[time-nuts] decimation versus decimation

[Bob kb8tq]

Hi

In the common vernacular “decimation” does indeed mean “just throw the rest away”. 
You can find papers where that *is* what’s being done with samples and that term is 
used. Downsample also means “just throw them away”……

Bob

> On Feb 25, 2020, at 9:55 AM, Dana Whitlow via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> 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) eliminate aliasing".
> 
> Which is it?  And if the answer is "both", then shouldn't we all
> be very careful to explicitly specify which meaning applies to
> the situation at hand whenever we use the term "decimation"?
> 
> Thanks,
> 
> Dana    K8YUM
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