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Appendix B
141
Models SE and DL
LDN
Representing the Day/Night sound level, this measurement is a 24-hour average sound level
where 10 dB is added to all of the readings that occur between 10pm and 7am. This is
primarily used in community noise regulations where there is a 10 dB “penalty” for night time
noise. Typically LDN’s are measured using A weighting, a 3 dB Exchange Rate, and no
Threshold.
L_
Mn
Minimum SPL. Lowest SPL measured over a time interval.
L_
Mx
Maximum SPL. Highest SPL measured over a time interval.
Logging
In sound studies, the saving of measurements at fixed intervals during a study, where each
measurement is determined from data processed in the previous logging interval.
L_
Pk
Peak SPL. This is the highest SPL value obtained during a study or a session. A peak SPL
measurement is affected by the frequency response setting but not by the time response
setting of the meter.
Octave band
An Octave band is defined as a frequency band whose upper band-edge frequency is twice
the lower band frequency.
Noise
Unwanted sound.