All kinds of methods measuring noise have been produced and A-weighting sound level is extensively used as a kind of fundamental measure in all of the world.
针对不同环境下的噪声国际上提出了很多评价方法，目前为世界上广泛应用的是以A声级作为基本评价量的评价方法。
The a sound level on influencing humans' hearing sense normally adopt as an index in current noise assessment standards, though psychological and mental influence is neglected.
现有噪声标准一般采用基于对人听觉影响的A声级作为评价量指标，而忽视了噪声对人的心理和精神方面的影响。
In the middle is a sound level meter.
在中东是一个声级计。
The noise level of passenger car tire was measured in a reverberation laboratory.
在混响室内测试了轿车轮胎的噪声声级。
Often a hand held integrating sound level meter such as the Model 30 would be mounted on a tripod at a boundary position and, for example, a 15 minute measurement made.
通常，一个手持集成示范等30人是在边界上的三脚架安装位置和声级计，例如，一个15分钟的测量制成。
The paper concludes that noise pressure level emitted from the headstock of a lathe is closely related to its idle running Empirical formula has been derived for calculating machine noise.
本文提出机床床头箱辐射的噪声声级与其空载功率有密切关系，并导出计算机床噪声的经验公式。
In this article we introduce a method named "reference sound level calibration", and this article briefly presents and illuminates how to realize this method.
文章首次提出“参考声级校准法”的概念，并利用数字校准的方式实现了自动声级校准，对“参考声级校准法”实现方法作了简要的说明与阐述。
Some factors that affect the sound level of the noise emitted from a three-channels nozzle were investigated.
研究了影响三通道喷嘴噪声声级的相关因素。
Its core is a microcomputer in which a data acquisition card is installed. The system can perform noise measurement by using hardware resources of computer.
该系统以声级计和微机为核心，装上由信号调理和模数转换两部分组成的数据采集卡，完成对风机噪声的测量。
In order to improve the accuracy of test results from pulsimeter, how to select a proper scale range in the pulsimeter is illustrated.
另外为提高声级计测枪炮噪声的精度，对如何正确选择声级计表头刻度范围的问题也作了较详细的说明。
Sound-level meter by its simple, convenient, the cost is low, the precision higher a series of merits, become one of aircraft noise measurement aspect main metering equipment.
声级计以其简单，方便，成本低，精度高等一系列优点，成为航空器噪音测量方面主要的测量仪器之一。
A pneumatic tire having land sections with acute Angle sections, in which the level of air column tube resonance sound is reduced with uneven wear resistance maintained at high level.
一种充气轮胎，其包括具有锐角部的陆部，不仅能维持耐单边磨损性能，还能降低气柱共鸣声声级。
A pneumatic tire having land sections with acute Angle sections, in which the level of air column tube resonance sound is reduced with uneven wear resistance maintained at high level.
一种充气轮胎，其包括具有锐角部的陆部，不仅能维持耐单边磨损性能，还能降低气柱共鸣声声级。
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