C
-
4
Glossary and Formulas
LxT Manual
The continuous equivalent sound level is generally
calculated on an hourly basis and is shown in the equation as
L. The levels for the hourly periods from midnight to 7 a.m.
have 10 added to them to represent less tolerance for noise
during sleeping hours. The same occurs from 10 p.m. to
midnight. The levels for the hourly periods between 7 p.m.
and 10 p.m. have 5 added to them to represent a lessened
tolerance for noise during evening activities. They are
energy summed and converted to an average noise exposure
rating.
The day-evening-night level L
DEN
is defined by the
following formula:
In the default form, the day has eight hours, the evening has
four hours and the night has eight hours, as can be seen in
the equation. The default times for these periods are as
follows
• Day: 07.00 to 19.00
• Evening: 19.00 to 23.00
• Night: 23.00 to 07.00
Lday, Levening and Lnight are A-weighted long-term
average sound levels measured during the day, evening and
night, respectively.
Lden
10log10
1
24
------
10
Li
10
+
10
0000
0700
10
Li
10
0700
1900
10
Li
5
+
10
1900
2200
10
Li
10
+
10
2200
2400
+
+
+
=
DEN
L
=
10
10
10
5
10
10
*
8
10
*
4
10
*
12
24
1
lg
10
Lnight
Levening
Lday
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