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"BROADCAST CLOSED CAPTIONING Closed captioning can be extremely helpful in at least three different situations: It has been a great boon to hearing-impaired television viewers. It can also be helpful in noisy environments. For example, a TV in a noisy airport terminal can display closed captioning and still be usable Some people use captions to learn English or learn to read. For one good video on this, see: http://www.youtube.com/watch?v=OROk7fkY-OE&cc_load_policy=1 Closed captioning is embedded in the television signal and becomes visible when you use a special decoder, either as a separate appliance or built into a television set. The decoder lets viewers see captions, usually at the bottom of the screen, that will tell them what is being said or heard on their favorite TV shows. Since 1993, television sets with screens of 13 inches or more that are sold in the United States must have built-in decoders, under the Television Decoder Circuitry Act. Set-top decoders are available, too, for older TV sets. (...)"