Arakelian A G
Gig Tr Prof Zabol. 1991(2):25-7.
The article narrates on the study of the impulse-background index evaluated as the difference between the levels measured with a phonemeter at the 'impulse' ('I') and 'slow' ('S') temporal characteristics and within the noise impulses' amplitude-temporal parameters. It was established that delta L was the function of both the amplitude and the impulse duration. If the impulse duration was commensurable with the constant 'S',--delta L was regularly less than 7 dBa irrespective of the actual 'impulse-background' correlation. Expositions of the noises with equal delta L and different amplitude-temporal characteristics were performed with a group of volunteers and resulted in different biologic effects. It was suggested that the delta L evaluation technique proposed by the existing hygienic standards was inadequate and needed reconsideration.
本文叙述了对脉冲 - 本底指数的研究，该指数通过声级计在“脉冲”（“I”）和“慢”（“S”）时间特性下测量的水平差异以及噪声脉冲的幅度 - 时间参数来评估。研究发现，ΔL 是幅度和脉冲持续时间的函数。如果脉冲持续时间与常数“S”相当，无论实际的“脉冲 - 本底”相关性如何，ΔL 通常小于 7 dBa。对一组志愿者进行了具有相同 ΔL 和不同幅度 - 时间特性的噪声暴露实验，结果产生了不同的生物学效应。研究表明，现有卫生标准提出的 ΔL 评估技术并不充分，需要重新考虑。
