Passive HPDs


Passive HPDs (Headphone Personal Devices) are electronic devices that do not emit any sound or noise-cancelling signals, but instead rely on their physical design to reduce the amount of external noise that reaches the user's ears. In aviation, passive HPDs are commonly used by pilots and other crew members to reduce the impact of engine noise and other ambient sounds on their hearing. Passive HPDs can be designed as earplugs, earmuffs, or other forms of hearing protection, and are typically made from materials that absorb or reflect sound waves. While passive HPDs are generally less effective than active noise-cancelling devices, they are often preferred in aviation due to their simplicity, reliability, and low cost.


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