astra digital radio

from The Free On-line Dictionary of Computing (8 July 2008)

Astra Digital Radio
ADR

   <audio> {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)