One of the landmark patent for the Apple AirPods (Pro). "System and method of mixing accelerometer and microphone signals to improve voice quality in a mobile device" One of the ambient sound neutralizing systems from 2016. http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=2&f=G&l=50&co1=AND&d=PTXT&s1=9,363,596&OS=9,363,596&RS=9,363,596 … https://twitter.com/BrianRoemmele/status/1180654833650421765 …pic.twitter.com/Mjb2klgktW