[Floyd L. Davidson]

(Don Pearce) wrote:
Sorry, but that is simply nonsense. A signal that is sampled in time,
but not quantized is an analogue signal. It is treated and processed
by analogue circuits. For a signal to be digital its sampled levels
must be represented by numbers, which are processed mathematically by
some sort of microprocessor.

That is, it must actually be quantized.

Perhaps that is what you meant to say earlier, but you
actually didn't, and said that the quantized signal has
to be represented by numbers, which it is by definition.

The signal can be reconverted to an
analogue one later by a D to A.

It's best to call that a quasi-analog signal...

The output of a D to A is still a
time-sampled signal, but since it is now a set of varying levels, we
again call it an analogue signal.

--
Floyd L. Davidson http://www.apaflo.com/floyd_davidson
Ukpeagvik (Barrow, Alaska)