Acoustic Glossary
Sound level parameters
A/C/Z weighting
A: The A weighting curve is based on 40 Phon Fletcher-Munson Equal Loudness
Contour. Suggest to use the A weighting for noise assessment on human beings..
C: The C weighting in essentially is approximate smooth. Suggest using the C
weighting with labor safety concern.
Z: The Z weighting for the electric instrument interior not the linear signal which
processes after the filter, suits in wants to output AC or the DC signal does other
research to use. The Z weighting is a linear signal which is not processed through
the filter. It’s suitable to output AC or DC signal for research.
Test Function
Screen parameter Description
SPL
LAFp
Sound pressure level (SPL)
SPL
LASp
Sound pressure level (SPL)
SPL
LCFp
Sound pressure level (SPL)
SPL
LCSp
Sound pressure level (SPL)
SPL
LZFp
Sound pressure level (SPL)
SPL
LZSp
Sound pressure level (SPL)
Leq
LAFq
Equivalent continuous level for the duration of the
measurement for A weighting
Leq
LCFq
Equivalent continuous level for the duration of the
measurement for C weighting
Leq
LZFq
Equivalent continuous level for the duration of the
measurement for Z weighting
SEL
LAE
Frequency weighted sound exposure level for the
duration of the measuremen for A weighting
SEL
LCE
Frequency weighted sound exposure level for the
duration of the measuremen for C weighting
SEL
LZE
Frequency weighted sound exposure level for the
duration of the measuremen for A weighting
Peak
Lcpeak
Instantaneous C peak level
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