Garrett Wollman wollman@csail.mit.edu
Mon Dec 5 09:01:46 EST 2005

<<On Mon, 05 Dec 2005 08:30:55 -0500, Brian Vita <brian_vita@cssinc.com> said:

> The JPEG pixelation is usually an indication of a degraded signal.  
> Either you cable is flakey or the satellite feed is weak.

Actually, it's MPEG, not JPEG, in this case.  (Although the inderlying
principle -- the Discrete Cosine Transform -- is the same in both JPEG
images and MPEG C-frames.)

In any event, it's also an indication of an over-compressed signal, as
when certain public broadcasters try to run PBS HD and a full slate of
multicast feeds on the same multiplex.


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