Re: [time-nuts] decimation versus decimation

2020-02-25 Thread Dana Whitlow via time-nuts
s that is 10-fold shorter, and compute adev from that. > > FWIW IIRC all the allantools examples/tests that (successfully) compare > results against Stable32, using frequency input data, just use simple > non-overlapping 'boxcar' decimation - nothing more fancy or elabora

Re: [time-nuts] decimation versus decimation

2020-02-25 Thread Dana Whitlow via time-nuts
Let's see if I have this correct, then: "Decimation" refers to the two-step procedure (filtering followed by picking every nth sample), and "Sub-sampling" (or "downsampling") properly refers to taking every nth sample and discarding the rest. Is this correct? And thanks for all the responses.

[time-nuts] decimation versus decimation

2020-02-25 Thread Dana Whitlow via time-nuts
I'm confused: I seem to see multiple (at least double) meanings for the term 'decimation'. One meaning is simply: "take every nth sample and discard the others without regard to possible aliasing". The other meaning is: "take every nth sample, but first prefilter as appropriate to (sensibly) eli