Sound energy density level
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The sound energy density level gives the ratio of a sound incidence as a sound energy value in comparison to a reference level of 0 dB (DIN 45630). It is a logarithmic measure of the ratio of two sound energy densities.
The energy produced by vibrations is known as sound
where E1 and E0 are the energy densities. The unit of the sound energy density level is the decibel (dB).
- DIN 1320: Acoustics, Version 1997-06, Beuth publishing