omichalis
Date: Fri Jul 30, 2010 10:33 pm ((PDT))
At first I thought it could be a problem with the mic - but I got several r=
ecordings in a lake after that with no problem at all.
Let aside that in this very occasion I got more recordings without that lou=
d sound in exactly the same conditions..
In an attempt to make a stereo recording of this I slightly repositioned th=
e mics several times but only the first one did I got this strange sound, i=
f it was some sort of malfunction it would also occur on the other recordin=
gs as well - so I think it' s unlikely to be such a problem.
The mic was positioned in the water and buried in the bottom of the sea in =
a depth of 40-60cm or sth like that. The wasves were not directly hitting t=
he mic. The mic was constantly under water.
Nevertheless, I ' ll do several test to check there is nothing wrong with m=
y mics in all cases, and let you know.
There are some military radars within the greater area, but in a distance o=
f several km, if that was the case, the other mic should pick that kinds o=
f sounds I think.
I tend to believe there is something that lives in the sand
(well the thought that there s something wrong with my mic makes me shiver.=
.)
m
On 31 =CE=99=CE=BF=CF=85=CE=BB 2010, at 4:09 =CF=80.=CE=BC., Robb Nichols w=
rote:
> It sounds like a problem in one of your hydrophones. Are waves flooding
> over it? It sounds like you can hear gas bubbles in the recording.
> This loud chirp appears to occur every time a wave rolls over it. It
> could be some kind of pressure settling thing. Can you recreate it by
> dropping it quickly into the water?
>
> On 7/30/2010 5:07 PM, James Shatto wrote:
> >
> >
> > The loud chirp of sorts sounds man made. A radar sweep or something?
> > Near a military base, major airport, or other sources? There's a
> > sound of something digging near the mic, but I don't think it's the
> > source of that other sound. The other one is a bit too metered, a bit
> > too consistent in amplitude. Perhaps one of the hydrophones is more
> > sensitive to it than the other. If you were to do some math on the
> > timestamps and intervals it'd probably show a pattern. A ship at sea
> > riding the waves might account for the minor absence of that at some
> > of the intervals.
> >
> > - James
> >
> > --- On Fri, 7/30/10, Marinos Koutsomichalis <
> > <marinos%40agxivatein.com>> wrote:
> >
> > From: Marinos Koutsomichalis <
> > <marinos%40agxivatein.com>>
> > Subject: [Nature Recordists] what is this creature/sound ?
> > To: "Nature Recordists" <
> > <naturerecordists%40yahoogroups.com>>
> > Date: Friday, July 30, 2010, 12:19 PM
> >
> >
> >
> > I buried a couple of hydrophones into the sand underwater in a remote
> > beach - only one of them picked this sound, so I guess it might be sth
> > living in the sand ??
> >
> > anybody has any clue ??
> >
> > here are the recordings :
> >
> > http://soundcloud.com/marinos/sets/hydrophone-recordings
> >
> > and this is where I recorded it :
> >
> > http://pininthemap.com/d7b2e0bc48ba2e503
> >
> >
> >
> >
> >
>
|