
Spectral power density
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Nyquist Team
Acoustic signal analysis is not just a question of "how loud?", but above all, "where does the energy lie?" When dealing with noise or complex sounds, regular power measurement is not enough. We need to look deeper, using a tool that slices sound into the thinnest possible frequency slices.

Professional Definition
> Power Spectral Density (PSD) – a measure of the power distribution of a signal in the frequency domain.
The unit is W/HzW/HzW/Hz
or Pa2/HzPa^2/HzPa2/Hz
. Essential for analyzing random noise.
## Acoustics in Simple Words
If the rain on the sidewalk is the total power, then the PSD tells us how much water falls on each specific millimeter of that sidewalk.
## Summary
Allows us to precisely determine which frequencies carry the most energy in noise.
See also
Office / Showroom
Production / Warehouse
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