At 8:30 PM -0700 6/15/04, <> wrote:
> > my old idea of mounting 4 mics in a tetrahedral (pyramid shape)
>
>Kevin,
>
>Such a system was invented and patented by Michael Gerzon and Peter Craven
>back in the early 1970s, and the microphone is now known as the Soundfield
>microphone:
>http://www.soundfieldusa.com/
>The patent is no longer in force.
>
>It was demonstrated by Gerzon that a tetrahedral array of loudspeakers is
>NOT the best way to reproduce the signals. Although the microphone captur=
es
>information that includes height information, the height information is
>almost never reproduced (unfortunately). For practical reasons almost all
>reproduction systems involve a horizontal circle of loudspeakers, say 6 or
>8, or even more.
>
>I have used a Soundfield microphone, either the commercial one or one
>assembled out of individual microphones, to make numerous nature recording=
s
>and I find it very satisfactory for my purposes. But it is not without
>flaws. A great deal more information can be found at:
>http://www.ambisonic.net/
>and in the more than 100 technical papers on the subject published in the
>Journal of the Audio Engineering Society, and elsewhere.
>
>Eric Benjamin
Enjoyed this discussion. The below website has quite a few 5.1 micing
diagrams including the soundfield:
http://www.mtsu.edu/~dsmitche/rim456/Materials/tracking_5_1.html
Rob D.
=3D =3D =3D
--
Rob Danielson
Film Department
University of Wisconsin-Milwaukee
________________________________________________________________________
________________________________________________________________________
"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
Klas Strandberg
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