Digital Audio Broadcasting

Digital Audio Broadcasting (DAB) is a way of sending radio using digital signals instead of analogue signals. It is used in many countries, including the United Kingdom and parts of Europe.

How it works

DAB sends radio stations in a digital form. This means that more stations can be put on one radio frequency, using a system called a multiplex. Digital signals can also give clearer sound and extra information, such as the name of the song or programme.

DAB+

A newer version called DAB+ is used in many places. DAB+ uses better technology, so the sound can be clearer and more stations can be broadcast. Some older radios can receive DAB but not DAB+.

In the United Kingdom

The UK uses both DAB and DAB+. Radio stations are put together on local, regional and national multiplexes. People can listen using DAB radios at home, at work, or in cars. Some stations are now digital-only and do not broadcast on FM or AM.

Advantages

• More radio stations
• No background hiss
• Extra information can be shown on the radio screen
• Easier tuning (stations appear by name)

Disadvantages

• Signals can cut out if the reception is weak
• Some older radios cannot receive DAB+
• Sound quality depends on how much space a station is given on the multiplex

Related pages

• Radio
• Frequency modulation
• Amplitude modulation