| T O P I C R E V I E W |
| AnnikaGo |
Posted - 03/31/2022 : 08:46:28 AM
Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 2022 (64-bit)
9.9.0.220
Operating System: Windows 10 Home
Dear all,
when using the Smooth Dialog Box, I can choose FFT filter, which according to the Algorithms - Smooth page (https://www.originlab.com/doc/Origin-Help/Smooth-Algorithm#The_FFT_Filter_method) leads to the application of a parabolic low-pass filter:
"The function used to clip out the high-frequency components is a parabola with a maximum of 1 at zero frequency, and falling off to zero at the cutoff frequency."
My understanding is that I need a start and a stop frequency, when applying a parabolic FFT-filter (like in the FFT Filters Dialog, https://www.originlab.com/doc/en/Origin-Help/FFT-Filter-Dialog).
Therefore, I do not understand, what exactly Origin uses as a start and stop frequency, when I use FFT Filter in the Smooth Dialog Box as I am only able to specify a cuttoff frequency there.
Your help is highly appreciated! Thank you very much in advance,
Annika |
| 2 L A T E S T R E P L I E S (Newest First) |
| AnnikaGo |
Posted - 04/01/2022 : 07:29:45 AM
Thank you, Yuki, for your clear and helpful answer! |
| yuki_wu |
Posted - 04/01/2022 : 02:22:58 AM
Hi Annika,
The value of Cutoff you enter is the stop frequency while 0 is the pass frequency.
Regards, Yuki
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