morning (no bikes), exact same location, first with my engine revving
loudly then with my car horn blaring, at 100 metres. (It felt awful
to be making such blaring noise and I imagined other neighbours might
come running, but when I compared the levels against the 2-stroke
bike noise, well, there is just no comparison!!)
Here is a link to the car horn and revving at 100 metres, using
exactly same recording gear, settings, location, as for the bike.
As for 'normal' traffic David, well there is usually none at all, so
very hard to measure, other than my own car revving which hardly even
registered, at 100 metres.
I do have some recordings of several 4-stroke motorbikes riding along
with the 2-stroke bike, so this could be used for comparative
purposes also. The 4-stroke levels are very low in comparison.
Re your comment David, that 'the owner as knocked out the inside of
the silencer', yes it does sound like that to me, I think the bike is
even noisier than regular 2-stroke bikes. Someone suggested it was a
special type of bike used for trick riding. The boy who rides it is
13 years old and he delights in revving it to the max.
More shortly, on Australian noise regulations.
On 26/09/2012, at 11:20 PM, Avocet wrote:
>> My legal advice is that I have 'an entitlement to the quiet
>> 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
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