An acronym for Vertical Blanking Interval, which is composed of the first 21 horizontal lines in each NTSC field. These lines are not intended to be directly displayed by a receiver. In digital systems, the VBI does not exist.
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The Advanced Television Systems Committee, Inc., is an international, non-profit organization developing voluntary standards and recommended practices for digital terrestrial broadcasting. ATSC member organizations represent the broadcast, broadcast equipment, motion picture, consumer electronics, computer, cable, satellite, and semiconductor industries. ATSC also develops digital terrestrial broadcasting implementation strategies and supports educational activities on ATSC standards.