Mind Stretchers
Actually I suspect that 4 mikes is enough to establish a
soundfield and am quite sure that 16 would be.
That is for the soundfield impinging on one spot of course.
The four mikes would be four omnis in a spaced tetrahedron,
say 10 inches on a side.
The sixteen would be in groups of four coincident ones at the points of the same tetrahedron.
These would consist of one omni and three figure 8 ones, the three figure
8 ones being pointed up-down, east-west and north-south.
Or, alternatively, four cardioids pointing out from the center
of the tetrahedron.
This would allow computerized localization of
a single sound source generating a sine wave, or
localization of the original and reflections of a
point impulse source. Of course doing this for a whole
orchestra would be an immense and probably somewhat
impractical computer programming job. The accuracy would
decrease at low frequencies of course.
Doug McDonald
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