Digital radio broadcasting systems are typically designed for handheld mobile devices, like mobile-TV systems and unlike other digital TV systems which typically require a fixed directional antenna. ( discuss) ( February 2019)ĭigital audio radio service standards may provide terrestrial or satellite radio service. It has been suggested that this article should be split into a new article titled Digital radio broadcasting. In most cases, this would however increase the energy consumption of the receiver equipment.
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It also allows software radio implementations, where the transmission technology is changed just by selecting another piece of software. This may reduce noise and distortion induced in the electronics. This definition includes broadcasting systems such as digital TV and digital radio broadcasting, but also two-way digital radio standards such as the second generation ( 2G) cell-phones and later, short-range communication such as digital cordless phones, wireless computer networks, digital micro-wave radio links, deep space communication systems such as communications to and from the two Voyager space probes, etc.Ī less common definition is radio receiver and transmitter implementations that are based on digital signal processing, but may transmit or receive analog radio transmission standards, for example FM radio. microwave and radio frequency communication standards where analog information signals as well as digital data are carried by a digital signal, by means of a digital modulation method.
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.Īn older definition, still used in communication engineering literature, is wireless digital transmission technologies, i.e. However, analog radio (AM and FM) is still more popular and listening to radio over IP ( Internet Protocol) is growing in popularity. 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. In digital broadcasting systems, the analog audio signal is digitized, compressed using an audio coding format such as AAC+ ( MDCT) or MP2, and transmitted using a digital modulation scheme.
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