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 which a television camera was pointed, allowing for simple adjustments of picture quality. Such cards are still often used for calibration, alignment and matching of cameras and camcorders.
Electronically generated test patterns, used for calibrating or troubleshooting the downstream signal path, were introduced in the late 1960s. Test signal generators, which do not depend on the correct configuration (and presence) of a camera, and can also test for additional parameters such as correct colour decoding, sync, frames per second and frequency response.
The famous RCA (Radio Corporation of America) test pattern, incorporating the head of a Native American chief, was used mainly in North America from 1940 to the 1970s … for black and white analog TV receivers. An experienced broadcast engineer could glance at the drawing of the Indian Chief and quickly know if everything was OK, or if more careful adjustment was needed.
In the United States, test patterns were also used to test the Emergency Broadcast System (EBS), which was designed to alert the public to emergencies. If a test pattern interrupted regular programming accompanied by a loud alert tone, it was part of this system.
The Philips test pattern is widely recognised as one of the iconic popular culture symbols of the 1980s and 1990s, and that is the pattern that was modified to become a REMO TV design in 1994 – and happily we continue to receive orders for T Shirts bearing that iconic image. Browse that range HERE.
Formerly a common sight, test patterns are now only rarely seen outside of television studios, post-production and distribution facilities. In particular, they are no longer intended to assist viewers in the calibration of television sets.
Despite this, test patterns hold a special place in the hearts of many people who grew up with early television. They have become cultural symbols of a bygone era.
And still quite beautiful.
Story Idea: Bonnie Siegler
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