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test pattern

noun, Television.
1.
a geometric design broadcast to receivers for testing the quality of transmission, often identifying the transmitting station and channel.
Origin
1945-1950
1945-50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for test pattern

test card

noun
1.
a complex pattern used to test the characteristics of a television transmission system
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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4
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