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Sound pressure level (SPL) or sound level Lp is calculated in decibels compared to a reference sound pressure.
- <math>
L_p=20\, \log_{10}\left(\frac{p_1}{p_0}\right)=10\, \log_{10}\left(\frac{p_1^2}{p_0^2}\right) \mbox{dBSPL}
<math>
The reference sound pressure is
- <math>p_0 = 2 \cdot 10^{-5} \mathrm{Pa}
<math>
- = 20 µPa (micropascal), (Pa = pascal = N / m²; N = newton)
It can be useful to express sound pressure in this way when dealing with hearing, as the perceived loudness of a sound correlates roughly logarithmically to its sound pressure. Even the microphones work this way and our eardrums. They cannot convert the sound intensity.
See also
External link
de:Schalldruckpegel
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