[Don Pearce]

On Sun, 19 Aug 2007 23:26:16 -0700, (Dave Platt)
wrote:

"Digital" and "subject to aliasing" are two different things.

As I believe the term "digital" is usually meant, it implies a
two-state (on/off) storage representation. It's not just that the
signal amplitude is quantized, but that the quantization uses a
power-of-two representation and storage system of some sort.

My reading of the possible systems goes like this.

analogue - a continuous representation of the original signal
sampled - a representation of the signal at discrete time points
quantized - a sampled signal, but with the possible levels constrained
to a limited set of values
digital - a quantized signal, with the individual levels represented
by numbers

Aliasing is going to happen as soon as you move beyond the first line
of that list.

d

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