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Re: speaking of fetch

Subject: Re: speaking of fetch
From: "rock_scallop" rock_scallop
Date: Tue Mar 12, 2013 3:46 pm ((PDT))
Thanks Klaus,
Yes,"transparency" works well in my statement rewritten now as:
I include noise (microphone self-noise and recorder input noise) as a facto=
r in perspective, because it affects the perceived transparency of a sounds=
cape.

This in effect limits the size of the practical area of high resolution sur=
rounding the microphone. The microphone polar paterns and array configurati=
ons affect the shape of this area. What do we call this practical area of h=
igh resolution?

When David first mentioned "fetch" at first I thought that is what he meant=
. Emotionally perhaps,I was thinking of the wind at sea - and the fetch as =
distance or the area over which the wind blows to create an ocean swell. So=
 "fetch" could work well to describe distances and area of soundscape recor=
ding.

John Hartog


--- In  Klas Strandberg <> wrot=
e:
>
> John, I think I usually use "transparency" for what you mean. I then
> mean a combination of stereo picture and low noise.
> In my experience, microphones have different "transparencies"
> depending on the sound. Usually, I find a low noise M/S to be most
> transparent, but not always.
> This is difficult to talk about, as most of us do not only mean
> different things with words, but also have different emotional logics
> about it.
>
> Klas
>
>
> At 18:14 2013-03-12, you wrote:
> >David,
> >I finally understand what you mean by fetch now:)
> >It is not how I would use the term, but fine.
> >I include noise as a factor in perspective, because it affects the
> >perceived soundscape, but that is also just me.
> >
> >John Hartog
> >
> >--- In  "Avocet" <brini@> wrote:
> > >
> > > John,
> > >
> > > Apologies for labouring the point again but "fetch" is all about
> > > acoustic perspective, not noise.
> > >
> > > > narrow angled stereo using two cardioid Rode NT1A's with self-noise
> > > > of 5dB;
> > >
> > > No useable mic has an excess noise over thermal of 5dB. This figure i=
s
> > > claimed as a world record by B&K for one of their special
> > > instrumentation mics.
> > >
> > > Ill-defined noise figures are misleading. Sennheiser quote around 23d=
B
> > > ITU-R468 weighting which many other mics can't get near.
> > >
> > > I'd take the mic hiss down using my algorithm on Audacity unless it
> > > sounded like part of the soundscape.
> > >
> > > Now for the wildlife answer. :-)
> > >
> > > > Let's say we are recording from the center of a meadow surrounded b=
y
> > > > trees and it is dawn on a spring morning and we are interested in a
> > > > particular sound we can faintly hear in the distance.
> > >
> > > What you don't quote is the acoustic background noise in the setup
> > > like tree noise. Unless it is considerably lower than the faint sound=
,
> > > you won't get much anyway. If it is faint to the ears, it will be
> > > fainter to any mic.
> > >
> > > None of this is what you are asking - so -
> > >
> > > If the sound is faint to the ears it will be fainter to any mic rig.
> > > What a good fetch gives is a closer perspective against the ambient
> > > sounds and reverberation - if that is what the recordist wants.
> > >
> > > What I would do is to listen to all three rigs and choose what sounds
> > > best. I would probably choose the Jeklin simply because it used
> > > Sennheiser mics which would survive rain. :-) Second would be the
> > > crossed cardioids which will have a similar perspective at bird
> > > frequencies, and avoid the hypercardiod with its annoying rear lobe
> > > picking up tree noise from the rear. Two with two rear lobes would be
> > > needed for stereo of course. If I could baffle off the rear
> > > lobes, it may be useable, but the only hope of getting a "specimen"
> > > recording would be with a rifle mic like the MKH-816 in mono.
> > >
> > > The intervening trees would probably disperse the call. I spent a
> > > summer trying to get a clean woodpecker drumming in my woodland on 15=
0
> > > metre cables. I could fetch it in at a reasonable level with rifle
> > > mics, but the reverb from the trees muddled the drumming. I got the
> > > blighter last year when it drummed on a tree across my car park at 60
> > > metres using the fetch of my 416's.
> > > http://www.stowford.org/recordings.htm#woodpeckerbeech
> > >
> > > David
> > >
> > > 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
> email: 
> website: www.telinga.com
>
>
>








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