Electronic device having active noise control with an external sensor

A system for actively reducing noise of an electronic device comprising an enclosure having a duct extending from an interior to an exterior of the enclosure to exhaust airflow from the enclosure, the system comprising:

• an internal sensor arranged to sense a noise and generate an internal sensor output;
• an external sensor arranged outside of the enclosure to detect sounds and generate an external sensor output;
• and
• an acoustic wave generator to generate an acoustic wave within the duct to reduce the noise based on the internal sensor output and the external sensor output,
• wherein the acoustic wave generator is to at least partially power down one or more components of the active noise control mechanism based on a determination that an amplitude of the sounds detected by the external sensor exceeds a sound amplitude threshold.

A method comprising:

• using a duct connected from an interior to an exterior of a device enclosure to exhaust airflow from the enclosure;
• detecting sounds with an external sensor arranged outside of the device enclosure;
• detecting a noise within the duct;
• and
• generating, using an active noise control mechanism, an acoustic wave to reduce the noise in response to the detection of sounds with the external sensor and the detection of a noise within the duct,
• at least partially powering down one or more components of the active noise control mechanism in response to a determination that an amplitude of the sounds detected by the external sensor exceeds a sound amplitude threshold.