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It is usually connected to the TV set or incorporated in the TV set. The main features of a DTV receiver may be classified as follows: decodes the incoming digital signal; verifies access rights and security levels; displays cinema quality pictures on the TV set; outputs digital surround sound; processes and renders Internet and interactive TV ...
Then, to ensure that viewers who did not wish to buy a new digital television set could continue to receive conventional television broadcasts, it dictated that the new ATV standard must be capable of being simulcast on different channels. The new ATV standard also allowed the new DTV signal to be based on entirely new design principles.
Some countries have also introduced digital television and ended analog over-the-air transmissions. Most new TVs feature a digital tuner which allows reception of digital over-the-air TV without need of an external device such a converter box. If using a TV set without a digital tuner, an external converter box must be purchased and used.
An ATSC (Advanced Television Systems Committee) tuner, often called an ATSC receiver or HDTV tuner, is a type of television tuner that allows reception of digital television (DTV) television channels that use ATSC standards, as transmitted by television stations in North America, parts of Central America, and South Korea.
The five main ATSC formats of DTV currently [when?] broadcast in the U.S. are: . Standard definition—480i, to maintain compatibility with existing NTSC sets when a digital television broadcast is converted back to an analog one [citation needed] —either by a converter box or a cable/satellite operator's proprietary equipment
In June 2008, participants of the 6th ASEAN Digital Broadcast Meeting from seven south-east Asian countries (including Thailand) agreed to finalise the specifications of the DTV set-top box for use within ASEAN, and also set up an ASEAN HD Centre to provide training on HDTV content to broadcasters in the region. [43]
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Users of analog VCRs, DVRs, or other recording devices which lacked a digital tuner had a unique problem of no longer being able to record programs across multiple channels. In order to record multiple DTV channels, the viewer had to use an external tuner box and set the device to record the output from that box, typically L-1 for the line input.