测量失真产品耳声发射时的最大允许环境噪声和特定频率的平均时间。

J Lee, J Kim
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引用次数: 11

摘要

对20名听力正常的成年人进行了环境噪声和平均时间对畸变产物耳声发射(DPOAE)测量的影响。对于0.7至6 kHz的每个频率,在四个不同的平均时间内,在九个强度水平的环境噪声下测量2f1-f2 dpoae。感兴趣的因变量是DPOAE:噪声比(D:N)- DPOAE振幅与2f1-f2噪声水平之间的关系。研究结果表明,相对于基线条件(25 dBA), 40 dBA或更高的环境噪声水平在较低频率上显著影响D:N。然而,55-65 dBA的噪声水平对较高频率的D:N没有影响。结果还表明,为了实现可检测的dpoae,随着环境噪声的增加和频率的降低,需要更长的平均时间。根据结果,估计与平均时间有关的最大容许环境噪音声级(mpanl)。
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The maximum permissible ambient noise and frequency-specific averaging time on the measurement of distortion product otoacoustic emissions.

The effects of ambient noise and averaging time on distortion product otoacoustic emission (DPOAE) measurements were systematically examined in 20 normally hearing adults. For each frequency from 0.7 to 6 kHz, 2f1-f2 DPOAEs were measured at nine intensity levels of ambient noise for each of four different averaging times. The dependent variable of interest was the DPOAE:noise ratio (D:N)--the relationship between DPOAE amplitude and noise level at 2f1-f2. Findings indicated that, relative to the baseline condition (25 dBA), ambient noise levels of 40 dBA or greater affected the D:N considerably in the lower frequencies. However, noise levels of 55-65 dBA did not affect the D:N in the higher frequencies. Results also indicated that, to achieve detectable DPOAEs, longer averaging times were required as ambient noise increased and as frequency decreased. Based on the results, the maximum permissible ambient noise levels (MPANLs) were estimated in relation to averaging time.

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