[MichaelZuo]

Hard to say anything meaningful without knowing more about the state-of-the-art in noise cancellation algorithims.

Which I imagine involves a lot of closely guarded secrets.

[Spooky23]

If they patented, they aren’t closely guarded.

[MichaelZuo]

The techniques needed to actually recreate it is very likely closely guarded, since modern patents can be very vague.