Michael Dalton <> wrote:
>Additionally, some sources are what are know as "extended sources,"
>an automobile on a nearby street, for example. The result is that the
>sound field falls off much more slowly, such as 1/R, where R is the
>distance to the source.
Indeed, the sound strength from linear sources falls off as 1/R (or 1/D
to signify distance perpendicular to a line, rather than distance from a
single point). However, the example given above of "an automobile"
follows the 1/R-squared law because one automobile is a point source.
Change the example to "a line of constant automobile traffic" and it
fits the 1/D law. Other common examples of natural linear sound
sources are a babbling brook, a murmuring ridgeline, waves on a
shore ... you get the idea.
Good recording,
Randy
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Randolph S. Little <>
111 Berkeley Circle, Basking Ridge, NJ 07920-2009
Phone: (908)221-9173 Fax: (908)630-0871
URL: <http://rsl.home.att.net>
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