THE WHATIS.COM WORD-OF-THE-DAY November 20, 2002 closed captions ______________ TODAY'S SPONSOR: NetIQ WebTrends
Free White Paper: The Executive Pocket Guide to Smarter Marketing Myth: The Web will never be a significant piece of the media mix. Fact: Your Web site is already a critical part of the blend. Break down the myths and get smarter about how the Web changes the marketing principles you already know. You can't afford to lose on the Web. So get your free copy of "Winning on the Web: The Executive Pocket Guide to Smarter Marketing" from NetIQ WebTrends today! http://WhatIs.com/r/0,,7669,00.htm?freewhitepaper ______________ TODAY'S WORD: closed captions See our definition with hyperlinks at http://whatis.techtarget.com/definition/0,,sid9_gci864467,00.html Closed captions are a text version of the spoken part of a television, movie, or computer presentation. Closed captioning was developed to aid hearing-impaired people, but it's useful for a variety of situations. For example, captions can be read when audio can't be heard, either because of a noisy environment, such as an airport, or because of an environment that must be kept quiet, such as a hospital. People learning a language, or simply learning to read can also benefit from closed captioning. Closed captioning information is encoded within the video signal, in line 21 of the vertical blanking interval (VBI). The text only becomes visible with the use of a decoder, which may be built into a television set or available as a set-top box. In general, an onscreen menu on newer televisions (it may be labeled "SAP" selection) allows you to turn closed captioning on or off. Open captions, in contrast, are an integral part of a transmission that cannot be turned off by the viewer. Most programs are captioned in advance of transmission, but the nature of some programs, such as live news broadcasts, requires real time captioning. For real time captioning, a stenographer listens to the broadcast and types a shorthand version into a program that converts the shorthand into captions and adds that data to the television signal. According to the Television Decoder Circuitry Act of 1990, all televisions made in the United States since 1993 must have a built-in caption decoder if their picture tubes are larger than 13 inches. In July 2000, the Federal Communications Commission (FCC) mandated sections of industry standard EIA-708-B, "Digital Television (DTV) Closed Captioning" into its broadcast regulations. The new rules will make it possible for users to select the size, color, and font of their captions and to select among multiple streams, choosing, for example, a particular language. RELATED TERMS: vertical blanking interval http://whatis.techtarget.com/definition/0,,sid9_gci213677,00.html set-top box http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci212971,00.html DTV http://whatis.techtarget.com/definition/0,,sid9_gci339456,00.html ______________________ SELECTED LINKS Gary Robson's Closed Captioning FAQ provides an overview. http://www.robson.org/capfaq/overview.html How Stuff Works explains how closed captioning works. http://www.howstuffworks.com/question427.htm In the U.S., WGBH summarizes the FCC's rules for what programming must provide closed captioning. http://main.wgbh.org/wgbh/pages/mag/resources/guides/mag_guide_vol3.html ______________________ QUIZ #32 | Securing Your Network How much do you know about network security? Take our latest quiz and find out. >> Take the quiz http://searchsecurity.techtarget.com/sDefinition/0,,sid14_gci857673,00.html ______________________ CROSSWORD PUZZLE #6 | Wireless Improve your flexible thinking skills. 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