How to smooth signal and find dominant freqeuncy using FFT?

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Steven on 24 Sep 2015
Answered: Samudrala Jagadish on 27 Sep 2015
Hi. I am not so familiar with signal processing. I have this oscillation which I like to find its dominant frequency. I used FFT, but it does not give me any specific value.
After all, can we define any frequency for this kind of oscillations? How can I smooth the data? I used filter and sgolayfilt, but they didn;t change the data at all.
Thanks in advance!

Answers (1)

Samudrala Jagadish
Samudrala Jagadish on 27 Sep 2015
If you want to smooth the given signal without using FFT Filtering, they you may use a concept called "Moving Average Filter" Please follow my file exchange link as given below it contains a code to smooth a signal upto some extent
here is the link:

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