Definition
A method used in aviation headsets that cancels unwanted cockpit noise by electronically generating a sound wave equal in amplitude but opposite in phase to the incoming noise. When the two waves combine, they cancel, leaving the pilot's ears with significantly reduced ambient noise so radio calls, intercom audio, and warnings come through more clearly.
Plain English
A headset feature that listens to the loud background noise around you and plays an opposite sound to cancel it out, so your ears hear far less engine and wind noise.
Context Anchor
Seen in aviation headset descriptions, cockpit equipment checks, and pilot discussions about hearing protection and radio clarity.
Derivation
From Latin activus (acting, in motion) and reducere (to lead back, diminish). 'Active' here means the system is doing something — generating its own counter-sound — rather than just blocking noise with padding (which would be 'passive' reduction).
Why Pilots Care
Long flights in noisy cockpits cause fatigue and hearing damage. A headset with active noise reduction lowers that fatigue, protects hearing, and makes radio communication easier to understand — which is a real safety benefit.
Analogy
It works like noise-cancelling headphones used by airline passengers: the headset listens to the unwanted background sound and adds a cancelling sound to reduce what reaches your ears.
Intuition Check
Active does not mean the headset is simply switched on. Here it means the headset uses powered electronics to cancel part of the noise.
Example Sentence 1
Most modern aviation headsets use active noise reduction to make engine drone less tiring on long cross-country flights.
Example Sentence 2
Active noise reduction allows clearer radio communication during long cross-country flights in noisy piston aircraft.