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 Unit of frequency FFT transform

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T O P I C    R E V I E W
bharat123 Posted - 06/17/2015 : 10:44:08 AM
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.
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JacquelineHe Posted - 06/18/2015 : 01:56:01 AM
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

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