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Re: measuring noise levels - help needed

Subject: Re: measuring noise levels - help needed
From: "Klas Strandberg" klasstrandberg
Date: Wed Sep 26, 2012 9:05 am ((PDT))
Vicky, I think your claim is perfectly just.

There are limits in Sweden for how loud a motor bike can be and the
Swedish police has the proper equipment to measure and the training
how to use it.
Still, when i Harley owner (! only) wants his bike to be loud, the
police cannot do anything. 1/ The driver claims that the bike is
broken and that he is heading for the nearest garage to fix it, 2/
the driver demands to have the decibel meter calibrated on the spot,
3/ the driver claims that the policeman holds the measuring equipment
in a wrong way... e.t.c.
The laws don't work.

Another way is to measure as we measure neighbors partying: How OFTEN
and for how LONG.
If a person has too long parties, too often, it doesn't need to be
very loud. The landlord will give him a few warnings, after that he
will be forced to move.

My own case is the parachute jumpers. They have a strip about 20
miles from here and I can hear the plane just after take off. They
have two planes.
Every fine day between end of march till end of October, is filled
with sounds from one of these airplanes about 70% of the time between
8 am and 8 pm, weekdays and Sundays. The 30% off is when the pilots
are having lunch and coffee.
It's not very loud! Also, they claim that they have bought low noise
turbojets and run them only to 70%. Which is true. But it doesn't
help. The sound is there, all the time, more or less, unless it is
windy or rainy and nobody want to relax in the garden anyway.

Before the parachute club, this was an area which was about 90%
intermittently quiet, that means, you could hear a distant train for
30 seconds, then quiet for seven minutes, then a distant truck for 10
sec, e.t.c.

So what can be done? Nothing, as far as I see it. "We" don't have the
arguments and the awareness needed.

If there is interest to start a movement focusing on "time and how
often" please get in touch.

If you need a decibel meter, Vicky, I would be happy to lend you
mine, but I doubt that it is "properly calibrated" or something.


At 15:20 2012-09-26, you wrote:
> > My legal advice is that I have 'an entitlement to the quiet
> > enjoyment
> > of my property' and that the 2-stroke motorbike noise constitutes 'a
> > legal nuisance'.
>To quote a noise level legally you need a calibrated sound level meter
>and accurate distance measuremnts. Motorbikes in particular are
>difficult to pin down legally.
>I had a listen to your recording, and it sounds as if the owner has
>knocked out the inside of the silencer in order to make more noise. It
>has a typical rasping noise which moronic riders enjoy. If the
>silencer has been damaged, this is grounds for a complaint and a
>possible prosecution.
>However, to reproduce a nuisance, what you need to do is to get
>comparison recordings, preferably from your property, of normal
>traffic and the motorbike, preferbly in a single recording session.
>You will need to note the recording details, especially the mic and
>level setting and avoid any form of compression or level control by
>peaking well below maximumm. If you can, do without a bass cut in
>spite of my previous advice. :-) You can then submit a direct
>comparicon of the motorbike noise as compared with "normal" traffic.
>If you are not making a case for exceeding a legal noise limit, an
>edited track should be acceptable, especially if you have your own
>"standard" noise (your car horn?) which can establish a common level
>across the edit.
>As for decibel levels, you can read off peak levels from acceptable
>and unacceptable noises like the bad motorbike compared with a
>similoar unmodified model or other motorbikes. What could be useful is
>comparing the noisy one with normal motorbikes. Just keep the peaks
>well short of clipping.
>David Brinicombe
>North Devon, UK
>Cogito cogito ergo cogito sum - Ambrose Bierce
>"While a picture is worth a thousand words, a
>sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
>Yahoo! Groups Links
Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01

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