eli5 Noise cancelling headphones are magical but how does the technology work and does it drain the battery?
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Does noise cancelling technology actually protect against hearing damage, or just give you the *illusion* of less sound reaching your ears?
Air pressure variations can be positive or negative, meaning they can either be higher-than-normal pressure or lower-than-normal pressure. Most sounds are actually a very quick oscillation back and forth between high and low pressure.
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