Appendix 3: description sound levels, Appendix appendix 3: description sound levels – NTi Audio XL2 Sound Level Meter User Manual

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Appendix

Appendix 3: Description Sound Levels

A-Frequency Weighting Filter in accordance with
IEC 61672

Applicable for most common sound pressure level
measurements, compensating for human hearing
perception at lower sound pressure levels.

C-Frequency Weighting Filter in accordance with
IEC 61672

Applicable for very high sound pressure levels,
compensating for human hearing perception at
high sound pressure levels; typically used for mea-
surements of peak values, e.g., LCpeak

Capture

This selection offers the reference curve, which has
been previously stored with Capture in the spec-
trum analyzer of the SLMeter function.
Application example:

Comparing the performance of the left and right

speakers in a live event sound setup.

Sound Exposure Level

The sound exposure level LAE is the LAeq normal-

ized to 1 second. The sound exposure level is mea-
sured to compare noise events with different time
durations. The LAE reports the amount of noise

from an event such as an individual aircraft fly-over.
LAE = LAeq + 10 x log (time in seconds)

Time-Average Sound Level or
Equivalent Continuous Sound Level in accor-
dance with IEC 61672

Moving Time-Average Sound Level or
Moving Equivalent Continuous Sound Level

with selectable time window from five seconds up
to one hour. Four individual levels can be config-
ured. The moving time-average sound level is an
Leq based on a moving time window.

Sample:

10h 00min 00sec Start of XL2 measurement

10h 00min 05sec Leq5” = Leq of this 5 seconds

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