Rate at which sound energy is reflected or transmitted per unit time
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Sound measurements
Characteristic
Symbols
Sound pressure
p, SPL, LPA
Particle velocity
v, SVL
Particle displacement
δ
Sound intensity
I, SIL
Sound power
P, SWL, LWA
Sound energy
W
Sound energy density
w
Sound exposure
E, SEL
Acoustic impedance
Z
Audio frequency
AF
Transmission loss
TL
v
t
e
Sound power or acoustic power is the rate at which sound energy is emitted, reflected, transmitted or received, per unit time.[1] It is defined[2] as "through a surface, the product of the sound pressure, and the component of the particle velocity, at a point on the surface in the direction normal to the surface, integrated over that surface." The SI unit of sound power is the watt (W).[1] It relates to the power of the sound force on a surface enclosing a sound source, in air.
For a sound source, unlike sound pressure, sound power is neither room-dependent nor distance-dependent. Sound pressure is a property of the field at a point in space, while sound power is a property of a sound source, equal to the total power emitted by that source in all directions. Sound power passing through an area is sometimes called sound flux or acoustic flux through that area.
^ abRonald J. Baken, Robert F. Orlikoff (2000). Clinical Measurement of Speech and Voice. Cengage Learning. p. 94. ISBN 9781565938694.
^"ISO 80000-8(en) Quantities and Units - Acoustics". [ISO].
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