By means of the principle of correlation analysis, this paper introduces an approximate method for estimating signal-to-noise ratio on random noise background.

本文利用相关分析的原理，提出一种在随机噪音的背景上估算信噪比的近似方法。

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This paper carried on full analysis in the principle and control methods of engine combined noise.

本文对内燃机燃烧噪声产生的机理及其控制方法进行了比较全面的分析研究。

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Through an analysis of noise and vibration characteristics, an experimental principle and method is introduced to eliminate the noise and vibration in communication automobiles.

通过对通讯车辆噪声和振动特性的分析，介绍了在该车上进行的振动和噪声改进对比试验的试验方法及试验原理；

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