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ETP-1 (or Electronic Test Pattern One) was … ETP-1 (or Electronic Test Pattern One) was a test card designed and used by the Independent Broadcasting Authority (IBA). After test transmissions from the IBA's Engineering Regional Operations Centre (ROC) in Croydon from 1978 it was phased in on ITV over a period starting from 1979, replacing, in different ITV regions: Test Card F, Test Card G and full screen height EBU colour bars. After ITV went 24 hours in 1988, the card ceased to be seen on the channel. It was used for both 625-line PAL and 405-line monochrome broadcasts. It was also seen extensively on both Channel 4 and S4C during both their pre-launch tests and their downtime of those channels, due to their limited hours early on. After launch, it was alternated with in-vision teletext services from ORACLE and 4-Tel on View/Sbectel. On these channels, it was captioned either IBA:CH4 or IBA:S4C, with lines above and below this indicating the card was being generated by the channel, the absence of these lines meant it was generated at the transmitter. After the splitting up of the IBA in 1990, the captioning was changed to NTL:CH4/NTL:S4C. ETP-1 was last broadcast on 31 December 1992 after which Channel 4 showed 4-Tel on View during closedown periods as the channel gradually increased its late night programming, eventually going 24 hours a day early in 1997. After the conclusion of its late-night teleshopping block, S4C shows a closedown slide promoting its S4C Clic VOD service with library music playing in the background during off-air hours. On 18 April 2012, ETP-1 made one final appearance on Channel 4 to announce the loss of analogue television services in the London region. The card was shown from the Crystal Palace transmitter only, and was the last thing broadcast by analogue Channel 4 before the signal was switched off.nnel 4 before the signal was switched off.
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| rdfs:comment |
ETP-1 (or Electronic Test Pattern One) was … ETP-1 (or Electronic Test Pattern One) was a test card designed and used by the Independent Broadcasting Authority (IBA). After test transmissions from the IBA's Engineering Regional Operations Centre (ROC) in Croydon from 1978 it was phased in on ITV over a period starting from 1979, replacing, in different ITV regions: Test Card F, Test Card G and full screen height EBU colour bars. After ITV went 24 hours in 1988, the card ceased to be seen on the channel. It was used for both 625-line PAL and 405-line monochrome broadcasts.ne PAL and 405-line monochrome broadcasts.
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ETP-1
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