Sound pressure level

Sound pressure level (SPL) or sound level L_p is calculated in decibels compared to a reference sound pressure.

$L_p=20\, \log_{10}\left(\frac{p_1}{p_0}\right)=10\, \log_{10}\left(\frac{p_1^2}{p_0^2}\right) \mbox{dBSPL}$

The reference sound pressure is

$p_0 = 2 \cdot 10^{-5} \mathrm{Pa}$

= 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.

External link

Conversion of sound pressure level to sound pressure (http://www.sengpielaudio.com/calculator-soundlevel.htm)

de:Schalldruckpegel

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Sound pressure level

See also

External link