On Sun, 18 Jun 2006 13:03:12 +0100, Glenn Richards
wrote:

Don Pearce wrote:

And just so that we are clear - noise doesn't figure in ground loops,
it is hum we are talking about.

Hum *is* a form of noise. It's an unwanted signal - and noise is any
unwanted signal.

We have three unwanteds in audio:

Hum - induced from the mains
Noise - internally generated random fluctuations
Distortion - signal-related products of nonlinear distortion

Go and learn the difference between them. Then find out why you have
to treat each differently, how they have different causes and of
course different remedies.

And of course none of these is signal, which is defined as the wanted
stuff.

d

--
Pearce Consulting
http://www.pearce.uk.com