[sci.electronics] Closed-captioning to ASCII?

dcj@sun.UUCP (09/27/87)

How is 'closed-captioning' transmitted in the video signal?

Are there any devices that can read closed-captioned text
and output ASCII?

I didn't think this was easy, but I recently read the following
in "The Media Lab, Inventing the Future at MIT", by Stewart Brand:

  "The Lab already has a working program called NewsPrint that every
   night prints out the closed-captioned text of the 'ABC Evening News'
   along with images it's taken off the air for illustration."

Any information or pointers to information about this will be
appreciated.

Don Jackson
dcj@sun.com