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Estimating Sound propagation  Daniel J. Alberts
 Jun 15, 2005 11:45 PDT 


This web site provides a rough first estimate of outdoor sound attenuation
based on ISO 9613.


For example, at 20 C, and 77% humidity, a Concert A (440 Hz) will reduce in
volume 2.3 dB per kilometer. A low frequency sound (200 Hz) will reduce only
.8 dB per km.

Of course, this doesn't take into account sound absorbed by trees or
reflected by buildings. But it gives a good 'first estimate'.


Daniel Alberts
Lawrence Tech's Wind Energy Delphi
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