10 Facts About Teletext

Teletext, or broadcast teletext, is a standard for displaying text and rudimentary graphics on suitably equipped television sets.

Teletext sends data in the broadcast signal, hidden in the invisible vertical blanking interval area at the top and bottom of the screen.

Teletext was created in the United Kingdom in the early 1970s by John Adams, Philips' lead designer for video display units.

Teletext formed the basis for the World System Teletext standard, an extended version of the original system.

Teletext is a means of sending text and simple geometric shapes to a properly equipped television screen by use of one of the "vertical blanking interval" lines that together form the dark band dividing pictures horizontally on the television screen.

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Teletext's configuration contained all the fundamental elements of classic teletext including pages of 24 rows with 40 characters each, page selection, sub-pages of information and vertical blanking interval data transmission.

In North America NABTS, the North American Broadcast Teletext Specification, was developed to encoding NAPLPS teletext pages, as well as other types of digital data.

Teletext information is broadcast in the vertical blanking interval between image frames in a broadcast television signal, in numbered "pages".

Teletext is used for carrying special packets interpreted by TVs and video recorders, containing information about subjects such as channels and programming.

Teletext allows up to eight 'magazines' to be broadcast, identified by the first digit of the three-digit page number .