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vertical blanking interval
(redirected from Vertical retrace)

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vertical blanking interval

Brief space between the drawing of television frames when no picture information is transmitted. The VBI may appear as black bars at the top and bottom of the screen on badly-adjusted TV sets. Several systems have exploited the VBI to broadcast data signals for other purposes. Examples include teletext pages (Ceefax, Teletext), subtitles for deaf viewers, and Intel's Intercast.



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The system includes vertical retrace synchronization to provide real-time feedback to control illumination and camera positioning.
In addition, an integrated flyback generator speeds up vertical retrace time.
 
 
 
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