Article by hi joiney
Details of the key technologies in IPTV encoding, digital rights management (DRM) technology, content delivery network (CDN), electronic program guide (EPG) technology, set-top boxes (STB) technology, IPTV IPTV standardization in the telecommunications industry standards circumstances relevant IPTV broadcasting industry standards, as well as the current IPTV technology research and standards development work in China. 1, Introduction IPTV offers both live TV (LTV), video on demand service (VOD), Near VOD (NVOD), time-shifted TV on Demand (TSTV), TV Web surfing (Web-TV) and other basic services, but also provide services such as video instant messaging, SMS TV, interactive advertising, online games, online video shopping and other value-added services, as these operations for the TV end, the audience and very wide, and IPTV services are generally considered very good development prospects. However, traditional TV is a broadcast service, simple operation, response time, image stability and reliable service. In contrast, IPTV also has access to insufficient bandwidth, picture quality is not high, higher user fees, products, and many weaknesses immature. IPTV to become a real business can operate, they must guarantee at or near its level of quality of traditional television. To achieve this goal, from content creation to the terminal to receive the entire implementation process need to use many of the key technologies, including coding, digital rights management (DRM), content distribution network (CDN), electronic program guide (EPG), set-top box (STB) technology, these technologies will require in-depth study and standardization of these technologies are only just beginning. 2, IPTV key technologies 2.1 Coding Coding technology is essential to use multimedia communications technologies. Multimedia communication is a distinctive feature of a very large amount of information to be transmitted, especially video data, the encoding even greater extent, influence the quality of video coding technology in IPTV, therefore the position is very important. As people on the video coding technology based on the deepening, the results have a number of video coding technology was born. Some even have been the International Telecommunication Union (ITU) and International Organization for Standardization (ISO) accepted as international standards. Which have been published are: H.261, H.262, H.263, H.264 and MPEG-1, MPEG-2, MPEG-4 and so on. Currently, IPTV services already carried out at home and abroad are basically using the MPEG-2 encoding. AVS was developed by China with independent intellectual property rights of a new generation of encoding. At present, the specifications of the ongoing formulation of AVS, AVS video mainly for high-definition television, high-density optical storage media applications such as video compression. Addition to video coding technology, the current Internet streaming media formats using more major companies in the United States RealNetworks RealMedia, Apple’s QuickTime, Microsoft’s WindowsMedia, and Macromedia’s ShockWaveFlash. 2.2 Digital Rights Management (DRM) technology IPTV digital multimedia content is the most critical sources of programming. Data, digital rights management (DigitalRightsManagement, referred to as DRM) technology for content providers to protect their private videos, music or other data to provide a technological means of copyright. It works, the media production program production phase in the copyright information embedded into media content and its protection by encryption. With DRM technology will enable each platform (whether Internet, streaming media or interactive digital TV) and content providers are assured to provide more content, more flexible programming sales methods, while effective protection of intellectual property rights. When the need to verify the legitimacy of the information media. And through technical methods or means of copyright information from the media to be read out, so that copyright information can be than right. Currently, the most widely used DRM technology is digital watermarking (DigitalWatermark). It uses a certain algorithm, the protected digital format, music, songs, pictures or video embedded in some of the landmark information (referred to as digital watermarking), to achieve that copyright infringement case and tracking purposes. Digital watermark information generally includes the author’s serial number, company logo and some text messages with special significance. 2.3 Content Distribution Network (CDN) technology Content delivery network (CDN) is only a first order to speed up the user’s Internet access speed network set up, generally established by the various sites themselves. The aim is, through the CDN to distribute Internet video and Web content to CDN nodes near the client, to a certain extent, to ensure end to end quality of service, improve user response speed. CDN is not because of existing streaming media files for large size designed, and therefore can not be directly used to carry IPTV services, the characteristics required for IPTV business, the introduction of advanced technologies for construction and management. For example, the need to store huge amounts of data for the IPTV features, we can use blade servers, NAS, SAN and other storage equipment, advanced configuration, advanced storage technology and advanced storage management to transformation of the CDN network. For IPTV and high-quality real-time requirements, can be used will depend on the original Internet network transmission to transmit through the line and will slice and use of P2P file transfer mechanism to resolve. The CDN network management, may establish a reasonable content management solution to improve the efficiency of CDN network, change from passive management to active management. For example, media content can be divided into live content, on-demand content to be treated separately. Re-demand content under demand rate will be divided into cold / hot chip to be treated separately. 2.4 Electronic Program Guide (EPG) technology Electronic program guide (EPG) TV navigation system that is mainly used to describe all the programs available to viewers of information, it is important technologies constitute one of interactive television. In the IPTV business, the user can understand the EPG to the name of TV broadcasting time and content of the outline of related information and programs to realize fast retrieval and access to video on demand channel selection or other operation. In addition to the navigation outside of television, electronic program guide can also provide users with the text, graphics and images consisting of man-machine interface to achieve a variety of value-added services navigation.