A TV tuner is a component responsible for receiving the TV signals in a TV set. There are several TV standards throughout the world, for example the PAL standard in Europe (you can read more in-depth information about TV standards over here). In order to process a TV signal, the TV tuner is supposed to support the respective broadcast standard.
Most of the TV sets available on the market nowadays, come with Multinorm TV tuners which support the reception of multiple TV broadcasting standard and permit to be operated on an indoor aerial / roof antenna or by cable.
There are also TV sets available which feature an integrated satellite tuner (also known as Sat-Receiver).
Since the digital revolution is not going to exclude the TV broadcasting, one can also see an increasing number of TV set that provide an integrated DVB receiver entering the market.
Today, there are the following DVB standards:
· DVB-C (Digital Video Broadcasting Cable), standard for digital cable broadcasting.
· DVB-S (Digital Video Broadcasting Satellite), standard for digital satellite broadcasting.
· DVB-T (Digital Video Broadcasting Terrestrial), standard for digital terrestrial broadcasting.
Note: At the present time, there is no DVB receiver supporting all DVD broadcasting standards yet. The ones currently available can merely decode respectively one of the aforementioned DVD broadcasting standards.
There are also some TV sets which hold several tuners at once (for instance 2 x antenna/ cable or 1 x antenna/ cable and 1 x DVB-T). For that reason, these TV sets can display 2 TV channels on the TV screen at once by using Picture in Picture or Splittscreen function. [AB]