IPTV is an infrastructure that utilizes a broadband cable television network, with home television as the main terminal appliance, and provides a variety of digital media services including television programs through Internet Protocol. Features are shown in:
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1) Users can get high quality (near DVD level) digital media services.
2) Users can have a wide range of degrees of freedom to choose video programs from various websites on the Broadband IP network.
3) Achieve substantial interaction between media providers and media consumers. The playback platform adopted by IPTV will be a typical representative of a new generation of home digital media terminals. It can configure multiple multimedia service functions according to users' choices, including digital TV programs, visual IP phones, DVD/VCD playback, Internet tours, and emails. And a variety of online information consulting, entertainment, education and business functions.
4) Providing a vast emerging market for network developers and program providers. At present, China's communications industry is developing rapidly, and users are increasingly demanding information services, especially broadband video information. It can be said that China has basically possessed the technical conditions and market conditions for vigorously developing IPTV.
Generally speaking, IPTV and digital TV have similarities and differences. The technical experts of Fiberhome Networks explained the similarities and differences between the two aspects.
Technical system
The IPTV system is also called interactive TV. Its system structure mainly includes subsystems such as streaming media service, program editing, storage and authentication and billing. The main storage and transmission content is streaming media files with MP-4 as the encoding core, based on IP. For network transmission, a content distribution service node is usually set at the edge, and a streaming media service and a storage device are configured. The user terminal may be an IP set top box + a television set or a PC.
The broadcast network of cable digital TV adopts the HFC network system, which is the same as the traditional analog cable TV network architecture. In the case of new interactive services (such as VOD), the network system will be different. The cable digital TV VOD system mainly includes VOD service, program editing, storage and authentication billing system. The main storage and transmission content is MP-2TS stream. It adopts IPOVERDWDM technology and is based on DVDIP optical network transmission. It is different from the distributed architecture of IPTV. The cable digital TV VOD system adopts a centralized service architecture. It does not need to configure a video server for content storage and distribution at the front end of the HFC. It only needs to place DWDM receivers and GAM modulation equipment, which greatly reduces the system. The operating cost and management complexity, the user terminal is a digital set-top box + TV. At present, the digital TV industry chain has basically formed in China, and there are numerous digital TV set-top box manufacturers, front-end equipment manufacturers and system integrators.
2. Business content
IPTV has a very flexible interactive feature, because it has the inherent advantage of symmetric interaction of the IP network, and its programs are in the network, and can be broadcast, multicast, and unicast. It can flexibly implement various functions such as electronic menu, program reservation, real-time fast forward, fast rewind, terminal account and billing management, and programming. In addition, other content services based on the Inter network can also be launched, such as online games, e-mail, and electronic banking.
Cable digital TV adopts broadcast mode. If you want to implement video on demand, you must transform the original HFC broadcast network in both directions. Under normal circumstances, only the interactive channel about life information is opened. If digital TV is to support video on demand, it is also supported by the IP network that CALBEMODEM enters. In fact, it is IPTV. This is the model of digital IPTV system in Hangzhou. From the perspective of the content services provided, cable digital TV is not as good as IPTV.
3. Main advantages
The main selling point of IPTV is interaction and the expansion of services within the Inter network. IPTV also makes it easy to combine TV services with Internet browsing, e-mail, and a variety of online information consulting, entertainment, education, and business functions to gain a competitive edge in the future.
The selling point of digital TV is mainly HD image quality.
4. User group
Both market users are family users, but relying on cable and relying on broadband to bring benefits to users.
5. Development prospects
For a long time, there will be a situation where both coexist. The development of digital television is a long-planned policy of the country. IPTV is to add a program channel to many TV programs and does not replace cable digital TV. Because IPTV's real-time broadcast has a certain cost of use, it is of little significance to completely replace IPTV with cable or satellite TV. However, because of the many attractive features of IPTV, it is still very active as an independent program channel. From the perspective of information industry development, IPTV is still the biggest entry point for triple play.
In 2005 and 2006, the State Administration of Radio, Film and Television issued four IPTV national licenses and local licenses for Shanghai Wenguang, CCTV International, Southern Broadcast Media and Zhejiang Radio and Television Group.
Users can enjoy IPTV services in three ways at home:
1. computer; 2. network set-top box + ordinary TV; 3. mobile phone
Main technique
MPEG-4 is defined by the Moving Picture Experts Group (MPEG). Compared to MPEG-1 and MPEG-2, MPEG-4 is more suitable for interactive AV services and remote monitoring.
At present, our country has built an iptv commercial network with China's independent AVS decoding technology as its core in Dalian, and it has been put into operation by Liaoning Netcom Dalian Branch.
Related
Digital TV: It means that all the links from the studio to the transmission, transmission and reception use digital TV signals or all the signal propagation to the system is transmitted through the digital stream composed of 0 and 1 digit strings.
Characteristics
IPTV is a complete set of application service solutions, a service system, not a figurative product. It is also the pride of the NGN era. It should be understood from the perspective of NGN, and it is only the initial stage of IPTV. At this time, the IPTV expression is IPTV with Chinese characteristics.
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