Astra Digital Radio (ADR) is a system used by
SES Astra for
digital radio transmissions on their
Astra 1 satellites, using the audio subcarrier frequencies of analogue television channels. It was introduced in
1995. As of September 2007, there are still 56 stations that transmit in this format.The format uses one mono audio subcarrier, which would normally be allocated to an additional sound track or radio station, or half of a stereo sound track/station. The carrier is digitally modulated, and carries a 192 kbit/s, 48 kHz sampled
Musicam encoded signal. 9.6 kbit/s is available for data.Special receivers are required to listen to ADR stations, although some combined analogue/digital satellite boxes as well as later normal analogue boxes are equipped to decode it.
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Digital Radio over satellite, compatible with analog television transmissions. Alternatively the normal TV subcarriers can be modulated by a
MPEG-1 Layer-2 48 kHz 192 kbps signal. Quality is better than analog carriers and only needs half the
bandwidth (analog stereo = 2 carrier, digital stereo = 1 carrier). Quality is limited and the data rate can't be increased.
(2001-12-13)
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