Help me apply labview filter

[3d0g]

"One question I have is should a window even be used in this application? Why? "

Yes, because the DFT produces more leakage if the signal is not periodic.  But what does it take to make the signal periodic?  I'm still researching that.  

[santo_13]

Coherent sampling is used to ensure complete cycles of a periodic signal.

[wiebe@CARYA]

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@3d0g wrote:

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It's not hard 

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Options (right top of the message)>Edit Repl

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Actually it is when the option doesn't exist.  You have it.  I don't.

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Ah OK.

You might need some credit (nr. of points, sign in date, kudos or solutions) to get that privilege then.

You can't be far off, you'd obviously not a spammer.

EDIT: Also, you can't edit after people viewed or replied to your message. Not sure what the criteria are, but there are limits.. It would be weird if you could edit your messages after people replied to it.

[3d0g]

I request you please elaborate a little when you get a chance.

I'm seeing periodicity as making sure you're at zero at the beginning and end of the multiple-frequency-containing data set.  However, were it that simple, why would there be so many different window options from which to choose?  It cannot possibly be that simple.

[3d0g]

can't edit a post so

Perhaps the better definition of periodic, besides repeats, is continuous.  The waveform should not have discontinuities due to its ends. Using a window forces this as both ends start at zero.  By "coherent," I'm thinking what's being meant is the zero crossings of all frequencies contained coincide, but I need to explain.  For instance, 1Hz and 3Hz are "coherent" if they both start at the same time.  Is that what you meant?

I'd really like further explanation of what was meant by "coherent."

[3d0g]

rather, what was meant by "coherent sampling."  I'll try Google.

[3d0g]

Ok, I know what coherent sampling is, now.  Coherent sampling is sampling such that there is an integer number of periods in the sample.