1970
Digital Line-Store Standards Convertor work commences
1971
World's first demonstration of Digital Recording of Stereo Audio Signals
1972
Quadraphonic (Four-Channel Sound) Recordings
Made at the 50th Anniversary Promenade Concert in the Royal Albert Hall, experimental broadcasts happened in 1977.
1974
CEEFAX launches on 23rd September 1974
CEEFAX is the ±«Óãtv version of Teletext, this service ran for 48 years until Digital Switchover in 2012.
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±«Óãtv R&D demonstrates world's first Digital Television Recorder
At IBC (The International Broadcasting Convention).
Queen's Award for Sound-in-Syncs
This was awarded jointly with the ±«Óãtv Designs Department.
1975
Successful transmission of Digital Television signals
Over 120 Mbit/s Post Office link between Guildford and Portsmouth.
1976
First transmissions of Digital Television over INTELSAT satellite
This was at 60 Mbit/s. INTELSAT stands for International Telecommunications Satellite Organization.
1977
World first Multi-Channel Digital Audio Recorder to be made commercially available in 1979
This was publicly announced in November 1977 and was jointly developed by the ±«Óãtv and American company 3M. It was the first of its kind.
1978
Demonstrations of VHF Radio Data (RDS) on Tomorrow's World
The system was publicly launched in 1987.
1979
First CEEFAX Teletext subtitled programme
This will be a milestone in the history of television. For the first time anywhere in the world, a programme will be transmitted to two sets of viewers at the same time. For most viewers it will be seen as a normal programme. but for deaf viewers with Ceefax sets it will be seen with a visual commentary. There will be sub-titles but, for the first time ever, only for Ceefax viewers who want them.
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