Digital radio

Digital radio is the use of digital technology to transmit and/or receive across the radio spectrum. They may refer to digital transmission by radio waves, including digital broadcasting, and especially to Digital audio radio services.

The term is also applied to radio equipment using digital electronics to process analog radio signals.

In digital broadcasting systems, the analog audio signal is digitized, compressed using formats such as MP2, and transmitted using a digital modulation scheme. The aim is to increase the number of radio programs in a given spectrum, to improve the audio quality, to eliminate fading problems in mobile environments, to allow additional datacasting services, and to decrease the transmission power or the number of transmitters required to cover a region. However, analog radio (AM and FM) is still more popular and listening to radio over IP () is growing in popularity.

In 2012 four digital wireless radio systems are recognized by the International Telecommunication Union: the two European systems Digital Audio Broadcasting (DAB) and Digital Radio Mondiale (DRM), the Japanese ISDB-T and the in-band on-channel technique used in the US and Arab world and branded as HD Radio.

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