this post was submitted on 26 May 2024
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The active, in active noise cancelling means listening by using microphones then playing the exact inverse of the heard sound to cancel the noise, actively. Opposed to passive, which tries to restrict noise like ear protection by enclosing an ear and adding insulation against noise from getting in.
So no, not white noise, though that'll sometimes be generated too. You'll realise quickly most active noise cancelling headphones only listen on the microphones on specific frequencies which is why different settings can allow sound through.