average sound pressure level

Download Acoustical Society of America Standards

Of several related sound pressure levels measured at different positions or different times, or both, in a specified frequency band, ten times the common logarithm of the arithmetic mean of the squared pressure ratios from which the individual level were derived.
Source: http://www.owenscorning.com/around/sound/glossary.asp

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Download IEC standards, International Electrotechnical Commission standards.

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