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 Periodic signal: how to determine the frequency?		  New Topic  Reply to Topic
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vlnew

United Kingdom
35 Posts
Posted - 12/02/2017 :  8:14:20 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
OriginPro 2017 SR2 b9.4.2.380
Operating System: Win7

Hello!

I am analysing a periodic signal, which contains a periodic component, a trend component and noise component. I am only interested in the periodic component, and in particular, I am only interested in determining the period (1/frequency) of this signal. I tried FFT and autocorrelation, but did not succeed. What is the best way to solve this problem?

Thanks!

cpyang

USA
1406 Posts
Posted - 12/03/2017 :  9:54:19 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Can you give some details on how FFT didn't work for you? Maybe you can show some images?

Maybe you should subtract the trend component with a linear fit?


CP
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