MATLAB: PSD question

units question

What are the units of the Y axis of this code? I think it's dB/Hz but I'm not sure.
fs=2000;
Hs=spectrum.periodogram; % Use default values
psdest = psd(Hs,Signal,'Fs',fs);
semilogx(psdest.Frequencies,10*log10(psdest.Data));
grid on;

Best Answer

Yes, it is dB/Hz.
psdest.Data are the power estimate, proportional to magnitude-squared of the DFT. So 10*log10() is in dB
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