Radios Golden Years: The Encyclopedia of Radio Programs, 1930-1960 A Thirty-Year History of Programs Carried on National Radio Networks in the United States, 1926-1956. Radio Drama: A Comprehensive Chronicle of American Network Programs, 1932-1962 Radio Program Openings and Closings, 1931-1972 Radio Programs, 1924-1984: A Catalog of over 1800 Shows Media Log: A Guide to Film, Television, and Radio Programs Supported by the National Endowment for the Humanities, Division of Pu Great Radio Audience Participation Shows: Seventeen Programs from the 1940s and 1950s Radio Program Ideabook. Greater than the bomb : the first publication in English of a radio program broadcast internationally in 1950 and repeated many times since

Digital Radio Mondiale

From Wikipedia, the free encyclopedia.

Digital Radio Mondiale (DRM) is an international non-profit consortium committed to designing an open platform for digital radio broadcasting around the world, especially on shortwave.

The main advantage of such digital broadcasting is that it yields sound quality comparable to FM, but over short wave distances. As a digital medium, DRM can also transmit other digital data besides digitized music, including text, pictures and computer programs. DRM has been designed expecially to use older transmitters designed for audio AM, so major new investments are not required for early transmissions. The encoding and decoding can be performed with digital signal processing, so that small computers added to a conventional transmitter and receiver can perform the rather complex encoding and decoding.

The organisation has recently received approval for the AM standard from the IEC, and the ITU has approved its use in most of the world. (Approval for the Americas is pending amendments to other existing international agreements.) Its inaugural broadcast was held in 2003, on June 16^th in Geneva, Switzerland, at the ITU's annual World Radio Conference.

Unlike the PAC compression algorithm currently used by iBiquity's IBOC system in the United States, DRM's system uses MPEG-4 to code the audio. The resulting low-bitrate digital information is modulated using COFDM, similar to iBiquity's signal. Both systems can run in hybrid mode, with both analogue and digital, or in all-digital mode. iBiquity has been tested only on mediumwave AM with 10kHz channel spacing, however DRM has also been tested successfully on shortwave and longwave, and with 9kHz channel spacing as well.

External links

DRM in generel

• (pdf) DRM - progress on the receiver front
• A Listeners' Guide to Digital AM (DRM)
• DRM: Test Transmissions & Latest News Citat: "...It states that DRM is an ITU-R Recommendation for all the broadcasting bands spanning 150 kHz to 30 MHz...."
• hard-core-dx: DRM
• DRM - Digital Radio Mondiale - Digital AM radio below 30MHz
• DRM Product Purchases - Important Notes
• Digital Radio Mondiale (DRM)
• Kortbølge stationsdatabase kan downloades efter registrering (tager nogle dage): The World Top Shortwave Broadcasting Database Citat: "...This ILGRadio Database is now in use by more than 23 000 listeners, living in 139 countries all over the world !!!..."
• DIGITAL radio mondiale (DRM). A Worldwide initiative to bring AM radio into the digital era Citat: "...531 KHz from Multimedia anstalt Sachsen Anhalt, Burg near Magdeburg (stereo)..."

DRM radio techniques

• Welcome to the DRM™ Software Radio website
• DRM Receiver Modifications
• "bird-nest" DRM receiver

DRM radio techniques digital decoding

• Open-Source Software Implementation of a DRM-Receiver. Under the GNU General Public License (GPL)
• Dream is a software implementation of a Digital Radio Mondiale (DRM) receiver

DRM's COFDM

• Explaining some of the magic of COFDM, J H Stott (BBC) Citat: "...COFDM is particularly well matched to these applications, since it is very tolerant of the effects of multipath..."
• Coded Orthogonal Frequency Division Multiplexing (COFDM)
• All About OFDM from SSS Online and Pegasus Technologies
• OFDM, VOFDM, COFDM, Orthogonal Frequency Division Multiplexing: tutorials
• OFDM, VOFDM, COFDM, Orthogonal Frequency Division Multiplexing: resources
• COFDM/8-VSB Controversy Archive & Links

Index

• dmoz: Digital Broadcasting

Radios Golden Years: The Encyclopedia of Radio Programs, 1930-1960		A Thirty-Year History of Programs Carried on National Radio Networks in the United States, 1926-1956.		Radio Drama: A Comprehensive Chronicle of American Network Programs, 1932-1962		Radio Program Openings and Closings, 1931-1972
Radio Programs, 1924-1984: A Catalog of over 1800 Shows		Media Log: A Guide to Film, Television, and Radio Programs Supported by the National Endowment for the Humanities, Division of Pu		Great Radio Audience Participation Shows: Seventeen Programs from the 1940s and 1950s		Radio Program Ideabook.
Greater than the bomb : the first publication in English of a radio program broadcast internationally in 1950 and repeated many times since