Digital Terrestrial Television received through an aerial.
Digital Terrestrial Television, often abbreviated to DTT, employs digital broadcasting to transmit television from terrestrial transmission towers to a conventional aerial.
Freeview is the generic name used for marketing free-to-view digital terrestrial television in the UK.
In the UK, and many other countries, digital broadcasts are transmitted between the UHF channels currently occupied by analogue television signals.
The use of digital compression enables around six digital channels to be broadcast in the frequency space of a single analogue channel.
There are plans to eventually switch off the analogue channels to free up valuable radio frequency spectrum and release it for other broadcasting or wireless communication applications.
The digital standard used in the UK and many other countries is known as DVB-T.
A group of channels, including interactive services and other data, are transmitted in a multiplex on a particular frequency.
The UK has adopted MHEG as the standard for interactive applications on digital terrestrial television. Although early receivers included a modem, there is no return path associated with digital terrestrial television in the UK.