Astra Digital Radio
<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.
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AST Computers, LLC
AST Research, Inc.
Asymmetric Digital Subscriber Line
Asymmetric Digital Subscriber Loop