vertical interval

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The area at the top of a television image that does not contain picture information. In PAL the first 25 lines of the screen represent the vertical interval. In the early days of television, these lines were needed to stabilize the picture. As the technology improved, the vertical interval was used by television engineers for various functions like carrying vertical interval timecode and closed caption information, and services such as teletext. Compare active picture.

Subjects: Media Studies.

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