"Floyd L. Davidson" wrote:
Ron Capik wrote:
"Floyd L. Davidson" wrote:
Distortion can *always* be counteracted by the introduction of
an "error signal" which is opposite to the distortion.
Therefore it would seem that distortion is necessarily a signal
in all cases.
...
I'd tend to say that distortion adds to noise side of the SNR, and
some can be corrected ...but *always* ? Let's say the distortion
is the result of clipping...
[ ...or maybe I've missed your point. ]
Later...
Absolutely always. Recall that distortion is a known condition
resulting from the communications channel itself. The output is
known *before* the signal is input. (E.g., clipping is not
arbitrary, and produces a very specific error signal.)
Which of course is something Shannon describes, and uses in
examples, in "A Mathematical Theory of Communication".
--
Floyd L. Davidson http://www.apaflo.com/floyd_davidson
Ukpeagvik (Barrow, Alaska)
Seems I must have missed something.
From my reading of that paper it would seem that it is only the case
in a closed loop, discrete system when the (mythical) perfect observer
and error channel exist to generate said error correction.
With a continuous source Shannon noted: " ... Since, ordinarily, channels
have a certain amount of noise, and therefore a finite capacity, exact
transmission is impossible. "
From the subject line I would expect to be dealing with continuous
source "ordinary" channels.
Ron Capik
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