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.

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.

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+.

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.

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

• 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

• Radio
• Frequency modulation
• Amplitude modulation