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146
Appendix B
Taktmx
A time average over a sampling interval that uses the highest level occurring during the
preceding Taktmaximal Interval, either three or five seconds, and assumes that it was
present for the whole Taktmaximal Interval.
Third-octave band
A Third-octave band is defined as a frequency band whose upper band- edge frequency is
1.26 times the lower band frequency.
Threshold
An SPL value that defines a lower level of acceptable values. Only SPL samples that exceed
the threshold are used in some calculations.
TWA
Time weighted average. The constant SPL over an 8-hour interval that would produce the
same exposure to sound as an exposure measured over a run time sampling interval (Rtime).
⁄
RTIM E
∫
L ER
(
)
TWA
=
ER
log
2
t d
–
log
CT
dB
2
2
0
Upper Limit (UL)
The total time during a study that the SPL exceeds the Upper Limit meter setting.
Models SE and DL
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