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correlation btw 2 singals incoming two ears from distributed souces

Dear all,

I am working on the speech stuff, recognition and enhancement.
While using two signals with two microphones moderate distance apart,
say a few tens of centimeters.
I assume there is one speech source,
and distributed noise sources all around a room
instead of a point-source.
( and also assume additive noise. )

Is there publication on the correlation of two signals
incoming into two mics,
when there are distributed noise sources around.

and is there any way to simulate this situation?

Any comments and references will be appreciated.

Thank you.