Date   : Wed, 03 Aug 2011 05:36:54
From   : robert@... (Rob)
Subject: [BeebSoc] Auntie, dear Auntie

On 3 August 2011 12:03, Adam Sampson <ats@...> wrote:
> Rick Murray <heyrick.beebsoc@...> writes:
> I've been wondering lately about the possibility of recovering Teletext
> data from old VHS recordings with some smarter signal processing -- for
> example, correcting for jitter by identifying bit boundaries, exploiting
> repetition of lines over time, and using statistical methods to help
> resolve ambiguous bits based on what they're likely to be. I suspect you
> could do an awful lot better than a conventional on-the-fly decoder is
> able to, and I like the idea of being able to construct a Teletext
> historical archive from random off-air recordings...

This IS being worked on - discussion on the Teletext-chat mailing
list.  Results look promising!

http://al.robotfuzz.com/~al/teletext/

Not perfect, but an order of magnitude better than has been achieved
before.  Jump in !!


Rob