Active Noise Cancellation in Audio Output Device

The audio output device is disclosed. The apparatus applies to the communications interface, the sensing signal to detect the audio signal transmitted via the communication interface, the first level (Active Noise Cancellation) ANC respect to the audio signal to provide a wired or wireless connection to the playback device It includes ANC module, and a control unit which determines the level of the ANC applied by the ANC module to the control section not the audio signal is provided based on the information transmitted from at least one of the communication interface or the signal sensing unit If it is determined that, by causing the ANC module may perform the ANC of the second level. In addition, various embodiments can be identified through the specification.