ABSTRACT
Noise-canceling headphones are a great tool for reducing the consequences of constant exposure to loud sounds, such as those experienced by private pilots in single engine aircraft. Noise-canceling headphones work by using a microphone to detect ambient sounds, and then using electronics in the ear piece to generate noise-canceling waves that are 180° out of phase with the ambient noise waves, effectively “erasing” the ambient sounds. Components striking or rubbing against each other, vibrating components, pressurized gas escaping through a nozzle, and cooling fans commonly cause loud sounds that can damage hearing over time. If a product can generate loud sounds ≥ 85 decibels, which can cause temporary or permanent hearing loss or cause severe discomfort, it should incorporate volume-limiting features. The US Occupational Safety and Health Administration has established guidelines for occupational noise exposure.
