The best active headsets are exceptional at this specific range. They permit the communications audio signals from radios and intercom to be intelligible at reduced volume levels. With ANC systems, you will turn down your audio signal because you can understand ATC much better. Stress and fatigue Noise clearly has the capability of producing stress and fatigue. However, measuring and quantifying these effects on the pilot has proved difficult.
Stress is colored by previous experiences, conditioning, and the character of the noise itself.
Higher frequency sounds are generally more disturbing and higher pitched sounds are often associated with danger. One obvious aspect of stress levels is the perceived loudness of the sound. Loud sounds are more stressful than ones of similar character but quieter. Vibration and lower frequency sounds produce fatigue and influence our ability to focus. Long-term exposure to aircraft noise not only can produce fatigue but may also lead to mental errors.