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| Digital Television |
Digital television is no longer a buzzword in the Broadcast Industry as television services around the world have almost completed the digitization process and the viewers are already experiencing the benefits of digital technology including High-Definition Television (HDTV). Digital technology offers immense opportunities to both broadcasters and viewers. Thanks to the rapid development of digital technology, broadcasters worldwide have been able to introduce a large number of new interactive applications in the television market besides a large number of entertainment programs over a single delivery platform. In addition, since digital technology permits a highly efficient exploitation of the frequency spectrum, the number of TV channels that can be broadcast using digital technology is significantly higher than with analogue technology. |
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| Digital Video Broadcasting – Terrestrial (DVB-T) : DVB-T is the most prevalent, covering Europe, Australia, New Zealand, Colombia, Uruguay and some countries of Africa. Several European countries have plans to complete the switchover to Digital by 2012. |
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DVB-T is the technological evolution and advance from analogue terrestrial television, which broadcasts land based (terrestrial) signals. The purpose of DVB_T, similar to digital versus analogue in other platforms such as cable, satellite, telecoms, is characterized by reduced use of spectrum and more capacity than analogue, better-quality picture, and lower operating costs for broadcast and transmission after the initial upgrade costs. A terrestrial implementation of digital television technology uses aerial broadcasts to a conventional antenna (or aerial) instead of a satellite dish or cable connection. |
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| Transmission |
DVB-T Technology is attractive because a large number of homes that can be covered with relatively little infrastructure. They are most popular in flat areas where there few man-made or natural obstacles that could block signals.
A DVB-T Transmitter is located with an omni-directional broadcast antenna at or near the highest topographical point in the intended coverage area. The workable radius can reach 50 to 70km. The transmitter covers a relatively large operating area and repeaters are applied as needed to extend or reinforce the signal. |
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| Reception |
DVB-T is received via a digital Set-Top Box (STB) that decodes the signal received via a small aerial antenna.
The DVB-T signals are delivered to the home using a Miniature Antenna and the STB. This type of TV signal distribution technology is also quick to deploy, compared to the alternative technology, i.e., Cable network.
Any household with a set-top-box, will be able to receive and view the channels of their choice. |
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