eli5 Noise cancelling headphones are magical but how does the technology work and does it drain the battery?

Question

eli5 Noise cancelling headphones are magical but how does the technology work and does it drain the battery?

In: 341

Answer 1

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.