Later Developments
While the basic teletext format has remained unchanged in more than 30 years, a number of improvements and additions have been made.
- Standard Electronic Programme Guides (EPG), like NexTView, are based on teletext, using a compact binary format instead of preformatted text pages.
- Various other kinds of information are sent over the teletext protocol. For instance, Programme Delivery Control signals—used by video recorders for starting/stopping recording at the correct time even during changes in programming—are sent as teletext packets. A similar, but different, standard Video Programming System is also used for this purpose.
- Teletext pages may contain special packages allowing VCRs to interpret their contents. This is used in relation to the Video Programming by Teletext (also known as startext) system which allows users to program their videos for recording by simply selecting the program on a teletext page with a listing of programs.
- Other standards define how special teletext packets may contain information about the name of the channel and the program currently being shown.
Read more about this topic: Teletext
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