Sound intensity level

Sound intensity level or acoustic intensity level is a logarithmic measure of the sound intensity in comparison to the reference level of 0 dB (decibels).

The measure of a ratio of two sound intensities is:$L\_mathrm\{J\}=10,\; log\_\{10\}left(frac\{J\_1\}\{J\_0\}\; ight)\; mathrm\{dB\}\; ,$

where "J"₁ and "J"₀ are the intensities.

The sound intensity level is given the letter "L_J" and is measured in "dB". dB is dimensionless.

If J₀ is the standard reference sound intensity, where:$J\_0\; =\; 10^\{-12\}\; ,\; frac\{mathrm\{W\{mathrm\{m\}^2\}\; ,$

(W = watt), then instead of "dB" we use "dB SIL". (SIL = sound intensity level).

External links

* [http://www.sengpielaudio.com/calculator-soundlevel.htm Conversion: Sound intensity level to sound intensity and vice versa]
* [http://www.sengpielaudio.com/calculator-ak-ohm.htm Ohm's law as acoustic equivalent - calculations]
* [http://www.sengpielaudio.com/RelationshipsOfAcousticQuantities.pdf Relationships of acoustic quantities associated with a plane progressive acoustic sound wave - pdf]
* [http://www.sengpielaudio.com/TableOfSoundPressureLevels.htm Table of Sound Levels - Corresponding Sound Intensity and Sound Pressure]