[time-nuts] Fwd: Two questions about counters

[Erik Kaashoek]

See forwarded message from Enrico Rubiola.
Erik

-------- Forwarded Message --------

Erik,
I got your message from JMF (CC), be free to forward to the time nuts list.

First question.
We work with equally spaced time stamps of the incoming signal.
Basically, the LR gives a straight line like y = a*x + b (high-school 
notation).
The enhanced resolution counter estimates b, which is the average 
frequency in the measurement interval if the origin of the xy plane is 
chosen appropriately.
The LR counter estimates a, which is the a
The LR has approx 1.5 dB better rejection of noise (better estimation of 
frequency)

There is an updated version of the slideshow you mention, split between
https://rubiola.org/pdf-lectures/Scientific%20Instruments%20L01-05,%20Instruments.pdf
https://rubiola.org/pdf-lectures/Scientific%20Instruments%20L06-10,%20Oscillators.pdf
(open lectures for PhD students and young scientists)

Look at p.48 and p.50 of the 2nd slideshow.

I can't answer your second question now.



-- 
Enrico Rubiola
https://rubiola.org
https://efts.eu



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