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FFT Bandblock Filter for not equidistant x-axis

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Poffel1985

Germany
17 Posts

Posted - 10/21/2015 : 09:24:58 AM

Hi, i'm using Origin 2015.
I want to use a FFT bandblock filter for my data.
At the moment I use the following script:
fft_filters -r 2 filter:=bandblock freq1:=val1 freq2:=val2;
Unfortunately my x-axis is nonlinear/not equidistant. Therefore, the result is not correct. I don't want to interpolate my data before filtering. Is there an easy option to do a nonlinear FFT/NFFT using a labtalk script? (I'm using Labview and execute labtalk commands)

I also looked at:
http://www.originlab.com/doc/OriginC/ref/fft_real
However, I was not able to test this (command errors).

best regards

Shirley_GZ

China
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Posted - 10/22/2015 : 03:15:56 AM

Hi,

For your case, you need first do interpolation to make the X values be uniformly-spaced, although you said you don't want to interpolate your data.
Since you are using LabVIEW, you can use the X-Function below to write and run LabTalk script to interpolate your data and perform FFT Filtering:

http://www.originlab.com/doc/X-Function/ref/interp1xy

Thanks,
Shirley

Originlab Technical Service Team

Edited by - Shirley_GZ on 10/22/2015 03:22:19 AM

Poffel1985

Germany
17 Posts

Posted - 10/22/2015 : 08:19:44 AM

Ok, thank you. I will try this way

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