Diferencias Entre Open And Close Caption

What is the difference between open and closed captioning?
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Video has played an important role in education for many decades. Now, in the form of computer-based multimedia, videois increasingly utilized in distance learning and other web-based educational applications. However, the audio portion of a video presentation is inaccessible to people who are deaf or hard of hearingunless it includes captions. Captions are on-screen text descriptions that display a video product's dialogue, identify speakers, and describe other relevant sounds that are otherwise inaccessible topeople who are deaf or hard of hearing. Captions are synchronized with the video image so that viewers have equivalent access to the content that is originally presented in sound, regardless ofwhether they receive that content via audio or text. Captions are either open or closed. Open captions always are in view and cannot be turned off, whereas closed captions can be turned on and off by theviewer.
For video that is displayed on television sets, special devices called decoders must be available in order to view closed captions. Since 1993, decoders have been required to be built intotelevision sets 13 inches or larger sold for use in the United States.
When videos are accessed on the World Wide Web, they also may have captions that are open or closed. Closed captions appear onlywhen the user agent (e.g., a media viewer player) supports them. At least one version of most major media viewer software applications now supports closed captions. Some of these products may supportcaptions in their stand-alone client versions but not in browser-embedded or handheld versions of their products.
Delivering video products with closed captions places responsibility on the user tounderstand how to turn captions on, either on their television sets or in their media viewer software. So that the user isn't faced with this burden, some people argue in favor of delivering video...