[asfarley]

I was under the impression that the core principles of noise cancellation were well-understood and in the public domain as part of signal processing. Basically you reverse the predictable component of the signal and add it to the incoming, so only the innovation (unpredictable) signal remains.

Couldn’t Apple or Bose just fall back on these methods which should work closely enough to whatever fancy method is patented? Or is the method I’m describing patented?