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Use of the Philips circle pattern was in its test card broadcasts until 17 February 2001 between 12:00 AM and 06:00 AM (the next day, bTV started 24-hour transmissions), and 2 times a year during transmitter maintenance until 2013. The Philips circle pattern was also used in Hungary, [161] Belgium, [162] [163] Norway, [164] [165] and Sweden. [166]
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The content and layout of the pattern, as well as the generator, was designed and made by Danish engineer Finn Hendil (1939–2011) at the Philips TV & Test Equipment laboratory in Amager, south of Copenhagen in 1965–66. [4] It has been used in Australia, Spain, United Arab Emirates, [5] Denmark, [6] Israel, [7] Qatar, and the Netherlands.
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.
As Televisión Española adopted the PAL colour system in 1975, [4] [5] the test card has specific elements that allow proper colour adjustments. Being a creation of the same team behind the Philips PM5544 test card, [8] [9] it has many elements in common with it (like colour and grey bars or castellations [10]), but introduces some differences (for example, different resolution gratings and ...
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Low Frequency Response: letterbox above the circle; Reflections: black and white areas to the sides of the circle; Focus: diagonal black and white stripes; Picture into sync: triggered by the castellations; The card was available as individual rolls of test film in the UK and many Commonwealth countries up until the end of the black-and-white ...