the sound travels through the air, hits the microphone, gets transmitted to a cpu that creates an inverse signal, and is then transmitted to your ears. No matte

the sound travels through the air, hits the microphone, gets transmitted to a cpu that creates an inverse signal, and is then transmitted to your ears. No matter what the cancellation signal is always later than received sound. The received sound arrives first. noises that don't change much have the most similarity between the sound from a couple milliseconds ago to the sound now, and so are most effective. But I will say my sony wf-1000xm3 do seem to do a pretty decent job muffling most noises.