: Tue, Feb 25, 2020 7:41 am
Subject: Re: [time-nuts] decimation versus decimation
The Ancient Romans had another,
not so nice, definition.
73, Dick, W1KSZ
On Tue, Feb 25, 2020 at 7:56 AM Dana Whitlow via time-nuts <
time-nuts@lists.febo.com> wrote:
> I'm confused:
>
> I seem
Precisely, Dick!
On Tuesday, February 25, 2020, Richard Solomon via time-nuts <
time-nuts@lists.febo.com> wrote:
> The Ancient Romans had another,
> not so nice, definition.
>
> 73, Dick, W1KSZ
>
> On Tue, Feb 25, 2020 at 7:56 AM Dana Whitlow via time-nuts <
> time-nuts@lists.febo.com> wrote:
>
>
Please note that I have little real interest in measuring ADEV. My
interest lies almost
solely in measuring phase variations of a received signal via some
propagation path,
not in any statistical sense but looking at actual waveforms plotted as
phase versus
time. I am working towards measurement
Some of the confusion might come from different measurement systems dealing
with different data, either phase (in seconds), or frequency (fractional).
Sub-sampling works for phase-data, just throw away the in-between samples
and look at phase samples that are tau-distance apart.
Decimation works
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.
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Hi
If you take a look at how ADEV has been traditionally done for many
decades, they *do* indeed “decimate without the filter”. There is no
re-filtering process as you go from 1 to 2 to 10,000 second tau.
Bob
> On Feb 25, 2020, at 10:33 AM, Hal Murray via time-nuts
> wrote:
>
>
>> One mean
The Ancient Romans had another,
not so nice, definition.
73, Dick, W1KSZ
On Tue, Feb 25, 2020 at 7:56 AM Dana Whitlow via time-nuts <
time-nuts@lists.febo.com> wrote:
> I'm confused:
>
> I seem to see multiple (at least double) meanings for the term
> 'decimation'.
>
> One meaning is simply: "ta
> 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?
Unless you are doing something tricky, it doesn'
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
us
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
> wro
Hi Dana,
On 2020-02-25 15:55, Dana Whitlow via time-nuts 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".
This is sub-sampling.
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
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