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11 Glossary
Time-Weighted Sound Pressure Level (SPL)
Expressed in dB, the SPL represents the sound level of the running time-weighted average of a sound
pressure signal observed at a specific time.
()=10
1
()
W is the time-weight indication, F for Fast and S for Slow
τ
W
is the time constant for the time-weight 0.125s for Fast and 1s for Slow
p(t) is the sound pressure signal;
p
0
is the reference sound pressure (2x10
-5
Pa.)
Equivalent Continuous Sound Level (Leq)
Expressed in dB, the Leq,T represents the equivalent continuous sound level of a sound pressure
signal observed for a specific time interval.
, =10
1
()
T is the averaging time interval;
p(t) is the sound pressure signal;
p
0
is the reference sound pressure (2x10
-5
Pa.)
Peak Sound Level (Lpk)
Expressed in dB, the Lpk represents the sound level of the maximum of a squared sound pressure
signal observed for a specific time interval.
=10
(
(
)
,T
)
T is the observation time interval;
p(t) is the sound pressure signal;
p
0
is the reference sound pressure (2x10
-5
Pa.)
Maximum and Minimum Sound Pressure Level (Lmax, Lmin)
Expressed in dB, the Lmax and Lmin represent the maximum and minimum time-weighted sound
pressure level observed for a specific time interval.
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