See the conversation. Read the following conversation: --What is meant by noise-cancelling headphones?. --Noise-cancelling headphones  Noise-cancelling headphones, or noise-canceling headphones, are headphones that reduce unwanted ambient sounds using active noise control.. --how do they reduce unwanted ambient sounds. --This is distinct from passive headphones which, if they reduce ambient sounds at all, use techniques such as soundproofing.. --what else can you tell me about them. --
Noise cancellation makes it possible to listen to audio content without raising the volume excessively.