Power Spectral Density Estimates Using FFT
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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?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/170896/image.bmp)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/170897/image.jpeg)
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vijaya lakshmi
le 22 Mar 2018
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.
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