Wagstaff A S, Tvete O, Ludvigsen B
Royal Norwegian Air Force Institute of Aviation Medicine, Oslo, Norway.
Aviat Space Environ Med. 1996 Nov;67(11):1034-8.
Speech intelligibility tests in recorded helicopter noise were performed on 10 subjects with normal hearing, using a Peltor aviation headset. The subjects acted as their own controls, a pair of sunglasses being the only variable factor.
Noise levels were also measured at the tympanic membrane in one of the test subjects for 7 consecutive fittings of the headset, with and without glasses.
Results showed a substantial decrease in speech intelligibility when wearing glasses, being most marked for critical signal-to-noise ratios and the most difficult speech material. Changes were statistically highly significant. Average speech intelligibility scores decreased from 68% to 29% for one-syllable words when wearing glasses at critical signal-to-noise ratios. Noise measurements at the tympanic membrane in one subject showed a low-frequency leakage varying between consecutive fittings.
Our findings show that even small leakages due to fitting of the headset or helmet should be avoided, particularly in noisy aircraft with communication-demanding mission profiles.
使用Peltor航空耳机，对10名听力正常的受试者进行了在录制的直升机噪声环境下的言语可懂度测试。受试者自身作为对照，唯一的可变因素是一副太阳镜。
还对其中一名受试对象在佩戴和不佩戴眼镜的情况下，连续7次佩戴耳机时鼓膜处的噪声水平进行了测量。
结果显示，佩戴眼镜时言语可懂度大幅下降，在临界信噪比和最难的言语材料情况下最为明显。变化在统计学上具有高度显著性。在临界信噪比下佩戴眼镜时，单音节词的平均言语可懂度得分从68%降至29%。对一名受试者鼓膜处的噪声测量显示，连续佩戴时低频泄漏情况有所不同。
我们的研究结果表明，即使是由于耳机或头盔佩戴不当导致的小泄漏也应避免，特别是在执行需要通信的任务且噪声较大的飞机上。
Zotero 插件