How would I use FFT for derivatives?
Mon, 08/29/2016 - 05:42 pm
- FFT a spectrum
- cut noise above a specific frequency
- measure a characteristic parameter in the derivative
I've got the tools to do the FFT and remove the noise. I know how to get this to work well, and I know it is a more rigorous smoothing method than N-point smoothing. I don't yet have the full appreciation of the derivative in FFT space. I found this reference ...
... and note in particular Algorithm 1 on page 5. I think this can be directly implemented in Igor Pro. Has anyone gone down this path to do a derivative in FFT space?