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comparing this with hawkeye is pointless since the technologies have nothing in common. That's like saying "sandwich you're eating can misfire because rifles do all the time", makes no sense. Sounds that travel within a solid medium have orders of magnitude higher ampltiude than those traveling through air, if you pick them up with a microphone directly in contact with the said solid. If you hit the stand holding a mic it will peak like crazy, never in a million years would it produce a false positive. Every bounce of the ball will produce a spike and that's about it, you simply observe if there's a spike at the moment when the ball passes the edge, that simple. Hawkeye's error is due to the camera resolution being limited and visual recognition techniques having statistical nature, none of that is present when you're dealing with sound.
If the ball hits the side vs the top of the table, is there a distinction in the sound values as well?