User manual

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Appendix
Appendix 4: Common Sound Levels
Display Application Setting
L
AE
Sound Exposure Level
The sound exposure level L
AE
characterizes the totalenergy con-
tent of a signal and corresponds to the LAeq normalized to one
second. The sound exposure level is measured for example to
compare noise events with different time durations. The L
AE
re-
ports the amount of noise from an event such as an individual
aircraft fly-over. An earlier used level name is SEL.
L
AE
= L
Aeq
+ 10 x log (time in seconds)
->
L
Aeq
Time-Average Sound Level or
Equivalent Continuous Sound Level
Averaged sound level over time with A frequency weighting.
-> ->
L
Aeq
dt Level LAeq_dt “delta t” in report
Level of the preset logging interval in the LOG-menu; e.g. Log-
ging interval = 1 second, then LAeq_dt is the time averaged level
of the past 1 second.