The Sound pressure level reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Sound pressure level

Sound pressure level or sound level L_p is calculated in decibels as

Reference sound pressure is

= 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.

See also: Acoustics

External Weblink

• Conversion of sound pressure level to sound pressure

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