I was curious about this too. My EE (particularly RF) studies didn't go far enough for me to chime in. Is there power circuitry, etc that could likely (a) gene

I was curious about this too. My EE (particularly RF) studies didn't go far enough for me to chime in. Is there power circuitry, etc that could likely (a) generate inaudible frequencies that overlap with mass-market microphone capability & (b) would be sufficiently controllable (albeit likely indirectly) for data transfer?