David,
We had a chat with Jean-Marc about this long ago, but I can't find the
message. He claims a 3 dB improvement per additional microphone (which
is maybe why we see between 4 and 8 in modern systems). He has a number
of papers on this issue, deriving from his work on robotic audition. See
http://people.xiph.org/~jm/papers/IROS04_711.pdf and there is a papers
list at http://scholar.google.com/citations?user=l52ospIAAAAJ&hl=en
Thanks
Bruce
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