Power Spectral Density Estimates Using FFT

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Mo
Mo 2018-3-1
回答： Omer Sayli 2024-9-9
I used PSD through FFT and the numbers in my plot (Y-axis) are not less than 1 as I expected to see in PSD result. I attached the sample function and the plot. Is something wrong with my function that should be changed?

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回答（2 个）

vijaya lakshmi
vijaya lakshmi 2018-3-22
Hi Mo,
To compute the power spectral density using the FFT function, the absolute value FFT output has to be squared and scaled by (1/length(data))*(1/Fs) where Fs is the sampling frequency. This result is then converted to decibels.
I observe that you haven't converted the result in decibels.This might be causing to the numbers along y-axis to be greater than 1.
Omer Sayli
Omer Sayli 2024-9-9

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