TV Test Pattern
The advent of 24/7 and on-demand television programming has made images such as this rare and rather quaint. Learn about the rise and fall of the TV test pattern. Read on!
A test pattern, also known as a test card, 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 patterns were originally physical cards at whic…
