Dolder Craig N, Fletcher Mark D, Lloyd Jones Sian, Lineton Benjamin, Dennison Sarah R, Symmonds Michael, White Paul R, Leighton Timothy G
Institute of Sound and Vibration Research, University of Southampton, Southampton, Hampshire, SO17 1BJ, United Kingdom.
Department of Audiology and Hearing Therapy, Royal South Hants Hospital, Brinton's Terrace, Southampton SO14 0YG, United Kingdom.
J Acoust Soc Am. 2018 Oct;144(4):2565. doi: 10.1121/1.5064279.
Acoustic radiation from three commercial pest deterrents and two hair dryers were measured in an anechoic chamber. The deterrents were chosen because the frequency range at which they emit the most energy is either in the very high-frequency sound band (11.2-17.8 kHz) or the ultrasound band (greater than 17.8 kHz). These are sources that may be heard by a subset of the general population, with the young typically having better high frequency sensitivity. A hairdryer reported to increase the frequency of the motor noise above the audible hearing range was compared with a standard hairdryer. The outputs of the deterrents are compared against six international regulations and guidelines for audible and ultrasound exposure. Multiple ambiguities in the application of these guidelines are discussed. These ambiguities could lead to a device being considered as in compliance despite unconventionally high levels. Even if a device measured here meets a guideline, actual exposures can exceed those taken here and may therefore breach guidelines if the listener is closer to the device or reflections increase the exposure level.
在消声室内测量了三种商用害虫驱避器和两台吹风机的声辐射。选择这些驱避器是因为它们发射能量最多的频率范围要么在甚高频声频段（11.2 - 17.8kHz），要么在超声频段（大于17.8kHz）。这些声源可能会被一部分普通人群听到，年轻人通常具有更好的高频敏感性。将一台据报道能将电机噪声频率提高到可听范围之上的吹风机与一台标准吹风机进行了比较。将这些驱避器的输出与六项关于可听声和超声暴露的国际法规及指南进行了对比。讨论了这些指南应用中的多重模糊性。这些模糊性可能导致一个设备尽管水平异常高却被认为符合规定。即使这里测量的设备符合一项指南，但如果听众离设备更近或者反射增加了暴露水平，实际暴露量可能会超过这里测量的数值，从而可能违反指南。
