SmartSMS User Manual
Soft dB inc.
User Manual
p. 41
The Lx% selection selector is a statistical analysis tool used during or after
measurements. The L1%, L50% or L90% values represent the level
occurring 1%, 50% or 90% of the time. If the L90% value is 43 dB(A), that
means that the sound level is equal to, or above, 43 dB(A) 90% of the time.
The L1% represents the peak noise that is only present 1% of the time. Leq
is the standard average value, without statistical analysis.
The Leq value is selected by default for the measurement of the acoustic
response of the room. For the background noise measurement, the default
value is L50%, which allows acoustical events that may have occurred
during the background noise measurement, but that are not part of the
background noise, to be removed.
When the Background noise measurement is done, two options are
available. If the background noise measurement is not correct or is not
satisfactory, you can click on "Bypass Measurement" to preserve the
current background noise already active in the current configuration file.
Only the acoustic room response will be updated. If the background noise is
not typical for some reason, you can click on "Import default BG noise" to
load a typical background noise spectrum instead of the measured noise.
