Comment by metalman

its called a noise gate: basic audio gear that triggers a function based on SPL(sound pressure level),which would be a reliable way to trigger a capture event and....the rest, without listening to everything.Change in tempo and pitch could also be good for an "event trigger". the start of digital audio goes back to the 1980's and the full suite of capabilities is trivial for any phone, as they are integrated extensivly to cancel background noise anyway. And with so called digital voice assistants running, I cant be surprised. My main point would be that ,everyone is convinced that there phones are spying on them, its one more thing to make them flinch and grimace, argueing about it will only draw deeper lines.And that, is where we are.