An active noise cancellation aircraft headset system. A speaker is mounted within each earcup of a headset for receiving and acoustically transducing a composite noise cancellation signal. A microphone is also mounted within each earcup for transducing acoustic pressure within the earcup to a corresponding...http://www.google.fr/patents/US6278786?utm_source=gb-gplus-shareBrevet US6278786 - Active noise cancellation aircraft headset system
