Date   : Fri, 17 Jul 2009 23:01:16 +0100
From   : jgh@... (Jonathan Graham Harston)
Subject: Fw: Fwd: ITV Teletext to shut down in January

"Anders Carlsson" wrote:
>  If the teletext service really is *completely* dumped, I wonder why. Are
> they saving as much bandwidth as possible for digital HDTV broadcasts?
> Generate a 40x24 text display and attach digitally to the picture can't rely
> on obsolete equipment, it must be doable even with a modern computer.
 
Even if you're just tranmitting the 12 scan-lines that contain
teletext data, you can't just not transmit the other 613 lines.
Even if you could somehow set up a system that only transmitted 12
scanlines each second, that would occupy the whole of a UHF TV
transmission slot for 0.0192s each second.
 
-- 
J.G.Harston - jgh@...                - mdfs.net/User/JGH
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