Abstract
In studying the problems of communication among coal miners, it was desirable to replicate electronically certain aspects of their hearing abilities so that one group of normal-hearing subjects could be used for the entire study. Tests were designed to determine the ability of miners to hear speech and nonspeech signals in noise and quiet, with and without ear protectors. Since miners cover a wide range of ages with varying amounts of hearing loss, the literature dealing with hearing of noise-exposed miners was surveyed and collated to obtain audiograms of three representative subgroups. From this threshold data, a linear transformation was used to obtain equal loudness contours for bands of noise. Three electrical filters were then developed from this data to approximate the frequency response aspects of the miners' hearing loss. The derivation of the filters and some results of tests involving their use will be described. [This research was supported by a contract with the U. S. Bureau of Mines.]
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