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| quikcafe.com | History of radio | Discovery and development | Wireless age | 20th century | Uses of radio | Audio | Data | Digital Radio |
Digital Radio
Digital radio describes radio technologies which carry information
as a digital signal, by means of a digital modulation method. The
most common meaning is digital audio broadcasting technologies, but
the topic may also cover TV broadcasting as well as many two-way
digital wireless communication technologies. The acronym DAB
(Digital Audio Broadcasting) is synonymous with the Eureka 147
standard.One-way digital radio standardsOne-way standards are those used for broadcasting, as opposed to those used for two-way communication. While digital broadcasting offers many potential benefits, its introduction has been hindered by a lack of global agreement on standards. The Eureka 147 standard (DAB) for digital radio is the most commonly used and is coordinated by the World DMB Forum, which represents more than 30 countries. This standard of digital radio technology was defined in the late 1980s, and is now being introduced in many countries. Commercial DAB receivers began to be sold in 1999 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.[1] There have been criticisms of the Eureka 147 standard and so a new 'DAB+' standard has been proposed. |
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To date the following standards have been defined for one-way
digital radio:Digital audio broadcasting systemsEureka 147 (branded as DAB) 'DAB+' FM band in-band on-channel (FM IBOC): HD Radio (OFDM modulation over FM and AM band IBOC sidebands) FMeXtra (FM band IBOC subcarriers) Digital Radio Mondiale extension (DRM+) (OFDM modulation over AM band IBOC sidebands) 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 Satellite radio: WorldSpace in Asia and Africa Sirius in North America XM radio in North America MobaHo! in Japan and the Republic of (South) Korea ISDB-TSB Systems also designed for digital TV: DMB DVB-H Low-bandwidth digital data broadcasting over existing FM radio: Radio Data System (branded as RDS) Radio pagers: FLEX ReFLEX POCSAG NTT Digital television broadcasting (DTV) systems Digital Video Broadcasting (DVB) Integrated Services Digital Broadcasting (ISDB) Digital Multimedia Broadcasting (DMB) Digital Terrestrial Television (DTTV or DTT) to fixed mainly roof-top antennas: DVB-T (based on OFDM modulation) ISDB-T (based on OFDM modulation) ATSC (based on 8VSB modulation) T-DMB Mobile TV reception in handheld devices: DVB-H (based on OFDM modulation) MediaFLO (based on OFDM modulation) DMB (based on OFDM modulation) Multimedia Broadcast Multicast Service (MBMS) via the GSM Edge and UMTS cellular networks DVB-SH (based on OFDM modulation) Satellite TV: DVB-S (for Satellite TV) ISDB-S 4DTV S-DMB MobaHo! |
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| quikcafe.com | History of radio | Discovery and development | Wireless age | 20th century | Uses of radio | Audio | Data | Digital Radio |