Yiu Edwin M-L, Yip Priscilla P S
Division of Speech and Hearing Sciences, Voice Research Laboratory, The University of Hong Kong, Pokfulam, Hong Kong.
Division of Speech and Hearing Sciences, Voice Research Laboratory, The University of Hong Kong, Pokfulam, Hong Kong.
J Voice. 2016 Jul;30(4):389-93. doi: 10.1016/j.jvoice.2015.05.016. Epub 2015 Jun 21.
This study investigated the effects of environmental noise on the production of vocal intensity and fundamental frequency using an accelerometer.
Twenty-four vocally healthy young adults (12 men and 12 women, aged 19-22 years) recorded a monologue passage using KayPENTAX (Montvale, NJ, USA) Ambulatory Phonation Monitor (model 3200) under three natural environmental conditions in a randomized order: a quiet room (mean noise, 35.5 dBA), room with moderate level of noise (mean noise, 54.5 dBA), and a room with high noise (mean noise, 67.5 dBA).
Both gender groups showed significant increases in the mean vocal intensity, fundamental frequency, and perceived vocal effort in the high-noise environment than in the other two conditions. No significant difference was found in the vocal intensity between the quiet and moderately noisy environment except in the fundamental frequency in the female group.
This study showed that the use of accelerometer for laryngeal signal recordings could be a useful tool for measuring phonation without being affected by the background noise. The findings also support the recommendation that noise levels for conversation should be kept <50-55 dB to maintain speech intelligibility.
本研究使用加速度计调查环境噪声对嗓音强度和基频产生的影响。
24名嗓音健康的年轻成年人（12名男性和12名女性，年龄19 - 22岁）使用KayPENTAX（美国新泽西州蒙特瓦尔）动态发声监测仪（型号3200），以随机顺序在三种自然环境条件下录制一段独白：安静房间（平均噪声，35.5 dBA）、中度噪声房间（平均噪声，54.5 dBA）和高噪声房间（平均噪声，67.5 dBA）。
与其他两种条件相比，两个性别组在高噪声环境下的平均嗓音强度、基频和感知到的发声努力均显著增加。除女性组的基频外，安静环境和中度噪声环境下的嗓音强度无显著差异。
本研究表明，使用加速度计记录喉部信号可能是一种不受背景噪声影响的测量发声的有用工具。研究结果还支持将对话噪声水平保持在<50 - 55 dB以维持言语可懂度的建议。
