All Forums  Origin Forum  Origin Forum  Start and stop frequency of FFT low-pass filter

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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by AnnikaGo[/i] [br]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 [b]parabolic low-pass filter[/b]: "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 [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.