[time-nuts] windows for FFT measurements of phase noise

Attila Kinali attila at kinali.ch
Fri Jun 10 18:09:57 EDT 2016

Hoi Jim,

You know, you have this peculiar way of asking seemingly simple
questions that are very hard to answer? :-)

On Fri, 10 Jun 2016 12:42:13 -0700
jimlux <jimlux at earthlink.net> wrote:

> Say you have 1 second of sampled data (so the FFT resolution is 1 Hz). 
> If you're interested in the noise power at, say, 10 Hz away, a 
> rectangular window isn't going to be very far down, unless you have a 
> LOT of points in the FFT.

Maybe the book [1] can help you. It's chapter 2 contains infromation
on how to get spectral components from samples. And one point is
how windowing influences the result. Sorry, I cannot help you more
than that, I barely understand the topic myself.

				Attila Kinali

[1] "Spectral Analysis of Signals", by Petre Soica and Randolph Moses, 2005

Malek's Law:
        Any simple idea will be worded in the most complicated way.

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