The availability of closed-captioning technology has been around since the 1970s to television producers and to members of the ordinary who chose to purchase decoders. The decoding devises sold for between 160 dollars and cc dollars each; they are now obsolete. The closed-caption system works line 21 of the vertical-blanking interval. This is part of the television argue which is sent precisely registers as a blank line between frames of the picture. When the vertical take up on a television touch on is not set correctly, the picture flips. In between each of the pictures is a swarthy line. This dark line is actually 20-odd spare lines in the signal (Closed-captioning 93). Video recorders are able to store text with the American line 21 system.
Other systems use different methods to close-caption programs. Teletext is one of these other methods. It uses a scaled down version of an unfluctuating page of general teletext dish out. Teletext is able to provide lots of colors, pages, and fonts, but it takes several lines of the vertical-blanking interval to transmit. The main draw keister of teletext is that it cannot be stored on videos (Closed-captioning 93).
earlier to the legal mandate to include the decoder chip for closed-captioning in telev
Closed-captioning of television was originally mean to benefit the 24 million Americans who are hearing impaired. saucy uses for the technology are still being developed. Closed-captioning promises to include more(prenominal) people in the audience for television entertainment. Information will be transmitted by television set rather of strictly through printed material. This will open new horizons for indifferent(p) and hearing impaired individuals including them in the larger American ending instead of isolating and insulating them in their own deaf culture.
ision sets, at that place were only 300,000 televisions fitted with decoder boxes. This number was not enough to service the deaf and hearing disabled population of 24 million Americans (Closed Caption Requirement 2215).
The decoder boxes were difficult to install and more hearing impaired individuals were embarrassed to purchase or use them because of the stigma surrounding a hearing loss (Closed Caption Requirement 2215). The decoder chips, which are now required to be built into the television sets, cost between 3 dollars and 15 dollars apiece (Closed-Captioning Access 3215). This increase in the cost of manufacturing a television set is passed on to the consumer in the form of an increase price tag. The additional cost allows viewers to flip a switch on their remote control or the back of the set and have closed-captioned television when it has been captioned by the producers.
Milone, Michael N. "Closed-Caption TV: A New Tool For Reading and ESOL." Technology & breeding 14 (September 1993): 22-23.
Close-captioning of commercials is proceeding at the rate of 2500 to 3000 commercials a year (Elliott D16). By 1993, there were over 400 hours of television a week which were close-captioned (Milone 22). In addition, there are over 3000 videos already close-captioned available for sale or rent. The National Captioning Institute is able to convert the British line 22 captioning system to the American line 21 st
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