I’m not sure it’s the same phenomena though. Since Active noise canceling technology works by emitting "opposite" frequency of what the mic just listened, its

I’m not sure it’s the same phenomena though. Since Active noise canceling technology works by emitting "opposite" frequency of what the mic just listened, its limited by the processing delay so it is only really efficient in filtering sounds that are constant in time. Turns out most sounds you’d want to filter are meeting this criteria so that’s ok. But for sounds that aren’t constant like voices it still works but less. So it’s not a surprise that the technology helps you isolate voices.