ASTRA Digital Radio (ADR) is a satellite audio transmission system using QPSK modulated subcarriers. For source coding the internationally standardized MPEG-1 Layer II digital audio compression has been selected. ADR has been designed to provide a maximum operational flexibility for both the broadcasters and the satellite operator. For the consumer the ADR system allows for a very high number of near CD-quality radio programmes which may be received with a low cost receiver connected to a standard 60cm ASTRA reception dish. ASTRA Digital Radio will be used by public and private radio stations and also to provide a subscription-based digital pay audio service. The system will be officially launched in August 1995 with over 100 audio programmes.
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