craig@gpu.utcs.utoronto.ca (Craig Hubley) (08/17/90)
I would like to find some references for closed captioning technology
(the text streams that some TV shows provide that can be picked up and
displayed on captioning cable converters). I know this has been used
to let computers "watch TV" in the past, as in the Media Lab Personal
Newspaper project. I think Radius has a new video-in-a-window board
that can do this, too.
I would like to know:
- how the text stream is represented/encoded
(I assume it is done in the extra lines/redraw interval)
(there must be commands to 'clear screen' to display new text)
- how the text stream is decoded at the cable converter/terminal
(I assume it is encoded as characters and a ROM draws them)
- whether it is possible to monitor multiple channels at once
(perhaps by intercepting the cable prior to the converter)
- the level of standardization of the above
(North America wide? part of NTSC standard? world standard ?)
- what kind of software has been built on closed captions?
- how widespread is closed captioning ?
- sources of further information (email or postal contacts...)
Please mail, I will repost everything I receive.
Craig Hubley kid after Live Aid: "Is that it?"
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