LxT Manual
Glossary and Formulas
C
-
7
Table 1 shows the actual value of a specific item, such as
sound power, for which the sound level is calculated. First,
the sound power value is divided with the reference used and
then the ten-based logarithm is applied. This value is then
multiplied by 10 to create the decibel value.
Each time the sound
pressure
level increases by 6 dB, the
corresponding sound
pressure
value is doubled. Each time
the sound
power
level increases by 3 dB, the sound
power
value is multiplied by 2. Thus, it is important to notice that a
doubling of the
sound power
is equal to 3 dB, and a doubling
of the sound pressure is equal to 6 dB, since a doubling of
the sound pressure will result in a quadruple increase of the
sound power.
Department of Defense Level
(L
DOD
)
The Average Sound Level calculated in accordance with
Department of Defense Exchange Rate and Threshold Level.
See Average Sound Level.
Table 1
Power form, squared units
Level form
Ratio of Value to Reference
Exponential Form of Ratio
10•Exponent
1
10
0
0
10
10
1
10
100
10
2
20
200
10
2.3
23
1,000
10
3
30
10,000
10
4
40
100,000
10
5
50
1000,000
10
6
60
Table 2
Linear form, non-squared units
Level form
Ratio of Value to Reference
Exponential Form of Ratio
20•Exponent
1
10
0
0
10
10
1
20
100
10
2
40
200
10
2.3
46
1,000
10
3
60
10,000
10
4
80
100,000
10
5
100
1000,000
10
6
120
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