Hi Matthias,
On 2022-05-14 12:30, Matthias Welwarsky wrote:
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.
I agree. Good that we come to the same conclusion.
I just have not had time to run simulation and check, and I would check
both spectrum and ADEV, but there is other tests to do such as
autocorrelation function. A more unusual one is the increase of
deviation of an ensamble of simlations, and thus the spread it can take.
It depends clearly on the noise-type and length of sequence.
Cheers,
Magnus
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