[time-nuts] Phase, One edge or two? (was Digital mixing with a D Flip Flop)

Bob Camp kb8tq at n1k.org
Wed Oct 22 20:11:52 EDT 2014


Hi

There are a number of papers out there that talk about decimation vs averaging for ADEV. They have various data sets processed by both techniques. 

Bottom line - decimation does a better job than averaging for ADEV. At least that’s true if you want the result to resemble the “real” ADEV of the source(s).

Bob

> On Oct 22, 2014, at 6:45 PM, Tom Van Baak <tvb at LeapSecond.com> wrote:
> 
>>> 3) Every instant on a sine wave is actually a data point, not just
>>> the zero crossing(s). So in reality there is near infinite information
>>> available.
>> 
>> Sorry, but no.
>> 
>> If you tell me it is a sine and give me the time of two zero crossings
>> I can tell you everything there has or ever will be to know about any
>> point on that sine-wave.
> 
> What about phase noise measurements? It's the distortion from a mathematically ideal sine wave that allows one to make L(f) plots out to MHz and GHz. TimePod also gives you AM noise plots; you don't get that from just looking at zero crossings.
> 
> /tvb
> 
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