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Like other television programming, sign-on and sign-off sequences can be initiated by a broadcast automation system, and automatic transmission systems can turn the carrier signal and transmitter on/off by remote control. [a] Sign-on and sign-off sequences have become less common due to the increasing prevalence of 24/7 broadcasting.
The Indian head was also used by the Canadian Broadcasting Corporation (CBC) [15] in Canada in conjunction with its own monochrome test pattern, [16] following the Canadian national anthem sign-off in the evening, and during its final years in the late-1970s and early-1980s it was shown before sign-on in the morning, after the showing of the ...
Test cards typically contain a set of patterns to enable television cameras and receivers to be adjusted to show the picture correctly (see SMPTE color bars).Most modern test cards include a set of calibrated color bars which will produce a characteristic pattern of "dot landings" on a vectorscope, allowing chroma and tint to be precisely adjusted between generations of videotape or network feeds.
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Until the end of the 1990s (for example BBC One by November 1997 [1]) most TV stations around the world would sign-off between around midnight and 3am local time, and showed a test card until the sign-on in the morning. Most often at the main public stations (like BBC1 in Britain) showed the national anthem before closing down.
The digital television transition, also called the digital switchover (DSO), the analogue switch/sign-off (ASO), the digital migration, or the analogue shutdown, is the process in which older analogue television broadcasting technology is converted to and replaced by digital television.
However, Music Box shut down at the start of 1987 and YTV went back to a nightly closedown although it did air a Teletext information service called Jobfinder for an hour after sign-off. In August 1987, Thames/LWT and Anglia began through-the-night broadcasting (Thames had already extended broadcast hours to around 4 am earlier in
As of 1990, Soviet Central Television (Programme One, Programme Two and Moscow Programme) signed off at about 02:00 with the station ident, Clock ident, caption Do not forget to turn off the TV. Also, there was a sign off in the noon, beginning around in 1 pm and by 2:30 to 4 pm there was the second daily sign on with various news and ...