for example, you’re in a loud train station or in a place with loud tools but you hardly hear anything with noise cancelation. why is this not considered hearing protection?
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The same reason a hat doesn’t protect your head in a motorcycle accident. That’s not the intent of the design. You need a helmet.
If you want to protect your hearing, you need physical cups that go over your ears and actually BLOCKS the sound waves. Noise cancelation can be added on top of it for a better experience. But it isn’t going to do the job by itself. Noise cancelation isn’t a force field.
They actually can protect your hearing, but only in certain situations, and not in others.
They work by producing sound waves that “cancel out” or destructively interfere with the sound from outside. This is very good for steady background noises like a lawnmower or airplane. But really bad for changing or sudden noises like a gunshot loud concert. In the later scenarios the sound generated to cancel out the outside noise is on a slight delay so it might be too late and it might not be able to fully cancel the outside sound.
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