Sound pressure level

Sound pressure level (SPL) or sound level Lp is a logarithmic measure of the energy of a particular noise relative to a reference noise source.

Related Topics:
Logarithmic measure - Energy

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L_mathrm{p}=20, log_{10}left(rac{p_1}{p_0} ight)=10, log_{10}left(rac{p_1^2}{p_0^2} ight) mbox{ dB SPL}

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:where p_0 is the reference sound pressure and p_1 is the sound pressure being measured.

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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.

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