Sound power level

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

The measure of a ratio of two sound powers is

where W₁ and W₀ are the powers.

The sound power level is given the letter "L_w" or SWL and is measured in "dBW". dB is dimensionless. SPL stands for sound pressure level, and is not the same thing.

If W₀ is the standard reference sound power, where

W₀ = 10 ^{− 12}W

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

Sound measurements

• Sound power
• Sound power level (SWL)
• Sound pressure
• Sound pressure level (SPL)
• Sound intensity
• Sound intensity level (SIL)
• Particle velocity
• Particle velocity level (sometimes called Sound velocity level) (SVL)
• Sound energy flux
• Acoustic impedance
• Speed of sound

Wikipedia (http://en.wikipedia.org/wiki/Main_Page) Sound_power_level (http://en.wikipedia.org/wiki/Sound_power_level) version history (http://en.wikipedia.org/w/index.php?title=Sound_power_level&action=history) GNU Free Documentation Lizenz (http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License) CC-by-sa (http://creativecommons.org/licenses/by-sa/2.5/)

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