Where in those tracks should i hear ringing?
:12 and :17 in 1st
Personally I've noticed every single night on Letterman. But only when the audience gets loud.Have also have heard during football games when the crowd gets very loud. And things like the Emmys.
Same sound, right? http://www.youtube.com/watch?v=JCWEzfbPlfkI'm with mixminus1, two things come into my mind: electromagnetic interference prior to encoding/broadcasting (likely), or problem with the encoder hardware (unlikely, I've heard artifacts like this before due to faulty memory, but they were much more noticeable). Edit: hmm, in all three videos it occurs periodically... on a 5-second grid...Chris