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The UK currently has the world's biggest digital radio network, with about 500 transmitters, two nationwide DAB ensembles and 48 local and regional DAB ensembles, broadcasting over 250 commercial and 34 BBC radio stations; about 100 stations can be received in London. On DAB digital radio most listeners can receive around 30 additional stations.
DAB MUX 1 Digital Radio Cibicom is the gatekeeper of this multiplex broadcasting commercial national radio. DAB MUX 2 National public service stations. DR's 7 channels (including the 10 regional variations of DR P4), as well as the privately owned, public service channel Radio4. DAB MUX 3 Regional and local commercial radio.
The simplest system is named DAB Digital Radio, for Digital Audio Broadcasting, and uses the public domain EUREKA 147 (Band III) system. DAB is used mainly in the UK and South Africa. Germany and the Netherlands use the DAB and DAB+ systems, and France uses the L-Band system of DAB Digital Radio.
A radio station operating in DAB hybrid mode or extended hybrid mode shall identify its digital signal, including any free multicast audio programming streams, in a manner that appropriately alerts its audience to the fact that it is listening to a digital audio broadcast.
However, after 11 years, regional large cities such as Townsville and Ballarat still do not have DAB. [1] The national government owned television/radio networks, the ABC and SBS , and the commercial radio stations in each market provide many of their services and a few digital-only services on the digital platform.
In London there are already more than 100 different digital stations available. [1] In addition to DAB and DAB+, radio stations are also broadcast on digital television platform as well as internet radio in the UK. Digital radio ensemble operators and stations need a broadcasting licence from the UK's media regulator Ofcom to broadcast.
DAB radio stations work differently from AM or FM stations: a single DAB station transmits a wide 1,500 kHz bandwidth signal that carries from 9 to 12 channels from which the listener can choose. Broadcasters can transmit a channel at a range of different bit rates , so different channels can have different audio quality.
DAB has the potential to provide higher quality sound than FM (although many stations do not choose to transmit at such high quality), has greater immunity to radio noise and interference, makes better use of scarce radio spectrum bandwidth and provides advanced user features such as electronic program guides.