On 6/20/22 2:39 AM, Magnus Danielson via time-nuts wrote:
So, a counter is really like an ADC for phase, with wide bandwidth
input and a sub-sampling mechanism (trigger/time-base). Through
processing frequency estimates can be provided. Aliasing occurrs in
the sub-sampling. Modern counters can provided estimation filters than
goes from a higher sub-sampling rate to a lower, which to some degree
removes aliasing, but not fully. These frequency estimation methods
form a form of decimation filter.
Cheers,
Magnus
An intruiging thought as I drink my first cup of coffee (meaning it's
not well thought out)..
jumping off from "counter is similar to an ADC for phase" - is there a
time domain equivalent for Nyquist criterion? Certainly there's the
cycle ambiguity.. you know when the zerocrossing occurred, but not how
many are in between (although a counter usually does). For everything
else there is a frequency/time duality, so I suspect there is. The
criterion is usually explained in terms of information - so there should
be an equivalent "has all the information" statement for counters/gate
widths/precisions.
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