但由于与噪声电压的大小，网络频率特性及噪声源功率谱形式有关，故测量准确度较低。
Because it is related to the magnitude of noise RMS voltage, the frequency characteristic of circuit and the power spectrum of noise source, the accuracy of measurement is quite low.
本文采用自功率谱、逆频谱方法对拖拉机变速箱异常噪声源进行了诊断，找出了产生异常噪声的根源。
With auto-power spectrum and cepstrum, this paper diagnoses the unusual noise source of the gear box, and finds an impaired gear of the box.
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.
通过用声强测量系统对水下大型结构体进行了辐射噪声声功率的测定以及噪声源的识别和定位的实验。
The measurement of radiation noises from an underwater structure body and identification and location of noise sources were carried out by using a sound intensity measurement system .
通过对涡轮喷气及涡轮风扇发动机试车噪声的采集和声功率谱分析，讨论发动机的主要噪声源和噪声的特征。
Through noise data collection and power spectrum analysis of turbojet and turbofan, the main noise source and characteristics of noise are discussed.
过零检测器可以通过预报功率谱形状的变化来发现环境噪声中新出现的运动声源，研究了过零检测器的检测性能。
Zero-crossing detector is capable of predicting the shape changes of power spectrum so as to find the newly emerged moving sound sources in ambient noise.
微波辐射计的定标噪声源提供定量噪声功率，是微波辐射计定标中不可缺少的重要部分。
The calibration noise sources of microwave radiometer. gives a quantitative noise power. They are an important and necessary part in calibration of microwave radiometer.
讨论了低频噪声源的最大输出功率、噪声输出幅度以及噪声带宽测试的实现途径。
Some realization ways of measurement are discussed, including the maximum output power, output amplitude and noise bandwidth.
可用作水下目标声特征逼真模拟器(声靶)，也可作其它低频宽带大功率声源使用。
It can be used as a high-performance underwater acoustic target simulator, or as a low frequency broadband high power underwater acoustic source.
本文叙述了一种大功率、宽频带的高声强声源，其额定输出功率为6000声瓦。
This paper describes an acoustic generator with high power and wide bandwidth. The electrophneumatic Loudspeaker has normal power output up to 6000 acoustic watts.
本文主要分析偏相干分析中噪声信号功率谱的处理及声源辐射面积的大小对相干分析结果的影响这两个问题。
The paper mainly demonstrates the principles of the noise power pedigrees dispose and radiated noise areas impact in partial coherence analysis.
麦克风间距的限制是互功率谱加权声源测向方法最大的问题，声源测向精度、角度分辨率与麦克风间距成反比。
The method used in the literature greatly limit the distance between the microphone-array, and the precision of direction finding is related to the distance of the microphone-array.
利用功率谱分析噪声信号的特性，利用相干性确定噪声源。
模拟器具有低频、大功率等优点，并且发射声源级可调，可满足多种海上试验的工程需要。
This simulator has several advantages, e. g. low frequency, high power, and its transmitting sound level is adjustable, which could meet the engineering demands of kinds of open sea tests.
对该柴油机的主要辐射噪声源及其对整机噪声声功率的贡献度以及整机的辐射噪声进行了预测，预测结果与实测结果基本吻合。
The prediction of this diesel engine main noise sources and their contribution to engine sound power is carried out accords with experiment result.
对该柴油机的主要辐射噪声源及其对整机噪声声功率的贡献度以及整机的辐射噪声进行了预测，预测结果与实测结果基本吻合。
The prediction of this diesel engine main noise sources and their contribution to engine sound power is carried out accords with experiment result.
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