🚀 go-pugleaf

>In <1992Sep03.042045.5095@ecst.csuchico.edu> rmintz@ecst.csuchico.edu (Rich Mintz) writes:
>
[.....]
>know where) and most importantly the little funny square. On our commerical
>stations two queue markers are sent at the right hand edge of the screen in
>the top 20 or so lines, these look to be some sort of tone which masks the
>signal underneath. The tv companies use these to que in local adverts in
>networked programmes. I think the first marker appears 30seconds before the
>adverts. So you could build a box to look for this and once its found it
>wait 30secs and kill the audio. However I dont know if this is present
>in US systems.
>
>Raggy
>

A similar system, that would work if the conditions are right is to
take advantage of the fact that most places in the UK can receive
two ITV regions (how true is this?), especially with a second aerial
(I'm fortunate that I can get both Granada and Central with one group
C/D aerial pointed at Winter Hill even though the Central transmitter
(Sutton Coldfield?) is group A in totally the opposite direction.

Anyway, usually both regions transmit the same peak time programs,
but opt out for local adverts. Therefore, all you need to do is detect
when the sound and/or video from the regions is significantly different.

Remember, your picture from the second transmitter needn't be perfect,
just good enough for your image processing / signal processing to
tell the difference.

This is just an idea, I haven't tried it.

Cheers
Mark
mark-r@spec0.ee.man.ac.uk