[time-nuts] decimation versus decimation

[Alex Pummer]

in original -- Latin -- it means;  take every tenth
73
KJ6UHN
  Alex

On 2/25/2020 7:15 AM, Bob kb8tq via time-nuts wrote:
> 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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