Hi all

I have a set of data (table 1 d with a value of 500) and I use the basic filter of the LV (smootihing with average mobile, rectangular, half width = 1) for smoothing noisy data. As you can see in the photo, the curve smoothed red seems to offset 2 pixels with respect to the original blank data. If I take the difference btw the original and the filtered data in the measurement of noise (green curve), then it will be exaggerated due to this change. You can write code to compensate for this, but I wonder if there is a way to correct it in LV also, what are the causes exactly this change?

The second photo shows the sub vi to do filtering, etc.

Thank you!

The moving average of smoothing itself is a low pass filter. Like any digital filter, it has the answer. Don't forget, phase in nature is the delay in time. There are some filters with zero delay/linear delay but apparently the smoothing filter isn't one of them. When you configure the filter, transfer function Select display mode, you can find the answer in the second chart. Notice that it has a non zero delay to phase in most frequencies.

You can also increase the width of the filter and you should be able to watch the delay increases as well. So, not much you can do with it other that realign the signal after filtering if you wish.

Tags: NI Software

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