Effects of Earmuff Using on Signal-to-Noise Ratio of Distortion Product OtoAcoustic Emission in White Noise Environments

The Korean Society of Medicine & Therapy Science Pub Date : 2023-11-30 DOI:10.31321/kmts.2023.15.2.69

Seung-Deok Heo

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Abstract

Objective: Earmuff has been shown to attenuate noise and may be useful in boothless audiometry. This study aimed to determine the effect of earmuff use on the signal-to-noise ratio of distortion production otoacoustic emission (DPOAE) in a white noise environment. Method: Participants were 19 young, healthy men and women (38 ears) aged 22.45±1.31 years. The hearing threshold level in 1, 2, 3, and 4 ㎑ did not exceed 15 ㏈ HL. DPOAE was performed at four points per octave in the range 842 to 9,509 ㎐ based on f2. After obtaining the baseline (Base), white noise was presented at 10 ㏈ intervals from 40 to 70 ㏈ SPL. DPOAE was obtained without (WN) and with earmuff (Earmuff). The maximum permissible ambient noise level (MPANL) of the WN and Earmuff were compared (paired t-test). Signal-to-noise ratio (one-way repeated measures ANOVA) and PASS rate (Chi-square test) between WN, Earmuff and Base at the overall frequency, mid-frequency (mid-3-freq), and high-frequency (hi-3-freq) bands were analyzed. Results: There was a difference of 22.19 ㏈ in MPANL between Base and WN (p=.000). There was a significant difference in the SNR between Base and WN from 40 ㏈ SPL, and in PASS rate between Base and Earmuff from 60 SPL (p<.005). Conclusion: In DPOAE, earmuff increase MPANL, which enables recording at up to 60 ㏈ SPL. The SNR in the high-frequency band is more preserved than in the lower, Therefore, it seems advantageous for early detection of cochlear microstructural changes due to noise or aging.

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使用耳罩对白噪环境中失真产物声发射信噪比的影响

目的：耳罩具有减弱噪声的作用，可用于无岗亭测听。本研究旨在确定在白噪声环境中使用耳罩对失真的耳声发射（DPOAE）信噪比的影响。研究方法：参与者为 19 名年轻健康的男性和女性（38 耳），年龄为 22.45±1.31 岁。1、2、3 和 4 ㎑的听阈水平不超过 15 ㏈ HL。在获得基线（Base）后，以 10 ㏈的间隔从 40 ㏈ SPL 到 70 ㏈ SPL 播放白噪声。在不戴耳罩（WN）和戴耳罩（Earmuff）的情况下获得 DPOAE。比较了 WN 和 Earmuff 的最大允许环境噪音水平 (MPANL)（配对 t 检验）。分析了 WN、Earmuff 和 Base 在全频、中频（mid-3-freq）和高频（hi-3-freq）频段的信噪比（单向重复测量方差分析）和通过率（卡方检验）。结果显示Base 和 WN 的 MPANL 相差 22.19 ㏈ (p=.000)。从 40 ㏈ SPL 起，Base 和 WN 的信噪比有明显差异，从 60 SPL 起，Base 和 Earmuff 的 PASS 率有明显差异（p<.005）。结论：在 DPOAE 中，耳罩可增加 MPANL，从而能够在高达 60 ㏈ SPL 时进行记录。高频段的信噪比（SNR）比低频段的信噪比（SNR）保存得更好，因此，它在早期检测噪声或老化引起的耳蜗微结构变化方面似乎很有优势。

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The Korean Society of Medicine & Therapy Science

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