Re: Class/type of amp ?

I"William Sommerwerck" <grizzledgeezer@xxxxxxxxxxx> wrote in
news:gig2ai$l71$1@xxxxxxxxxxxxxxxxxxx:

Ah! Here's the problem. It's the confusion between /waveform/ and
/data/.

A pulse is just a pulse. In and of itself it means nothing. It is
neither "digital" nor "analog" -- it's just a waveform.

The issue here is how we modify a waveform to transmit data.

Suppose we sampled a signal at or above the Nyquist rate and transmitted
each sampled value as a pulse of that value. (This is easily done with a
sample-and-hold circuit.)

How is the /data/ in that series of pulses represented? Well, it varies
/continuously/, just as the original signal did. It has not been
quantized, so it cannot be represented as one of a /finite/ group of
numbers. That's analog -- continuous variation.

On the other hand, if we quantized the level of the sample data, it
would now be in digital form.


In general, your argument is correct and Arfa is mistook.

However one quibble: simply chopping the time stream up into integral
slices and restricting the level (or width [or frequency {or phase}]) of
an output signal to specific levels does not "really" 'digitize' the data.
Doing an analogue to digital conversion and transmitting the data in the
form of a stream of digitized information (as opposed to one out of 1024
possible levels, for example) is essential in order for the information to
be 'digital' [in my mind].

Although restricting the data to particular levels might be a quantum leap
forward in efficiency, it doesn't really make the processing of the data
'digital' {although one could argue that it HAS been digitized into 'BASE
1024', I think that is really cheating}.

In any case, it has been an interesting discussion to follow. Thank you
BOTH.







--
bz 73 de N5BZ k

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.

bz+ser@xxxxxxxxxxxxxxxxxxxx remove ch100-5 to avoid spam trap
.

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