A lesson on digital TV

A lesson on digital TV

Introduced in the late 1990s, digital TV or DTV is a new method of sending and receiving audio and video through digital signals which aims to free up the broadcast spectrum so it can be useful to more important services for public security and safety or more advanced wireless services. Multicasting is used in this technology. Multicasting provides one channel that can now have several variations, for example channel 7 for an analog TV can become 7-1, 7-2, 7-3 and so on. With this viewers can now experience lesser interference gaining a better reception, clearer sound and image quality, new channels and features.
The transition to DTV in several developed countries such as the United States and United Kingdom have had started in 2007. In the United Kingdom, the Office of Communications reported that there are about 22.2 million homes using digital TV. From 86.1% of the 3rd quarter, multichannel take up increased to 87.6% for the 4th quarter, according to the Digital Television Progress Report of 2007. This is attributed to the British Government’s move of switching off analog transmitters region by region.
In the United States, the Federal Communication Commission plans to complete the migration by February 2009. Released in March 2007, a new order mandated that all TVs manufactured in the country were required to have digital tuners. Analog TVs can still be used and the Commission released information on the different equipments that households need to have for their analog TVs to receive digital signal.
Several Digital TV providers have emerged in the US, including Freeview, Sky Digital and BT Vision. Freeview, more commonly known as Digital Terrestial TV or DTT, provides 60 channels of TV and radio which are broadcasted free with no installation necessary. For some, however the will probably need to buy a new TV. Channel line-up is limited as the more popular ones are not available for free, also.
Sky Digital, on the other hand offers more channels such as Sky One, Paramount Comedy, and a range of about 200 channels. Unlike Freeview, you need an engineer to install the satellite dish. Also, a digibox and your phone line are then attached to your TV which will allow you to access the interactive services and to verify payment for pay per view channels. Sky Digital also offers broadband internet access, which are also a few things why it is quite better than Freeview.
The BT Total Broadband subscription offers you the high quality box that comes with it. Now, you can catch up with the shows you might have missed from the last seven days, and even pause live TV shows! With Video-on-demand from BT Vision, you can now save up to 80 hours of programming. Now, you can watch your favorite TV show over and over! Without interruptions, without even worrying about the others. Now you can have a clearer television that can provide you with better sound, better pictures with better reception with new channels and unbeatable features. All thanks to IPTV, the future is now within reach.

Article Source: http://www.articlesfeed.com

Angus Findlay is author of this article on Digital tv. Find more information about Freeview here.

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