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vertical blanking interval |
Also found in: Wikipedia, Hutchinson | 0.57 sec. |
vertical blanking intervalThe part of a TV signal that is sent between each video frame. In North American TV (NTSC), the vertical blanking interval (VBI) takes up the last 45 lines of each 525-line frame. Its purpose is to allow the TV time to reposition its electron beam from the bottom of the current frame (screen) to the top of the next one. This non-viewable part of the signal is used to transmit closed-caption content. See datacasting, V-chip and ATV Forum. |
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The term can be confusing, because TV is rated at 525 horizontal scan lines per frame, 483 of which are used for the picture (the rest are the vertical blanking interval). An earlier technology from Intel for broadcasting HTML content via the vertical blanking interval (VBI) of a TV signal. The term can be confusing, because TV is rated at 525 horizontal scan lines per frame, 483 of which are used for the picture (the rest are the vertical blanking interval). |
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