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this post was submitted on 21 Sep 2023
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Wait, what? Doesn’t phase cancellation actually cancel the waves? How can it be inaudible but still present?
The waves are canceled (i.e. gone) until something goes wrong. You could end up accidentally causing constructive interference, in which case you my double the sound's amplitude.
I feel like this doesn't happen very often though. I mean I wear sound canceling headphones all the time and I've never noticed it accidentally making anything louder. Then again, I don't normally stand near jet engines.
My noise cancelling headphones make wind noise much louder when it's really windy.