It's a question I've been working on.
I want to put a whole bunch of small microphones together on a flat surface to see if I can create a sonar image by bouncing a single sound off of an object, and recording when each mic hears it.
I think I've got a fast enough processor on my reader to take down that data, but how to go about the little microphones is kind of scary..... They don't need to be very sensitive in terms of sound quality, since I only want them to listen for the one sound and report back when they hear it, but they do have to be able to accurately detect that sound.
Any input would be appreciated, but I know it's kind of a crazy request, so I don't have any wild eyed hopes.