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FFT from CSV data

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Harith Irfan
Harith Irfan 2020-2-4
回答： Vinai Datta Thatiparthi 2020-2-7
Hello there,
I have a vibration data on Amplitude vs Frequency and have no idea to apply Fast Fourier Transform (FFT) to revert it back to time domain. Reason being is I would like to acquire Amplitude vs Time data so I can obtain it into Velocity in time domain. If possible can I differentiate the data to transform it into Velocity vs Frequency and/or Acceleration vs Time?
I have no idea where to begin. I would be delighted with any help.
Thank you
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Star Strider
Star Strider 2020-2-4
The phase is uniformly zero. Without the phase information, it is not possible to reconstruct the complex Fourier transform from those data, so the inverse Fourier transform is not possible.

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回答（1 个）

Vinai Datta Thatiparthi
Hey Harith,
Adding to @StarStrider's points, when you're able to fix the input data, you can import this Excel sheet into a table in MATLAB using the function readtable. Functions FFT & IFFT can help you.

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