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Selective active noise cancellation based on directional reference signals

Active noise control (ANC) technologies have been successfully applied in headphones to cancel the sound that propagates into one’s ear canal from outside. However, the standard ANC systems would attenuate the sound from all the sound sources blindly ignoring that a listener may prefer to listen to some of them. This paper proposes a feed-forward ANC system for ear-level applications, which is capable of preserving the sound of a source in any given direction relative to a listener while attenuating the sound in other directions. The selective cancellation is achieved based on the creation of appropriate reference signals from the output of a microphone array wore on user’s head. Theoretical analysis and simulation results will be presented to demonstrate the potential benefit and limitations of such a system.