A test card, also known as a test pattern or start-up/closedown test, is a television test signal, typically broadcast at times when the transmitter is active but no program is being broadcast (often at sign-on and sign-off). Used since the earliest TV broadcasts, test cards were originally physical ... 1 Technical details; 2 History; 3 Monoscope; 4 Test patterns for photocopiers ...
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Test Cards were designed to calibrate the fidelity of an image at both the television camera and receiver ends of the transmission process. Appearing first as a ...
Apr 22, 2012 ... Film · Books · Music · Art & design · TV & radio · Stage · Classical · Games ... In the mid-70s, there were only three TV channels and very few programmes during the day. ... had more screen time – around 70,000 hours – than anyone else in British TV history. ... But it was the testcard music that hooked me.