What is vertical blanking interval?

Vertical Blanking Interval

The vertical blanking interval (VBI), also known as the vertical interval or VBLANK, is the time difference between the last line of one frame or field of a raster display, and the beginning of the first line of the next frame. It is present in analog television, VGA, DVI and other signals. During the VBI the incoming data stream is not displayed on the screen. In raster cathode ray tube displays, the beam is blanked to avoid displaying the retrace line; see raster scan for details. The signal source, such as a television broadcast, does not supply image information during the blanking period.

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Some articles on vertical blanking interval:

Rovi Corporation - Technology Details - Content Protection (RipGuard and Analog Copy Protection)
... Known as the vertical blanking interval (VBI), these extra lines are used to convey different things in different countries, like closed captioning ... On some TVs that do not properly blank the vertical retrace, dotted white lines additionally appear near the top of the picture ... CGMS-A consists of a "flag" within the vertical blanking interval (essentially data, like closed captioning) which digital recording devices search for ...
Blanking And Piercing
... Blanking and piercing are shearing processes in which a punch and die are used to modify webs ... are the same between the two, only the terminology is different in blanking the punched out piece is used and called a blank in piercing the punched out piece is scrap ...
Vertical Blanking Interval
... The vertical blanking interval (VBI), also known as the vertical interval or VBLANK, is the time difference between the last line of one frame or ... signal source, such as a television broadcast, does not supply image information during the blanking period ... right to left, called the horizontal retrace or horizontal blanking interval ...
NAPLPS - History
... Ceefax encoded character data into the lines in the vertical blanking interval of normal television signals where they could not be seen on-screen, and then used a buffer and decoder in the user's television to ... For instance, it could use the vertical blanking interval to send data to the user, and a modem to return selections to the servers ... codes were sent to users' televisions by encoding them as dot patterns in the vertical blanking interval of the video signal ...
Analogue Television Synchronization - Synchronization - Vertical Synchronization
... Vertical synchronization (Also vertical sync or VSYNC) separates the video fields ... In PAL and NTSC, the vertical sync pulse occurs within the vertical blanking interval ... The vertical sync pulses are made by prolonging the length of HSYNC pulses through almost the entire length of the scan line ...

Famous quotes containing the words interval and/or vertical:

    [I have] been in love with one princess or another almost all my life, and I hope I shall go on so, till I die, being firmly persuaded, that if ever I do a mean action, it must be in some interval betwixt one passion and another.
    Laurence Sterne (1713–1768)

    In bourgeois society, the French and the industrial revolution transformed the authorization of political space. The political revolution put an end to the formalized hierarchy of the ancien regimé.... Concurrently, the industrial revolution subverted the social hierarchy upon which the old political space was based. It transformed the experience of society from one of vertical hierarchy to one of horizontal class stratification.
    Donald M. Lowe, U.S. historian, educator. History of Bourgeois Perception, ch. 4, University of Chicago Press (1982)