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vertical blanking interval |
Also found in: Acronyms, Wikipedia, Hutchinson | 0.01 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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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But unlike PC cable modems, which compete with conventional video programming for the cable system's carrying capacity, Worldgate's approach would employ a largely unused portion of the video spectrum called the vertical blanking interval. By listening to the needs of their customers, Fortel has also developed unique features seen nowhere else in the industry, such as both analog and digital inputs and outputs on a single module, dual path processing(TM) - which provides separate channels for both composite video and decoded video synchronization - and fully programmable independent line-by-line processing in the vertical blanking interval (VBI). Gemstar-TV Guide will support G-GUIDE Gold by broadcasting its data ("Gemstar Data") in both the vertical blanking interval of the television signals of the Tokyo Broadcast System (TBS) broadcast network, one of Japan's top four national broadcast networks, and on Megaport, a leading provider of digital data services. |
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