oh wow, this is like an RF Circulator - <a href="https://en.wikipedia.org/wiki/Circulator" rel="nofollow">https://en.wikipedia.org/wiki/Circulator</a> - which are wacky enough in themselves.
I’d love to understand, in a real world test, if the modified sounds waves would then bounce off nearby walls and end up echoing back anyway, thus nullifying any utility of the discovery.