboard area, writing information; support people simultaneously; a convenient and flexible laser pointer, etc have to use a highlighter and enhancement tools; support for screen shots arbitrary rectangular area, and the grasp of the static image It is displayed on a new whiteboard page. Dynamic PPT PPT perfect support dynamic display, reducing high-definition, high-fidelity dynamic images and audio and video effects. File sharing supports common document sharing and share-based file browser; you can put on a normal document page shared whiteboard for all participants to watch, support people while tagging, sketch and other operations; also can support multiple IE audio and video file formats and file sharing; support share multiple documents simultaneously. Co-browsing allows all participants under the control of an operator, synchronous browsing the web; supports sketch on the page, to facilitate the participants to discuss and exchange; support to open multiple pages. Media Player multimedia file can be a local source as a virtual device, the audio and video content to other users in the conference. Desktop sharing conference controller can be a desktop operating conditions and application procedures for all participants to share, easy to work and application training; right through the switching operation, the user can store their desktop operating right by the other remote users remote control. Participants can either text communication open text communication for everyone, but also may initiate communication with the specified point privacy among participants. File transfer conference, a file can be easily transmitted in real time to all participants or designee; "File Transfer Manager" screen, the local user can upload and download files management; Chairman of the user can be promptly removed Conference The transfer files. Record a meeting at any time of the process of meeting record, stored in the local computer; the operator may be meeting recording for editing, upload to the system, posting links to your own website for your visitors demand viewing. Chair Control chairman users can create conference process; after the adoption application is a data controller can also control the meeting process; conference process, data manipulation area will display the corresponding annex added. Login mode system supports multiple conference registration mode, including IM login, Web login, mail sign-on; support anonymous FTP login telephone invitation. RUDP packet loss compensation using original technology, quality feedback, voice priority, packet loss compensation, auto down feature frames, etc., even in serious cases the network packet loss, but also have access to high quality. Hot Standby Cluster system uses a hot standby server cluster and automatically select the most "near" routing technology, completely solve the interoperability problems north and south; concurrent users unlimited expansion; 7 * 24 hours to ensure uninterrupted service. Conference management system supports Hurriyat Conference and two conference chair control mode; the free conference mode, speak, control authority for processing in accordance with a queuing mechanism; control mode with the President, the President has the privilege of centralized control, can process the entire conference schedule control and management. If the server supports the monitoring of transit service, the system administrator can set up monitoring related functions; in the conference chairman users can access user video conference room monitoring points; monitor user does not have permission to ordinary users of other meetings. System participant user information backup and recovery. ● technical characteristics → France famous UI Institute developed a new user-friendly user interface, making the operation more simple to use → P2P data transmission using advanced technology to support massive concurrent users, the number of online servers can achieve unlimited expansion → multilayer cascade stable, multi-server load balancing and backup, to ensure that the meeting was held → supports H.263, H.264, MPEG4 and other codec technology, adapt to the specific requirements of different users can be based on the difference user → network conditions, automatically detects and adjusts audio and video transmission data stream size → KaranSound developed UltraSync-AEQ audio codec technology, so that the sound is more clear and smooth → sound playback using self-developed echo suppression, automatic gain, noise cancellation, sound compensation system built efficient technologies → data engine module, remote share various data files and streaming media files → powerful WEB-based remote management capabilities, with a variety of master mode, to ensure orderly meeting → perfect H.323 protocol support, Karan soft MCU can with the major hardware terminal device interconnection technology products introduced CNKaran (New KAIRUN) DT4000 interactive telemedicine network security technology, excellent network support, providing efficient and reliable network to support telemedicine, tele-consultation; leading system The UltraSync (video and audio decoding and transmission technology), so doctors, patients feel superior video and audio enjoyment; a wide range of interactive ability of the system to provide more choice of calling methods; the development of advanced technology systems, seamless between the various operating system platforms connection; a good system scalability, compatibility and stability, with the full use of the limited resources provided by the prerequisite hardware, network video output and efficient high-volume transaction processing. Use DT4000 system, DICOM3.0 standard medical imaging with CT, magnetic resonance imaging, X-ray machines and other medical equipment can be taken quickly complete and correct instant transfer, sync, plus video and audio at the same time, an effective combination of the three, to ensure the quality and effectiveness of telemedicine. DT4000 has good data compatibility is provided with PACS, HIS and other data exchange and interactive interfaces to ensure that the use of the hospital's existing resources. Another advantage of the DT4000 telemedicine system is based on user needs and communication conditions, and provide proposals with different specifications of hardware, user-selected according to their actual situation. Kay-run company http://www.cnkaran.com new major clients: O1O-8277O9O9-8l8 1591O6O83O5 H.264 encoding technology and H.239 H.264 encoding technology was developed by ITU-T and ISO / IEC MPEG-expert group jointly set up a "Joint Video Team" The new proposal jointly developed (ITU-TH.264). It is the classic hybrid coding basic framework draws on the strengths of MPEG-4 video coding algorithm, it has a high coding efficiency: Compared to H.263 encoding saves 50% of the bit rate; strengthening delay restrictions and color for error handling mechanism and to enhance the decoding error recovery capabilities; improve the adaptability of the network (such as adaptability to mobile and IP networks), using layering technology, isolated from formal encoding and channel to consider the characteristics of the channel in the source coding process. H.239 is the main content of the video on the use of multi-channel video conference system, defines the use of role identity to achieve control, indication, and capability exchange mechanism. Mobile video late 1990s, began the rapid development of mobile communications. With the improvement of 3G technology in the mobile Internet has had the possibility to carry out video communications business, in this context, H.324M standard gradually come to the fore. At present, Japan's DoCoMo has established H.324M video communication networks, and the traditional H.320 and H.323 network to achieve interoperability. H.324M standard refers to the H.324 standard "moving parts" extension. H.324 protocol specifies how synchronous V.34Modem for POTS (PlainOldTelephone Systems) multimedia-based communications. In order to extend this wireless or mobile industry standard, mobile extension (H.324M) in H.324 and H.223 Annex C Annex A, B, C are done separately defined. 3GPP 3G network adoption H.324M suggested as a traditional video telephony standards, recommended by its adoption was named 3G-324M, and for voice, video, and made a number of multiplexed operation Requirement: GSM-AMR for audio One optional coding standard coding; mandatory ITUH.263 video coding standard; add H.223 Annex B to protect the multiplexed data. SIP-based video conferencing SIP (SessionInitiationProtocol, Session Initiation Protocol) is a IETF (Interne Engineering Task Force) made in 1999, IP telephony signaling protocol. It is used to initiate a session, the establishment and termination can control multiple players to participate in a multimedia session, and can dynamically adjust and modify the session properties, such as session bandwidth transmission media types (voice, video and data, etc.), the media codecs, support for multicast and unicast and so on. Compared with H.323 SIP, H.323 implementations follow the traditional telephony signaling mode, more mature, there have been a lot of H.323 products. H.323 line with the traditional design ideas communications, centralized, hierarchical control, easy to use H.323 protocol connected to the traditional telephone network. SIP draws on other Internet standards and protocol design, Internet follow consistent and concise in style, open, compatible and scalable principles, relatively simple, but its launch time is not long, the agreement is not very mature. Website: www.ctvhd.cn Tel: 13823196904 QQ: 2537602872