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Re: Regulation & Road Noise (fwd)
In a message dated 97-09-29 10:38:28 EDT, Federico writes:
<< > The criterion "beyond 30 ft the sound should disappear" has little
> meaning without a number behind it. Should it be less than 10% of the
> ambient? in sound pressure? in energy? Numbers are needed to give
< flesh to criteria for a quieter and more pleasant environment.
Depending on frequency and sound pressure level, psychoacoustic
masking effects begin to be noticeable (that is, a sound becomes
inaudible in the presence of another one) when the sound presure
level goes some 20 dB below the masking sound. Of course this
is a rough criterion, because a high-pitched tone won't mask a
low-pitched one at all, almost regardless of its sound pressure
What I am looking for is something simple, practical, and
easy to enforce. We cannot expect the police to be acoustic
engineers or audiologists.
It they can hear an auto stereo from a distance of 30 feet,
then so can I. I don't want to hear it. They should be
empowered to write a ticket if they can hear the noise
30 feet from the source.
Does it have to be any more complicated than that?
-- Michael Wright
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