本文介绍了国家标准中内燃机噪声测试对声学测试环境的要求，提出了内燃机噪声实验室建设的指标。
This paper introduces the requirements for sound testing environment by the national standards for engine noise testing and proposes the targets for the construction of engine noise laboratories.
可以推广到语音识别、环境噪声监测和实验室测量等多种领域，应用前景广阔。
With broad application prospect, this solution can be extended to the field of speech recognition, ambient noise monitoring and laboratory measurement etc.
通过采用国际上先进的实验室比对和能力验证方法，提出了相位噪声测试系统的比对方案。
The comparison method in phase noise measurement system is introduced by means of the advanced way in interlaboratory comparison and proficiency testing.
通过实验室实验，初步验证了半各向异性噪声场对矢量水听器检测性能的影响。
By the experiment at result, the influence of isotropic noise field on detective capability of vector hydrophone is tested.
经过实验室试验和现场安装试验，证明该技术可有效降低轮轨辐射噪声。
After lab test and onset installation test, it has been proved that this technology can effectively reduce the wheel-rail radiation noise.
在实验室环境研究轴流式通风机噪声的主动控制问题。
The initiative control of the noise producing by axial flow ventilator is investigated in experiment environment.
大多数实验室和工业环境中存在全频率下有多种电子噪声源，主要来自重型设备、器械、能量源和显示器。
Most laboratories and industrial environments have many kinds of electrical-noise sources at all frequencies from heavy machinery, instruments, power supplies, and TV stations.
混响室是声学专业的实验室用房，它在测量声波无规入射时材料的吸声系数和测量噪声源的声功率级中得到了广泛应用。
In the measurement of sound absorption coefficient in random incidence and determination of sound power levels of noise sources, the reverberation room is used very extensively.
在对TSA50-C型商用步进电机的测量中，结果验证了这种测量系统在普通实验室环境噪声中可以达到纳米级的位移测量精度。
The results of measurement with TSA50-C commercial stepping motor show that a displacement accuracy of nanometers scale is achieved in the common laboratorial environment.
利用实验室现有的简单设备组成实验装置，测定了正常的听阈曲线、有噪声干扰时的听阈曲线、 分散注意力时的听阈曲线。
The audiogram of pure tone, of noise and of distractive energy are obtained. The measuring device is composed of simple apparatus in lab.
利用实验室现有的简单设备组成实验装置，测定了正常的听阈曲线、有噪声干扰时的听阈曲线、 分散注意力时的听阈曲线。
The audiogram of pure tone, of noise and of distractive energy are obtained. The measuring device is composed of simple apparatus in lab.
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