How to analyze phase of a FFT signal?

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Dominik Stolarz
Dominik Stolarz 2022-9-5
回答： Dinesh 2023-6-7
I have gathered phase of frequencies of FFT signal. The top left chart has been created for data collected while the device was working appropiately. Then the device has been damaged to simulate different kinds of exploitations. The rest of the charts has been created after damaging the device. How should I analyze this data? I want to find any information about possible damages based on the chart. X axis is Frequency[Hz] and Y axis is Phase[rad]
  2 个评论
David Goodmanson
David Goodmanson 2022-9-6
Hi Dominik,
Correlation coefficients might be a possibility, which you can obtain with 'corr'.
Dominik Stolarz
Dominik Stolarz 2022-9-6
Hi David, thanks for answering, i'll get back with the results

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回答（1 个）

Dinesh
Dinesh 2023-6-7
Hi Dominik,
There are many statistical measures that can be used to analyse the relationships. Some of them are.
  1. Correlation coefficient: quantifies the degree of association between two variables.
  2. Covariance: measures how much two variables change together
  3. t test: a statistical test used to determine if there is a significant difference between the means of two groups
Please refer to the following MATLAB documentations for more examples and details
  1. https://www.mathworks.com/help/matlab/ref/corrcoef.html
  2. https://www.mathworks.com/help/matlab/ref/cov.html
  3. https://www.mathworks.com/help/stats/ttest.html
Hope this helps!
Thank you.

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