A microphone is using so little electricity / voltage that I’d be surprised if you can detect anything even right beside it. It’s also not going to be tied to any fingerprint you’re trying to transmit.
And also do be doing positioning requires multiple spatially separated receivers (nothing like LIDAR). And good luck separating out other much larger sources of EM noise.
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Perhaps they could do the audio+EM equivalent of LIDAR - put out a high frequency audio signal and than listen for EMF that matches.
A microphone is using so little electricity / voltage that I’d be surprised if you can detect anything even right beside it. It’s also not going to be tied to any fingerprint you’re trying to transmit.
And also do be doing positioning requires multiple spatially separated receivers (nothing like LIDAR). And good luck separating out other much larger sources of EM noise.