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Originally Posted by Womble
Thus leading me to believe they have a better bitrate or compression method
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According to other posters (Tristan, I think), for most channels, NTL just send out exactly the same signal that's output from Sky or Freeview (no recompression). For Sky One, and the Sky sports channels, they recieve an uncompressed signal, which they compress at a higher bitrate than Sky do.
So, in theory, the picture on those channels should be better on NTL than Sky. In practice, it depends on a lot of things, such as quality of decoding circuitry (play a DVD on a cheapy DVD player, then a top of the range one for a demo of that), quality of display device, cabling etc.
As for compression method, well, all Digital broadcasting in this country uses MPEG 2.