there is a bunch of iso standards for measuring acoustical things at
http://www.iso.ch/cate/1714001.html
some examples are
sound absorption in reverberent room
method for calculating loudness level
method for calculating attenuation of sound during propagation outdoors
detemination of sound insulation performance of cabins
but they are not freely available over the net - you have to order them
and pay for them ...
stephen
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