Definitions, Terms, Units and Parameters
The world of acoustics is overflowing with terms and parameters. For example; Lmax is often used to describe the maximum sound level, but was the measurement
and was a Fast, Slow or Impulsive
Time Constant used. Already we have introduced several variables for one simple measurement, without mentioning the measurement duration.
To describe any A-weighted, Fast Time Constant, Maximum measurements, correctly, we should use the form LAFmax
. However in the real world many people continue to use the 'simple' Lmax
. Similarly the terms LA
= 90 dB, 90 dBA or 90 dB(A) are often used to describe the same measured value.
This glossary is for visitors and customers who come across a term they do not know, or are not sure about. If a term is not strictly correct we do not go into great detail explaining where it differs from the strict convention, we just say what the term 'means' in the practical world. However where appropriate we include the correct definition. If you find any errors or omissions please
Some parameters need more detailed descriptions so we provide links throughout these pages and a
Listing terms alphabetically means some related terms are spread 'randomly' around the site, so we have also grouped some Main Topics and Related Terms
together. To see these groups click the +
sign on any page.
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