What’s the word on active noise cancellation and hearing protection? I currently avoid using headphones in loud environments, and my quick test is if I can hear myself talk over the music. This page says the active cancellation uses “anti-noise”, which iirc is noise, at frequencies that drown out the outside noise. But I’m not really sure about this. So, if we were in say a 85 db environment, would music with these b…
Noise cancelling earphones really do cancel the noise before you hear it - when they're fast enough. When they work you feel like you're at a quiet room, weirdly hearing only the high-frequency sounds. But yes, you can listen to music at a much lower volume, Safely.
No. They can only start cancel ing it after they build the predictive model of it, and only if the model is accurate. Basically this only works for repetitive regular types of noise (e.g. engine hum).