Department of Vibroacoustic Hazards, Central Institute for Labour Protection-National Research Institute, Czerniakowska 16, 00-701 Warsaw, Poland.
Int J Environ Res Public Health. 2022 Feb 23;19(5):2579. doi: 10.3390/ijerph19052579.
In the work environment, miniature electroacoustic transducers are often used in communication, for the transmission of warning signals or during training. They can be used in headphones or mounted in personal protective equipment. It is often important to reproduce sounds accurately. The purpose of this work was to assess audio strips by comparing the frequency response of the signal in the electrical outputs of six common-purpose devices. Based on the risk of hearing damage, the level of noise exposure was assessed. The following headphones were investigated: low-budget closed-back, open-back for instant messengers, open-back for music, and in-ear. A head and torso simulator with a transfer function was used. The most uniform shape of the frequency response of the signal at the electrical outputs was found to be in smartphones. Sound cards integrated into laptop motherboards had highly unequal characteristics (up to 23 dB). In the case of one of the laptops, the upper range of the transmitted frequencies was limited to the 12,500 Hz band. An external sound card or wireless headphones can improve the situation. In the worst-case scenario, i.e., rock music, the listening time was limited to 2 h and 18 min.
在工作环境中，微型电声换能器常用于通信，用于传输警告信号或培训期间。它们可以装在耳机里，也可以装在个人防护设备上。准确再现声音通常很重要。这项工作的目的是通过比较六种通用设备的电输出信号的频率响应来评估音频条。根据听力损伤的风险，评估了噪声暴露水平。研究了以下耳机：低成本封闭式、即时通讯开放式、音乐开放式和入耳式。使用具有传递函数的头部和躯干模拟器。在电输出信号中发现智能手机的频率响应形状最均匀。集成在笔记本电脑主板上的声卡具有高度不均匀的特性（高达 23 分贝）。在其中一台笔记本电脑的情况下，传输频率的上限限制在 12500 Hz 频段。外部声卡或无线耳机可以改善这种情况。在最坏的情况下，即摇滚音乐，听音乐的时间限制在 2 小时 18 分钟内。
