In order to control the noise of the indoor unit of an embedded air conditioner, the main source of the noise is identified by using separate running and noise spectrum analysis.
为了控制内藏式空调室内机的噪声，运用分步运转、频谱分析等方法判断出主要噪声源。
One of the spectrum analysis methods suitable for speed information analysis in the noise radar signal is also introduced.
文章还介绍了一种适合于分析噪声雷达信号中目标速度信息的谱分析方法。
In this paper, spectrum analysis is carried out for 4102Q diesel engine to investigate the effect of parameters adjustment on noise emission, and to determine its noise sources.
本文通过对4102Q型柴油机噪声的频谱分析与研究，了解该型柴油机参数调整对噪声的影响；
Which is high accuracy in analysis, easy to operate, and can express the rule that hydrodynamic noise intensity changed along with the speed. power spectrum and other factors.
该软件分析精度高、易操作，可给出流噪声强度随航速变化的规律和功率谱等指标。
Traditional speech signal processing is based on FFT power spectral analysis, in noisy condition, the spectrum of noise and speech signal are processed in the same way.
传统语音信号谱特征的提取是基于FFT 的能谱分析方法，在噪音环境情况下，对噪音的频谱成分与语音信号的频谱成分的处理采用“平均主义”的原则。
In this paper the main noise source of SQ6450 type light car was judged by means of spectrum and correlation analysis of noise signal. The corresponding proposal reducing noise was presented.
对SQ 6450轻型汽车进行了噪声测试，通过对噪声信号的频谱分析和相干分析，找出了主噪声源，并提出了降噪措施。
Power spectrum analysis is always used in spectrum analysis of cavitation noise. However, it is obviously unfit for research on the transient signal such as cavitation noise.
空化噪声的谱分析一般采用功率谱分析，而功率谱分析在研究空化噪声这种具有很强突变性的信号具有明显的缺陷。
The theory of coherence function and spectrum of vibration and noise signals is applied in gearbox noise analysis in the paper. The basis of fault diagnosis of gearbox is theoretically introduced.
应用振动、噪声信号频谱分析和相干函数分析技术，从理论上说明变速箱故障诊断的依据。
The parameter estimation of sine-wave flooded in strong noise background is an important and practical technique, and it is the base theory of spectrum analysis estimation.
估计淹没在噪声中的正弦波参量是具有实际应用价值和普遍意义的技术之一，也是测试所有谱估计性能的基础。
Applying the order bi-spectrum in the analysis of engine noise signals shows that it can extract the fault characteristics and realize the state monitoring.
运用此方法对内燃机主轴承不同间隙下的噪声信号进行分析，结果表明，此方法能有效地提取故障的特征，实现状态监测。
In this paper, the theory and the experimental technique about the identification of a noise source using a cross-spectrum analysis method have been studied.
本文研究了互谱分析法在噪声源定位应用上的理论和实验技术。
The source of noise in the high pressure plunger pump is identified through frequency spectrum analysis and measurements show significant reduction of noise in the improved plunger pump.
基于高压柱塞泵噪声产生的机理分析与振动频率的计算，找出产生噪声的根源；对实验测得频谱曲线进行频谱分析表明，改进后的高压柱塞泵的噪声得到了明显地改善。
The source of noise in the high pressure plunger pump is identified through frequency spectrum analysis and measurements show significant reduction of noise in the improved plunger pump.
基于高压柱塞泵噪声产生的机理分析与振动频率的计算，找出产生噪声的根源；对实验测得频谱曲线进行频谱分析表明，改进后的高压柱塞泵的噪声得到了明显地改善。
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