Definition of test pattern in English:

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test pattern

Entry from US English dictionary

noun

A geometric design broadcast by a television station so that viewers can adjust the quality of their reception.
Example sentences
  • Mr. Benson and Meg sat mesmerized by the test pattern on the television.
  • A couple of those shows would have failed even if they'd only been opposite a test pattern.
  • An announcer uses the ‘remote carrier beam,’ another TV monitor with a test pattern, to bring the captain's ‘special agents into sharp focus.’

For editors and proofreaders

Syllabification: test pat·tern

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