EIA-608 defines four channels of caption information, so that a program could, for example have captions in four different languages. There are two channels, called 1 and 2 by the standard, in each of the two fields of a frame. However, the channels are often presented to users numbered simply as CC1-2 for the odd field and CC3-4 for the even field. However the first channel contains the captions related to the audio track and the second is any extra detail that is not in the audio track, such as visual descriptions or provider accreditation. So technically both could be displayed together however given most captions are generated from scripts and caption were designed primarily for the hearing impaired there has been little use for the second channel.
Within each channel, there are two streams of information which might be considered subchannels: one carries "captions" and the other "text." The latter is not in common use due to the lack of hardware support and bandwidth available. Text is signaled by the use of text commands and is used for a formatted URL string with a 16-bit checksum that is a web site that the captions relate to.
Read more about this topic: EIA-608
Other articles related to "channels, channel":
... one in British Columbia as well as two cable-only channels, one in Alberta and the other in Atlantic Canada Bell Media Television also owns 30 cable television ... companies which operate similar channels, and primarily concentrated in the following genres Genre Key channels Foreign partner Sports TSN, RDS, TSN2 ...
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... Channels are the "chat rooms" on said networks ... IRC channel operators (commonly referred to as chops or chanops) are the individuals who run any given channel ... and across those networks there are usually large numbers of IRC channels, there are some unifying features common to the social structures of them all ...
... are Public-access television or Community television channels in other countries, notably in Scandinavia, Western Europe, Canada and Australia ... In Germany, Norway and Sweden there are "Open channels" ... In most countries Public-access television channels are broadcast on cable but in Australia, Denmark and Norway Terrestrial television transmission is common (UHF or digital) ...
... Channels that mostly target the Nordic countries ... Most channels carry subtitles and/or audio in Swedish ...
Famous quotes containing the word channels:
“As every pool reflects the image of the sun, so every thought and thing restores us an image and creature of the supreme Good. The universe is perforated by a million channels for his activity. All things mount and mount.”
—Ralph Waldo Emerson (18031882)
“It is worth the while to detect new faculties in man,he is so much the more divine; and anything that fairly excites our admiration expands us. The Indian, who can find his way so wonderfully in the woods, possesses an intelligence which the white man does not,and it increases my own capacity, as well as faith, to observe it. I rejoice to find that intelligence flows in other channels than I knew. It redeems for me portions of what seemed brutish before.”
—Henry David Thoreau (18171862)
“Not too many years ago, a childs experience was limited by how far he or she could ride a bicycle or by the physical boundaries that parents set. Today ... the real boundaries of a childs life are set more by the number of available cable channels and videotapes, by the simulated reality of videogames, by the number of megabytes of memory in the home computer. Now kids can go anywhere, as long as they stay inside the electronic bubble.”
—Richard Louv (20th century)