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 perceive=
d soundscape, but that is also just me.
John Hartog
--- In "Avocet" <> 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 is
> claimed as a world record by B&K for one of their special
> instrumentation mics.
>
> Ill-defined noise figures are misleading. Sennheiser quote around 23dB
> 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 by
> > 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 150
> 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
>
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