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Home » Other Nokia Products » Digital Television

Digital Television
Digital television is a system of telecommunication used for broadcasting and receiving the moving pictures and sound with the help of digital signals not like the analog signals which are used by the analog TV. The digital television was introduced during the late 1990s. This technology helped the broadcasting of television business and consumer electronics industries as offering new financial opportunities. In the current use of digital television there are two basic formats which include 280 × 720 pixels in progressive scan mode (abbreviated 720p) or 1920 × 1080 pixels in interlace mode. A broadcaster often uses a standard definition digital signal in place of HDTV signal.

The reason behind this is that the present conventions allow the bandwidth of a DTV channel to be subdivided into different sub channels. These channels provide multiple feeds of completely different type of programming on the same channel.

There are varied ways of receiving digital television one of the traditional means of receiving the digital television is with the help of antenna. This method is also called as Digital Terrestrial Television or the DTT. With the help of DTT the viewers are limited to any type of channels the antenna picks up. Signal quality will also vary. Some other ways of receiving the digital television is the digital cable and the digital satellite. There are some countries where TV signals transmissions are usually achieved by the digital MMDS and the microwaves which are used.

There are certain other standards also including the DMB and DVB-H which are devised to allow handheld devices such as mobile phones to receive TV signals. One other way of receiving the digital television is IPTV, which suggests receiving TV through Internet Protocol with guaranteed quality of service. Ultimately an option way is to receive TV signals through the open Internet infra-structure, usually referred to as Internet TV. In the present scenario without thinking of how the viewers receive the DTV many pick the digital television through a set top box which is used for decoding the digital signals into the signals that analog the television. This is achieved by purely using a television as a monitor. In the present scenario different television sets with integrated receivers are available — these are known as iDTVs.

Some of the signals received by the television carry the encryption and specify use conditions. The receiving of signals is backed by the force of law under the WIPO Copyright Treaty and national legislation that implements the digital television like the U.S. Digital Millennium Copyright Act. Access to encrypted channels can be controlled by a detachable smart card, like through the Common Interface (DVB-CI) standard for Europe and via Point of Deployment (POD) for IS or named differently CableCard.

The digital television also provides the scope of interaction that happens between the viewer and the digital television system. This interaction can be taken in different manners depending on the part of the television which is concerned. It can be an interaction with the STB only.

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