I have absolutely no knowledge about this domain, so this idea 1) might not be viable and 2) is not a full developed product idea - but I thought it would be fu

I have absolutely no knowledge about this domain, so this idea 1) might not be viable and 2) is not a full developed product idea - but I thought it would be fun to get your thoughts. Could you put some sound sensors inside of some mechanical structure and use the acoustics to figure out where some physical contact is happening on the outside of the structure? Specific Application: prosthetics devices that can - with only a few acoustic sensors - determine where the 'touch' was on the outside of the device. If viable, it may be similarly useful for robots - or any machine in general - that needs a low-hardware (and thus low cost) method of getting course tactile information around it's boundary.