I've found that my iPhone does a fairly decent job of discerning my voice in a noisy environment. I suspect that there is lots of clever use of noise cancelling

I've found that my iPhone does a fairly decent job of discerning my voice in a noisy environment. I suspect that there is lots of clever use of noise cancelling mics to distinguish between a nearby voice issuing commands (mine), and noise in the environment. It would be an interesting experiment.