Acoustic Glossary


Sound and Vibration Terms, Definitions, Units, Measurements ..
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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 A-weighted and was a Fast, Slow or Impulsive Time Weighting used. Already we have introduced several variables for one basic 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. Where appropriate we also include the correct definition.

Listing terms alphabetically means some related terms are spread 'randomly' around the site. We have therefore grouped the Main Topics and Related Terms together. To see this sub-menu click the + sign at the top of any page. If you find any errors or omissions please e-mail us

Sound and Vibration Glossary