Well, in a way it is correct too, but not completely. The closed acoustic system and the earbuds which fit right between the inner lobes of the ear can cause noise to reduce. But noise cancellation is a different attribute and functionality altogether. The closed acoustic system does not allow the noise that an open system does, that’s it. Complete noise cancellation happens through a microphone technology that is present in the earphone. Further, an acoustic system determines the sound quality and clarity.