Hi Mike,
Wondering if shadows and reflections from shifting wave faces have somethin=
g to do with the tone oscillations.
John Hartog
--- In "picnet2" <> wrote:
>
> Hi,
>
> Heres a couple of short clips that demonstrate the swooshing for the loca=
tion I recorded in. - Since both rigs captured a similar effect, Id put thi=
s down to mic placement.
>
> Google map: http://tinyurl.com/nu9f7l
>
> Rode NT4 about 1ft above water - as the wave approaches the tone of the n=
oise changes.
>
> (Diffuse EQ)
>
> http://urlme.net/audio/swoosh-nt4-diff.mp3
>
> No eq:
>
> http://urlme.net/audio/nt4-swoosh-noeq.mp3
> (noeq=3D cropping to the section and compressing to mp3)
>
> And similar but not the same time from the Binaural Head:-
>
> http://urlme.net/audio/downtobeachswooshing.mp3
>
> Photo of the head "on location"
>
> http://urlme.net/audio/hv4onlocation.jpg
>
> ---
>
> Curt was there a sand bank or rise behind you?
>
> I'll process a video which also demonstrates this effect - video camera w=
as placed on top of the dummy head while I panned it around. Should be on y=
outube just as soon as I find the relevant files.
>
> I would imagine in such a diffuse pink noise environment a pair of figure=
8's may work better?
>
> BR,
> Mike.
>
>
> --- In Rob Danielson <type@> wrote:
> >
> > Hi Curt--
> > I'm trying to narrow down what you mean by "hollow." By comparing
> > files that exhibit the problem with those that don't (or don't as
> > much), we'll all probably learn something. I'm wondering if micing
> > distance and array used are the only other variables we'd need to
> > know,.. Rob D.
> >
> >
> > At 10:08 PM -0500 7/13/09, Curt Olson wrote:
> > >I just got back from a long day of serious trial and error in
> > >attempting to understand some of the main issues with recording
> > >shoreline sounds. I have several hours of audio to study, but here are
> > >my two biggest "takeaway" impressions from the day:
> > >
> > >1) It's been said on this list that mic placement is pretty much
> > >everything. That's for sure!
> > >
> > >2) In rocky surroundings, omnis are much more likely than cardioids to
> > >produce the "hollow" sound I was concerned about.
> > >
> > >This may be old hat to many of you, but it's all new to me, and very
> > >educational. Hopefully I can post a clip or two in the next couple day=
s.
> > >
> > >Curt Olson
> > >
> > >On Jul 13, 2009, at 3:24 AM,
> > ><naturerecordists%40yahoogroups.com>=
s.com
> > >wrote:
> > >
> > >> 3b. Re: Ocean soundscape, two minutes in the Algarve.
> > >> Posted by: "picnet2" <yg%40urlme.net>yg@ picnet2
> > >> Date: Sun Jul 12, 2009 3:06 pm ((PDT))
> > >>
> > >> Hello Curt,
> > >> Ive found that very close produces a tonal change to the noise
> > >> which sounds like a swooshing as the wave approaches. I have over 2
> > >> hours of material, some of it is a walk towards the shore and away.
> > >> Plus close and *really* close as the head fell in the sea - which
> > >> only lasts for 10 seconds until I realized and quickly picked it up=
,
> > >> good job the capsules were water resistant. Gave a whole new meanin=
g
> > >> to close micing. I actually liked the sound when the head was
> > >> perhaps 1 ft above the waves, walking the shoreline and altering it=
s
> > >> position from close to around 6ft above the waves gave a nice
> > >> effect. Also turning it as the wave passes by / tracking the wave -
> > >> a wet feet affair but well worth it. From around 50 ft the sound is
> > >> wider with less sploshing bass from the waves, the capsules Im usin=
g
> > >> do not seem to pickup the roar associated with some recordings ive
> > >> heard, but this is most likely related to different environments. I
> > >> also used a prototype hydrophone to capture the same waves (at
> > >> different times) for the "under" part of my project (Algarve under
> > >> and above)
> > >>
> > >> I suspect one issue causing the hollow sound is due to my diy wind
> > >> protectors, those tend to cause a peak around 6khz since they act
> > >> like leaky Helmholtz resonators. When Im back home I'll EQ the
> > >> recordings. I have some material without the ear muffs in place but
> > >> sadly not very much due to the windy conditions. After a week on th=
e
> > >> beach the cycle seems to go from inland wind to wind from the land
> > >> back to the sea, theres perhaps half an hour between the change ove=
r
> > >> or temperature inversion thats going on (=3Dstill air) before the c=
ity
> > >> heat heads out to sea or perhaps its the wind simply changing
> > >> direction - in either case that window is easy to miss, but good to
> > >> look out for if faced with similar conditions.
> > >>
> > >> Its my last day here, I'd be very interested if you find out what i=
s
> > >> the main cause of the hollow or noise tonality change. For the
> > >> linked recording I actually changed from over the ear to in-ear
> > >> headphones trying to judge the correct head position but after some
> > >> time it seems my ears became accustomed to the sound.
> > >> The recording wasnt actually EQ'ed the pinna response may also be
> > >> one reason for the sound?
> > >>
> > >> I still suspect something based on Rob's sphere rigs(TM) would of
> > >> done a far better job, if you have something similar or can borrow =
a
> > >> bowling ball complete with a mic thread ready to mount on a
> > >> tripod :) it would be nice to hear the lake recorded with a sphere
> > >> setup.
> > >>
> > >> A curved perspex head shape with a large acoustic foam baffle behin=
d
> > >> will be my next rig in the array a day department.
> > > >
> > >> Kind Regards,
> > >> Mike.
> > >>
> > >> --- In
> > >><naturerecordists%40yahoogroups.com>=
ps.com,
> > >>Curt Olson <cro@> wrote:
> > >>>
> > >>> Thanks for posting this, Mike.
> > >>>
> > >>> Very nice tonal balance. Sweet in many ways, but... I hear a
> > >>> certain "hollow" quality to it that's almost identical to my own
> > >>> recent recordings on Lake Superior. I can't put my finger on
> > >>> exactly what's going on. It might be as simple as being to close t=
o
> > >>> the waves, but I don't know for sure. I'm going back up to Lake
> > >>> Superior tomorrow with several different mic rigs to see if I can
> > >>> get an insight into the problem.
> > >>>
> > >>> Curt Olson
> > >>>
> > >>> Mike wrote:
> > >>>
> > >>>> Hi,
> > >>>> Heres a sample recorded with a dummy head placed close to the
> > >>>> waves.
> > >>>> Recorded on Monte Gordo Beach Portugal / Algarve at 10 PM.
> > >>>> This is cropped from a longer recording and has not been equalize=
d
> > >>>> or post processed besides the compression.
> > >>>>
> > >>>>
> > >>>><http://urlme.net/audio/twominutesinthealgarve.ogg>http://urlme.net=
/audio/twominutesinthealgarve.ogg
> > >>>>
> > >>>> Apologies for the ogg format, no mp3 encoder here.
> > >>>> Audacity or vlc (videolan.org) should be capable of playing the
> > >>>> clip.
> > >>>>
> > >>>> BR,
> > >>>> Mike.
> > >
> > >
> > >
> >
> >
> > --
> >
> >
> >
>
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause
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