First post, by Donovan V.
So, I recently noticed -allright, I had noticed a long time ago but wasnt curious enough to ask - that some TV transmissions have what I can only distinguish as some data blocks on top of them. they are mostly visible when the horizontal sync is lost and the picture scrolls. So my question is... can anyone tell me what they are, if they are a standard and you know... give me an introduction to them? Thanks.