Editing Digital radio (section)

===Broadcast standards===
[[Digital audio radio service]] standards may provide [[terrestrial radio|terrestrial]] or [[satellite radio]] service. Digital radio broadcasting systems are typically designed for handheld mobile devices, like [[Mobile television|mobile-TV]] systems and unlike other [[digital TV]] systems which typically require a fixed directional antenna. Some digital radio systems provide [[in-band on-channel]] (IBOC) solutions that may coexist with or simulcast with analog AM or FM transmissions, while others are designed for designated radio frequency bands. The latter allows one wideband radio signal to carry a [[statistical multiplexing|multiplex]] of several radio-channels of various bitrates as well as data services and other forms of media. Some digital broadcasting systems allow  [[single-frequency network]] (SFN), where all terrestrial transmitters in a region sending the same multiplex of radio programs may use the same frequency channel without self-[[Interference (communication)|interference]] problems, further improving the [[system spectral efficiency]].

While digital broadcasting offers many potential benefits, its introduction has been hindered by a lack of global agreement on standards and many disadvantages. The DAB [[Eureka 147]] standard for digital radio is coordinated by the [[World DMB Forum]]. This standard of digital radio technology was defined in the late 1980s, and is now being introduced in some European countries. Commercial DAB receivers began to be sold in 1998 and, by 2006, 500 million people were in the coverage area of DAB broadcasts, although by this time sales had only taken off in the [[UK]] and [[Denmark]]. In 2006 there are approximately 1,000 DAB stations in operation.<ref>{{cite web|url=http://www.worlddab.org/benefits.php|title=Digital Broadcast - bringing the future to you<!-- Bot generated title -->|archive-url=https://web.archive.org/web/20071017232328/http://worlddab.org/benefits.php|archive-date=2007-10-17}}</ref> There have been criticisms of the Eureka 147 standard and so a new '[[Digital Audio Broadcasting#DAB+|DAB+]]' standard has been introduced.

The DRM standard has been used for several years to broadcast digitally on frequencies below 30&nbsp;MHz (shortwave, mediumwave and longwave). Also there is now the extended standard DRM+, which is designed for VHF bands.<ref>{{cite web|url=http://www.drm.org/technical-info/|title=Digital Radio Mondiale - Technical Info|website=www.drm.org|access-date=29 April 2018|url-status=live|archive-url=https://web.archive.org/web/20171023020536/http://www.drm.org/technical-info/|archive-date=23 October 2017}}</ref> Tests of DRM+ has been made in countries such as in Brazil, Germany, France, India, Sri Lanka, the UK, Slovakia, Italy (incl. the Vatican), as well as Sweden.<ref>{{cite web|url=http://www.drm.org/drm-testing-gets-underway-today-in-stockholm-sweden/|title=Digital Radio Mondiale - DRM+ Testing gets underway today in Stockholm, Sweden|website=www.drm.org|access-date=29 April 2018|url-status=live|archive-url=https://web.archive.org/web/20180202190244/http://www.drm.org/drm-testing-gets-underway-today-in-stockholm-sweden/|archive-date=2 February 2018}}</ref>

The two pan-European associations for community radio ''Community Media Forum Europe (CMFE)'' and ''AMARC Europe'' have stated to the European Commission that FM radio should be retained for local radio. In case of a future digital transition DRM+ would be the choice.
<ref>{{cite web|url=https://digitalradioinsider.blogspot.com/2013/10/community-radio-makes-its-stand-for-fm.html|title=Community Radio Makes Its Stand for FM Radio in Brussels |access-date=8 April 2025}}</ref>
<ref>{{cite web|url=http://www.public-service.net/docu/digiradio2014open.pdf|title=Community Radio: FM and Digitalization. Future Distribution Platforms for Community Radio in Europe (Green paper for CMFE (2014)|website=Public servicerådet |access-date=8 April 2025}}</ref>

To date the following standards have been defined for one-way digital radio:

====Digital audio broadcasting systems====
* [[Eureka 147]] (branded as [[Digital Audio Broadcasting|DAB]])
* [[Digital Audio Broadcasting#DAB+|DAB+]]
* [[5G Broadcast]]
* [[ISDB-TSB]]
* [[Internet radio]] (Technically not a true broadcast system)
* T-DMB V-Radio
* '''AM band [[in-band on-channel]] (AM IBOC):'''
** [[HD Radio]] (AM IBOC [[sideband]])
** [[Digital Radio Mondiale]] (branded as DRM) for the short-, medium- and long-wave bands
* '''FM band [[in-band on-channel]] (FM IBOC):'''
** [[HD Radio]] (OFDM modulation over AM and FM band [[IBOC]] [[sideband]]s)
** [[FMeXtra]] (FM band [[IBOC]] [[subcarrier]]s)
** [[Digital Radio Mondiale]] extension (DRM+) (OFDM modulation over AM band [[IBOC]] [[sideband]]s)
** Convergent Digital Radio (CDR) (OFDM modulation over FM band [[IBOC]] [[sideband]]s)
* '''[[Satellite radio]]:'''
** [[WorldSpace]] in Asia and Africa
** [[Sirius XM Radio]] in North America
** [[MobaHo!]] in Japan and the Republic of (South) Korea
* '''Systems also designed for digital TV:'''
** [[Digital Multimedia Broadcasting|DMB]]
** [[DVB-H]]
** [[ISDB-T]]
** [[Digital Terrestrial Multimedia Broadcast|DTMB]]
* '''Low-bandwidth digital data broadcasting over existing FM radio:'''
** [[Radio Data System]] (branded as RDS)
* '''Radio [[pager]]s:'''
** [[FLEX (protocol)|FLEX]]
** [[ReFLEX]]
** [[POCSAG]]
** [[Nippon Telegraph and Telephone|NTT]]

====Digital television (DTV) broadcasting systems====
* [[Digital Video Broadcasting]] (DVB)
* [[5G Broadcast]]
* [[Integrated Services Digital Broadcasting]] (ISDB)
* [[Digital Multimedia Broadcasting]] (DMB)
* '''[[Digital terrestrial television|Digital Terrestrial Television]] (DTTV or DTT) to fixed mainly roof-top antennas:'''
** [[DVB-T]] (based on [[OFDM]] modulation)
** [[Integrated Services Digital Broadcasting|ISDB-T]] (based on [[OFDM]] modulation)
** [[ATSC Standards|ATSC]] (based on [[8VSB]] modulation)
** [[T-DMB]] (based on [[OFDM]] modulation)
** [[Digital Terrestrial Multimedia Broadcast]] (DTMB) (based on [[OFDM]] modulation)
* '''[[Mobile TV]] reception in handheld devices:'''
** [[DVB-H]] (based on [[OFDM]] modulation)
** [[MediaFLO]] (based on [[OFDM]] modulation)
** [[Digital Multimedia Broadcasting|DMB]] (based on [[OFDM]] modulation)
** [[Multimedia Broadcast Multicast Service]] (MBMS) via the [[GSM]] [[Enhanced Data Rates for GSM Evolution|EDGE]] and [[UMTS]] cellular networks
** [[DVB-SH]] (based on [[OFDM]] modulation)
** [[China Multimedia Mobile Broadcasting]] (CMMB) (based on [[OFDM]] modulation)
* '''[[Satellite TV]]:'''
** [[DVB-S]] (for [[Satellite TV]])
** [[Integrated Services Digital Broadcasting|ISDB-S]]
** [[4DTV]]
** [[S-DMB]]
** [[MobaHo!]]
** Advanced Broadcasting System-Satellite (ABS-S)

See also [[software radio]] for a discussion of radios which use [[digital signal processing]].