[time-nuts] Re: Simple simulation model for an OCXO?

[Matthias Welwarsky]

On Samstag, 14. Mai 2022 18:43:13 CEST Carsten Andrich wrote:
> However, even for the 2^16 samples used by the CCRMA snippet, the filter
> slope rolls off too quickly. I've attached its frequency response. It
> exhibits a little wobbly 1/f power slope over 3 orders of magnitude, but
> it's essentially flat over the remaining two orders of mag. The used IIR
> filter is too short to affect the lower frequencies.

Ah. That explains why the ADEV "degrades" for longer tau. It bends "down". For 
very low frequencies, i.e. long tau in ADEV terms, the filter is invisible, 
i.e. it passes on white noise. That makes it indeed unusable, for my purposes.

BR,
Matthias