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F r o m W i k i p e d i a , t h e f r e e e n c y c l o p e d i a
( R e d i r e c t e d f r o m S o u n d e x p o s u r e l e v e l )
Sound exposure is the integral, over time, of squared sound pressure . The SI unit of sound exposure is the pascal squared second (Pa 2 ·s).
Mathematical definition [ edit ]
Sound exposure, denoted E , is defined by
E
=
∫
t
0
t
1
p
(
t
)
2
d
t
,
{\displaystyle E=\int _{t_{0}}^{t_{1}}p(t )^{2}\,\mathrm {d} t,}
where
the exposure is being calculated for the time interval between times t 0 and t 1 ;
p(t ) is the sound pressure at time t , usually A-weighted for sound in air.
Sound exposure level [ edit ]
Sound exposure level (SEL) is a logarithmic measure of the sound exposure of a sound relative to a reference value.
Sound exposure level, denoted L E and measured in dB , is defined by[1]
L
E
=
1
2
ln
(
E
E
0
)
N
p
=
log
10
(
E
E
0
)
B
=
10
log
10
(
E
E
0
)
d
B
,
{\displaystyle L_{E}={\frac {1}{2}}\ln \!\left({\frac {E}{E_{0}}}\right)\!~\mathrm {Np} =\log _{10}\!\left({\frac {E}{E_{0}}}\right)\!~\mathrm {B} =10\log _{10}\!\left({\frac {E}{E_{0}}}\right)\!~\mathrm {dB} ,}
where
E is the sound exposure;
E 0 is the reference sound exposure;
1 Np = 1 is the neper ;
1 B = 1 / 2 ln 10 is the bel ;
1 dB = 1 / 20 ln 10 is the decibel .
The commonly used reference sound exposure in air is[2]
E
0
=
400
μ
P
a
2
⋅
s
.
{\displaystyle E_{0}=400~\mathrm {\mu Pa^{2}\cdot s} .}
The proper notations for sound exposure level using this reference are L W /(400 μPa2 ⋅s)or L W (re 400 μPa2 ⋅s) , but the notations dB SEL , dB(SEL) , dBSEL, or dBSEL are very common, even if they are not accepted by the SI.[3]
References [ edit ]
^ Ross Roeser, Michael Valente, Audiology: Diagnosis (Thieme 2007), p. 240.
^ Thompson, A. and Taylor, B. N. sec 8.7, "Logarithmic quantities and units: level, neper, bel", Guide for the Use of the International System of Units (SI ) 2008 Edition , NIST Special Publication 811, 2nd printing (November 2008), SP811 PDF
R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=Sound_exposure&oldid=1217996442#Sound_exposure_level "
C a t e g o r y :
● S o u n d m e a s u r e m e n t s
● T h i s p a g e w a s l a s t e d i t e d o n 9 A p r i l 2 0 2 4 , a t 0 4 : 0 4 ( U T C ) .
● T e x t i s a v a i l a b l e u n d e r t h e C r e a t i v e C o m m o n s A t t r i b u t i o n - S h a r e A l i k e L i c e n s e 4 . 0 ;
a d d i t i o n a l t e r m s m a y a p p l y . B y u s i n g t h i s s i t e , y o u a g r e e t o t h e T e r m s o f U s e a n d P r i v a c y P o l i c y . W i k i p e d i a ® i s a r e g i s t e r e d t r a d e m a r k o f t h e W i k i m e d i a F o u n d a t i o n , I n c . , a n o n - p r o f i t o r g a n i z a t i o n .
● P r i v a c y p o l i c y
● A b o u t W i k i p e d i a
● D i s c l a i m e r s
● C o n t a c t W i k i p e d i a
● C o d e o f C o n d u c t
● D e v e l o p e r s
● S t a t i s t i c s
● C o o k i e s t a t e m e n t
● M o b i l e v i e w