就是我幫老弟打的一些內容啦!其實應該還算簡單啦~
只是有一些字、專有名詞不太懂而已，
所以，辛苦老弟啦!其實也有圖啦!
只是我沒把它弄上來而已，因為我還要自己弄咧!
懶得弄，所以只有內容囉!
等到哪天有空，再跟老弟借來弄囉!
Broadband access providers supply the high-speed data connection that can trandfer the digital video television signals. Service providers identify and control the connections between the viewing devices and the content providers(media sources). Media content providers create information that people want to view or obtain.
The kay types of IP television viewing devices include multimedia computers, television adapter boxes, multimedia mobile telephones and IP televisions. Multimedia comprters have video processing and audio processing capablities. Television adapters convert digital television signals into standard television RF connections that allow standard televisions to watch IP television channels. IP televisions are devices that are specifically designed to watch television channels through the Internet without the need for adapter boxes or media gateways.
Figure 1.1 shows several types of IP television viewing devices. This diagraam shows that some of the options for viewing devices include multimedia computers, television adapters, IP Teleisions and mobile telephones. Multimedia computers (desktops and laptops) allow some multimedia computers to watch Internet television programs without the need for adapters provided they have the multimedia browsers that have the apropriate media plug-ins. Television adapters connect standard television RF video and audio connectors to data jacks or wireless LAN connections. IP Televisions can be directly connected to data jacks or wirless LAN connections. Mobile telephones that have multimedia capabilities and if the mobile telephone system they use provide the broadband web along with the necessary media gateways.
Broadband access providers transfer high-speed data to the end users. The type of technology used by broadband access providers can play an important part in the ability and/or quality of IP television services.
Figure 1.2 shows the key types of broadband access providers that can be used to provide Internet television service This diagram shows that some of the common types of broadband access sstems that are available include powerline data ddistribution, cable modems, digital subscriber Lines(DSL) and wireless local area network systems(3G wireless, WLAN, MMDS, and LMDS).
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Internet television service providers(ITVSPs) help customers find Internet television channels and manage connections between media sources. While it is possible in some cases for end users to directly connect to a media source by using an IP address or even a web link, Internet television service providers may also provide connections to subscription controlled television sources. For this role, the IP television service provider makes a business relationship with the media source. The IP television service provider may pay the media provider from funds it collects from their end user's.
Figure 1.3 shows that Internet television service providers(ITVSPs) are primarily made of computers that are connected to the Internet and software to operate call processing and other services. In this diagram, a computer keeps track of which customers are active(registration) and what features and services are authorized. When television channel requests are pocessed, the ITVSP sends messages to gateways via the Internet allowing television channels to be connected to a selected media gateway source(such as television channels).These media gateways transfer their billing details to a clearinghouse so the ITVSP can pay for the gateway's usage. The ITVSP then can use this billing information to charge the customer for channels viewed.
Content providers create different types of television media programs that are distributed through a variety of media distribution channels. Common program distribution channels include movie theaters, pay per view, airlines and specialty channels, video rentals, and telvision networks. Traditional telvision network content sources include movies, telvision programs, sports channels, new services and other information sources.
Telvision networks have tranditionally been a closed distribution system where the television network determined which program source could reach viewers. Television networks such as cable television, satellite systems and VHF/UHF transmission systems had a limited mumber of channels(up to serveral hundred channels).
IP television systems can be provided through broadband communication systems that can reach content providers and viewers in anypart of the world. This allows IP television service providers to offer many new content programs that have not been available for standard television distribution systems. New types of content sources include personal media channels, global television channels, interactive media, public video sources and private video sources.
Personal media chanels allow viewers to create their own television channel, upload their content such pictures and videos and share their content with other IP television viewers. IP television systems provide access to television channels throughout the world. Some of the more popular global televisio channels that are available on IP telvision include news channels,business channels and music television. IP televisions may provide access to interactive media such as games, chat rooms and e-commerce shopping.Governments and public groups have begun providing real time video access to public sources such as courtrooms, popular public places and public web cams. Private video sources are provided by companies or people who are willing to provide and pay to have their signals available on television. Some common private television channels include religious groups, education sources and sports channels.
Figure 1.4 shows some of the existion an new types of IP television content providers. This diagram shows that IP television content includes traditional television content sources such as movies, new services, sports, education, religious and other forms of one-way informationcontent. A new type of IP television content include personal media, global television channels, interactive media, public video sources and private video sources.
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