DIY Acoustic Camera
I'm not the original author, however, ages ago I invented what's now being called "acoustic camera".  (Specifically, the SOTA on the math side for precision, accuracy.)The resolution is fine enough that with COTS parts, I can record my signature simply by sketching it out with my fingernail on a table.Every few years I dust this off and play with it, wondering if there's some application or other way to "turn this into money" (an increasing concern in the coming months...PLZ HIRE ME), but I'm not a "product guy".I'll answer some questions about the technology, but would really love to know if anyone here has advice on somehow using this achievement to pay rent.  :)