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目的 测量和比较稳态噪声环境下外耳道口和鼓膜处的声压值 ,观察外耳道声学效应最大的频率范围 ,为个体噪声计量仪的设计及研究环境噪声对人体的影响提供精确的数据 ,为噪声暴露声压值的校正提供参考。方法 在 5 0dBSPL稳态窄频带噪声声压下 ,分别于 0 .2 5～ 8.0 0kHz用AudioScanRM5 0 0测量 30人 ( 6 0耳 )外耳道口及鼓膜处的声压值 ,比较各个频率段外耳道口和鼓膜处声压差值的差异。结果 在相同频率段 ,不同受试者双耳之间及男女之间外耳道口的声压值小于( 0 .2± 1.8)dBSPL ,鼓膜处的声压值小于 ( 0 .6± 2 .6 )dBSPL ,差异均无显著性 (P >0 .0 5 ) ,故将相同频率段外耳道口及鼓膜处的声压值结果合并统计。在 1.5 0kHz以上频率段 (含 1.5 0kHz)外耳道口和鼓膜处的声压差值的差异有显著性 (P <0 .0 1)。在 2 .0 0kHz处其差值最大 ,为 ( 10 .5± 3.4 )dBSPL。在0 .5 0kHz处其差值最小 ,为 ( 0 .5± 6 .2 )dBSPL。结论 对中心频率为 1.5 0kHz(含 1.5 0kHz)以上的噪声 ,在评价环境噪声及使用噪声个体计量仪时应考虑外耳道的增压作用
Objective To measure and compare the sound pressure value at the external auditory canal and tympanic membrane under steady-state noise environment and to observe the maximum frequency range of external auditory canal acoustical effect, to provide accurate data for the design of individual noise meter and study on the impact of environmental noise on human body, Exposure sound pressure correction for reference. Methods The sound pressure at the external auditory meatus and the tympanic membrane of 30 human ears (60 ears) was measured at a sound pressure of 5 0dBSPL at a narrow band noise at 0. 25 ~ 8.0 0kHz using AudioScan ™ 500 respectively. And tympanic at the sound pressure difference between the value. Results The sound pressure of the two ears of different subjects and the external auditory canal between men and women was less than (0.2 ± 1.8) dBSPL in the same frequency band. The sound pressure at the tympanic membrane was less than (0.6 ± 2.6) dBSPL, the difference was not significant (P> 0.05), so the same frequency band at the ear canal and tympanic membrane sound pressure results at the merger statistics. The difference in sound pressure at the external auditory canal and tympanic membrane at frequencies above 1.5 0 kHz (including 1.5 0 kHz) was significant (P <0.01). The difference is the largest at 2.00 kHz, which is (10.5 ± 3.4) dBSPL. The difference is the smallest at 0 .5 0kHz, which is (0 .5 ± 6 .2) dBSPL. Conclusion For central frequencies of 1.5 0 kHz (including 1.5 0 kHz) above the noise, in assessing environmental noise and the use of noise individual meter should consider the external auditory canal booster