What is Active Noise Cancellation

Active noise cancellation is a technology designed to reduce unwanted ambient sounds by using a microphone to pick up the sound, analyzing it, and then generating a sound wave that is the exact negative of the unwanted noise. As pilots, active noise cancellation technology can significantly reduce cabin noise, protect hearing, and extend our professional life.

How does Active Noise Cancellation Work?

Active noise cancellation works by using a microphone to capture the sound waves in the environment. These sound waves are then analyzed by a processor, which generates a sound wave that is the exact opposite (180 degrees out of phase) of the unwanted noise. When these two sound waves combine, they cancel each other out, effectively reducing the overall noise level.

Limitations of Active Noise Cancellation

While active noise cancellation is highly effective at reducing constant, low-frequency sounds like the hum of an airplane engine, it may not be as effective at blocking out sudden, high-frequency noises. Additionally, active noise cancellation can sometimes introduce a slight hissing sound, known as "noise-cancelling hiss," which may be noticeable in quieter environments.