Power Spectral Density Estimates Using FFT
151 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
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)
0 commentaires
Réponses (1)
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.
0 commentaires
Voir également
Catégories
En savoir plus sur Spectral Estimation dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!