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Re: Introduction...

Subject: Re: Introduction...
From: "Peter Shute" pshute2
Date: Wed Jun 15, 2011 12:39 pm ((PDT))
I don't know much about this stuff, but is it an option to place a micropho=
ne, or several, somewhere in the roost at night with the reasonable hope th=
at one of the subjects will roost close to it?=0D
Surely getting very close would isolate the sounds better than any other op=
tions. Would they be disturbed by a microphone's presence or by cables or r=
emote controlled aiming?=0D
Peter Shute=0D
Sent using BlackBerry=0D
From: =0D
To: =0D
Sent: Thu Jun 16 02:41:58 2011=0D
Subject: [Nature Recordists] Re: Introduction...=0D
> b) allows me to get an averaged=0D
> sound level and frequency distribution spectrum for the 10 minute duratio=
> of the recording (using Raven 1.4); and=0D
Hi Tim,=0D
I would perhaps recommend to use single (calibrated) omni-directional micro=
phone for this kind of analysis. As David already pointed out, summing up t=
he two stereo channels of an ORTF array could lead to odd effects.=0D
> The shotgun mics I have access too (Sennheiser ME66 and ME67) do not seem=
> be able to abstract to this extent. Maybe a better mic (SennheiserMKH8070=
> may achieve this but sadly at the moment it's out of my league.#=0D
No, for your particular application, the more expensive MKH series shotgun =
microphones will not provide any advantage because the pick-up patterns of =
all these models are quite similar. Actually, the MHK series microphones ex=
hibit a higher noise level at frequencies above about 10 kHz, which could b=
e a problem for your spectrographic analysis.=0D
> I must admit to being a little worried about the frequent comments I come=
> across in various areas of the scientific literature regarding supposed=
> "colouration" of the sound by the parabola? Although both reviewing posti=
> on this list, and doing a little research of my own into the published=0D
> literature, this does not seem to be a huge problem providing you are=0D
> concerned with on-axis recordings of above the critical frequency for the=
> dish diameter you are using. Or have I missed the point entirely somewher=
Yes, you are right. There will be some coloration caused by the parabola, b=
ut as you explained, there are no alternatives under these specific circums=
tances. Even a recording made with a shotgun microphone can be affected by =
coloration effects as soon as there are reflections off the ground or nearb=
y vegetation.=0D
> If I understand things correctly, there's no necessarily perfectly correc=
> answer for anything in this game; like in many fields, the answer is usua=
> "it depends."=0D

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