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DRM listing in Wikapedia needs more updating...

http://en.wikipedia.org/wiki/Digital_Radio_Mondiale
French / German / Spanish versions non existant...
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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 shortwave 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 especially 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 (ITU region 2) is pending amendments to other existing
international agreements. The inaugural broadcast took place on June 16,
2003, in Geneva, Switzerland, at the ITU's annual World Radio Conference.

DRM's system uses MPEG-4 to code the audio: AAC for music and CELP or HVXC
for speech programs. All codecs can optionally be combined with SBR. The
resulting low-bitrate digital information is modulated using COFDM. It can
run in simulcast mode by switching between DRM and AM, and it is also
prepared for linking to other alternatives (e.g. DAB or FM services). DRM
has been tested successfully on shortwave, mediumwave (with 9 as well as 10
kHz channel spacing) and longwave.