Lindeman H E
Audiology. 1976 Jul-Aug;15(4):348-56. doi: 10.3109/00206097609071794.
On theoretical grounds, it is usually assumed that the use of hearing protectors in a noisy working environment has no influence upon speech intelligibility - in fact, may even increase it. In practice, however, people often do not wear hearing protectors, since these are widely believed to reduce speech intelligibility. In the present article, a description is given of an investigation, carried out among 537 subjects, into the influence of hearing protectors upon the speech intelligibility of people suffering from noise-induced hearing loss. From this analysis, it has become clear that the use of ear-muffs only leads to an improvement in speech intelligibility in persons who, according to their pure-tone audiogram, suffer from relatively small hearing losses. In general, it may be said that an increase in the severity of hearing losses will result in a reduced speech intelligibility.
从理论上讲，通常认为在嘈杂的工作环境中使用听力保护器不会影响言语清晰度——事实上，甚至可能会提高言语清晰度。然而，在实际中，人们常常不佩戴听力保护器，因为普遍认为这些会降低言语清晰度。在本文中，描述了一项针对537名受试者进行的关于听力保护器对噪声性听力损失患者言语清晰度影响的调查。从该分析中可以清楚地看出，仅对于那些根据其纯音听力图显示听力损失相对较小的人，使用耳罩才会导致言语清晰度提高。一般来说，可以说听力损失严重程度的增加会导致言语清晰度降低。
