RobH in uk.rec.audio:


I don't think this is quite correct even for the most basic pulses. If
you examine a "digital signal" at a high resolution you will see
"ringing" occur when the voltage changes so the signal isn't either 0v
or 5v but an approximation of a square wave such as

http://mathworld.wolfram.com/Fourier...quareWave.html

The signal becomes "digital" because the resolution of the receiving
equipment is set such that the subtle variation per cycle is not
detectable or is ignored.

True. There is no perfect 'digital wave'. However, for the reciving end,
the voltage isn't sampled at transitions between bits, meaning it should
(in theory) only see the logical extremes and not the ringing.

Either way, beacuse a digital signal shares some analogue properties
doesn't mean it has to be treated with analogue care. At least for the tiny
bandwidth hifi needs.

--
Jim H