[time-nuts] T.I. questions
Chuck Harris
cfharris at erols.com
Fri Feb 6 08:29:33 EST 2015
Pulse width modulation.
Suppose the readings go like this:
6,5,5,5,5,5,5,5,5,5,6,5,5,5,5,5,5,5,5,6,5,5,5,5,5,5,5,5,5,5
you would be able to interpolate that result to be 5.1
If it went:
6,6,5,5,5,5,5,5,5,5,6,6,5,5,5,5,5,5,5,5,6,6,5,5,5,5,5,5,5,5
You would be able to interpolate that result to be 5.2
Or:
6,6,6,6,6,5,5,5,5,5,6,6,6,6,6,5,5,5,5,5,6,6,6,6,6,5,5,5,5,5
would be 5.5
and on down the road until you achieved:
6,6,6,6,6,6,6,6,6,5,6,6,6,6,6,6,6,6,6,5,6,6,6,6,6,6,6,6,6,5,...
which would be 5.9
I am certain that I have miscounted somewhere (everywhere?), and
the digits displayed are not required to be so ridged in how they
distribute, just that you are getting ratios between one and the
other.
-Chuck Harris
Bill Hawkins wrote:
> Referring to a 1952 manual on servo systems, jitter seems to be noise
> in the system, while dither is intentionally introduced to get a servo
> through its dead space (usually caused by static friction).
>
> The dead space in a counter is the interval between least significant
> integers.
> Thus the amplitude of the dither is the size of that dead space at a
> frequency
> that will be lost in the average.
>
> I can see how this would work for a servo system, but how can a counter
> display
> more resolution than its least significant digit?
>
> Bill Hawkins
>
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