topic Filter using FFT and IFFT (low pass, high pass or band pass) in Discussions

Filter using FFT and IFFT (low pass, high pass or band pass)

FN — Sun, 01 Dec 2019 13:25:11 GMT

I would like to filter out certain frequencies in a time series data set. With the spectral density in Time Series I can see the FFT and its peaks but I wonder if there is built-in filter to perform these type of DSP operations.

For example, with FFT() one can do the inverse to have a new signal with only the selected frequencies.

Re: Filter using FFT and IFFT (low pass, high pass or band pass)

ennisbl — Wed, 27 Nov 2019 14:17:35 GMT

Your best bet would be to export the data out to MATLAB, python or R to do the filtering and then import the data into JMP for visualisation. This was the solution proposed by @Daniel_Valente (staff member) in this post.

Re: Filter using FFT and IFFT (low pass, high pass or band pass)

Craige_Hales — Fri, 29 Nov 2019 02:55:31 GMT

And, if you want to explore using JSL's FFT function:

https://community.jmp.com/t5/Uncharted/FFT-and-DTMF/ba-p/28974

https://community.jmp.com/t5/Uncharted/FFT-Video/ba-p/21017

https://community.jmp.com/t5/Uncharted/Butterworth-2D-FFT-Filter/ba-p/216519

The first two operate on 1D data, looking for signals. The 3rd does a low-pass operation on 2D data to remove high frequency noise.