Getting rid of errors in signal

[clausny]

Hi all.

I have a difficult problem. It is a little hard to explain but I will give it a chance. 

I would like to make

1. Each sample goes into a loop.

2. Then the loop must check whether the next sample in the array is within a range of plus / minus 3 y-values of the prevoius samples y-value.

3: If true then check next sample

4: If false (value is higher than plus/minus 3 y-values) it must reshape the sample value as the previous sample value.

Does it make sense? I would like the algorithm to serve as a kind of error detector.

Could anyone help me. I'am not quite familiar with LabVIEW.

Thanks!

[Coq_Rouge]

Use a for loop, auto indexing, and  a shift register. This sound like school work. So will not just hand over things. But feel free to post a VI. Showing at least that you have given it a try

[clausny]

Hi.

I'am in internship so yeah you can say it is a kind of shool work. But it is not like I haven't given it a try. I have sat for a few days now with this problem and as I mentioned I'am not used to work with LabVIEW and therefore not familiar with the various tools. But I think I'm learning 🙂

I just can't figure this out. You are welcome to see my VI.

Maybe you could give me a hint.

Thanks

[GerdW]

Hi clausny,

you already got a solution (atleast you marked it so) in your other thread.

What has changed since then (apart from the range limits)?

[clausny]

Hi GerdW.

This time a just want to get more precise. The solution you proposed were ok, but in some cases not good enough. So now I got this new idea but I just don't know how to make it.

I would like that every each sample is checked against the last preivous sample. This time not only the samples that exceeds a given threshold. 

1. Each sample goes into a loop.

2. Then the loop must check whether the next sample in the array is within a range of plus / minus 3 y-values of the prevoius samples y-value.

3: If true then check next sample

4: If false (value is higher than plus/minus 3 y-values) it must reshape the sample value as the previous sample value.

[GerdW]

Hi clausny,

so all you need is one more shift register to get the previous sample and some little math (subtract) to get the difference between current and previous sample!

Is this so complicated?

Also step 4 isn't well defined. Should the loop stop at false case or continue with step 2?

[clausny]

Well yes I think it's complicated.

I don't think I can use the "In range and coerce" for this. Can I? Because I can't take that last value and then make this plus/minus 3 interval for the given sample.

Step 4: It should continue with step 2. 

[Coq_Rouge]

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@clausny wrote:

Well yes I think it's complicated.

I don't think I can use the "In range and coerce" for this. Can I? Because I can't take that last value and then make this plus/minus 3 interval for the given sample.

Step 4: It should continue with step 2. 

---

You have made a good descriptions of your problem. Why do you not just follow your own description step by step.

[clausny]

Well I'am really trying!

Can you tell me how to make this interval of +/- 3 y-value for each value?

[GerdW · Accepted solution]

Hi clausny,

it's just some math, so look at the elementary math palette: