VBI (Vertical Blanking Interval)

Portion of a normal video signal located between successive fields or frames that carries no image information (i.e., it is blank). In traditional CRT-based displays, this time interval was required to allow the electron gun to reposition from the bottom of the display to the top. Although some modern forms of display do not require this blanking time, the VBI is part of universal video standards. Ancillary data, such as audio signals, time codes, and test signals, is often inserted into the VBI portions of video signals.