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 Unit of frequency FFT transform		  New Topic  Reply to Topic
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bharat123

Canada
1 Posts
Posted - 06/17/2015 :  10:44:08 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hello,
I am trying to do Fourier transform using FFT on my data. I have exponential decay data. I am confused on the frequency unit (what is frequency here, is it f or omega and unit is Hz or rad/sec), I don't understand how it calculates the frequency. And why am I getting the results on half of my data, meaning that if I have 1000 values, frequency shows only 500 data.

Appreciate your help.

Thank you.

JacquelineHe

287 Posts
Posted - 06/18/2015 :  01:56:01 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

For Fast Fourier Transform, the frequency column is obtained from the sampling interval △t and the number of input data points N.

Please refer to the algorithms of Frequency for FFT.
http://www.originlab.com/doc/Origin-Help/FFT1-Algorithm

Thanks
Jacqueline
OriginLab
Edited by - JacquelineHe on 06/18/2015 01:56:53 AM
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