| T O P I C R E V I E W |
| vlnew |
Posted - 04/18/2022 : 09:37:13 AM
Hello,
I am doing Fourier transform of a very regular and smooth sinus-like function. As a result I expect a very smooth Fourier transform with easily detectable frequency maxima. But am getting an output which is calculated with large "time steps" on the X axis. How to decrease these steps?
Thanks! |
| 1 L A T E S T R E P L I E S (Newest First) |
| Sam Fang |
Posted - 04/20/2022 : 04:05:14 AM
Hi vlnew,
Frequency resolution in FFT was determined by:
df=1/(N*dt)
To decrease df, you can increase number of input data N or sampling interval dt.
If your input data can't be changed, you can also try Origin's Zoom FFT app.
https://www.originlab.com/fileExchange/details.aspx?mode=sandbox&fid=878
This app requires Origin2022 temporarily.
Thanks.
Sam
OriginLab Technical Services |
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