"GregS"
Fo the system used in the USA see:
http://en.wikipedia.org/wiki/8VSB
** AFAIK it looks very much like noise.
..... Phil
I see that on the other posters response link.
I was listening on my detector last week and didn't pic up anything
audible. Will check it again with a simple spectrum analyzer later.
With analog, I heard the video as it was being detected with the input of a simple
op-amp amplifier. Basically sounding like when you plugged the video
into an audio input by mistake.
Interference, mostly in the audible band has been the main cause
for concern from a nearby tower about 500 feet away, with the old analog. They just started
broadcasting digital last week and I am checking for common noise
problems detected with sensitive lab equipment.
Construction in new buildings specified aluminum backed drywall because
of this tower.
greg