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在低背景噪声的野外环境中，采用小闭集汉语（声母）清晰度测试方法，试验比较了四种防毒面具的清晰度水平。测试结果证实：与不佩戴面具相比，佩戴面具后语言清晰度得分严重降低，并随通话距离的增加而进一步恶化；以７５％清晰度得分作为通话性能的可接受限度，那么，不佩戴面具及佩戴四种面具的有效通话距离分别为 ６３．６、１５．７、１８．６、２５．０和 ２６．９ ｍ。此外，结合对四种面具传声特性测定结果，本文还分析了清晰度测试方法及其结果的合理性。
In the low background noise of the outdoor environment, the use of small closed set Chinese (initial) definition test method, the test compared the clarity of four gas masks level. Test results show that: Compared with no mask, the masks after wearing a sharp decline in language sharpness score, and as the call distance further deteriorated; with 75% sharpness score as call performance acceptable limit, then, do not wear a mask And wearing four kinds of masks effective call distance 63.6,15.7,18.6,25.0 and 26.9 m. In addition, combined with four kinds of masks measured the sound characteristics of the results, this article also analyzes the sharpness test method and its rationality.