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NABTS
NABTS, the ''North American Broadcast Teletext Specification'', is a protocol used for encoding NAPLPS-encoded teletext pages, as well as other types of digital data, within the vertical blanking interval (VBI) of an analog video signal. It is standardized under standard EIA-516, and has a rate of 15.6 kbit/s per line of video (with error correction).
==History==
NABTS was originally developed as a protocol by the Canadian Department of Communications, with their industry partner Norpak, for the Telidon system. Similar systems had been developed by the BBC in Europe for their Ceefax system, and were later standardized as the World System Teletext (WST, aka CCIR Teletext System B), but differences in European and North American television standards and the greater flexibility of the Telidon standard led to the creation of a new delivery mechanism that was tuned for speed.
NABTS was the standard used for both CBS's ExtraVision and NBC's very short-lived NBC Teletext services in the mid-1980s. Due to teletext in general not really catching on in North America, NABTS saw a new use for the datacasting features of WebTV for Windows, under Windows 98, as well as for the now-defunct Intercast system. NABTS is still used for private closed-circuit data delivery over a television broadcast or video signal, and Canadian company Norpak still sells and manufactures encoders and decoders for NABTS.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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