Found this photo of a sound experiment conducted at Bell Labs. Their objective seem to be the same. Focus sound energy in one direction. That is a cool looking gadget - did they really have a way to view the sound waves in real-time or a superimposed picture? My guess is the later.
That's a high-tech top notch research institution that invented the transistor! Mine is a back yard workshop on shoe string budget. They are professional scientists, I am a hobbyist & a farmer.
Hope my crude and brute force approach get some results.
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