This paper presents a new type of low noise frequency conversion circuit based on the research of phase noise conception, generation as well as relativity measurement method.

本文在对相位噪声的概念、产生及其相关测量方法研究的基础上，设计出一种低噪声频率变换电路。

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The team recorded data from the Opportunity's accelerometers, and sped up the low-frequency noise 1, 000 times. The result is best described as a sort of grinding noise.

队员从机遇号加速器收录数据，将低频噪声加快速度1000倍，然而结果对这种声音最好的描述是：这是一种轧轧声。

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EMD similars the wavelet transforms, the decomposition result is from high frequency to the low frequency distribution, namely the noise mainly concentrates in first several.

经验模式分解的主要思想类似小波变换，分解结果是由高频到低频分布的，即噪声主要集中在前几层。

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Residents of Waubra, a town near Victoria's biggest wind generator, recently complained that low-frequency noise was causing headaches and earaches.

ECONOMIST: Wind energy and politics

Over the years, the government has taken steps to address the problem, including regulating low-frequency noise like water pumps, and reducing maximum decibels.

BBC: Taiwan's noise pollution dilemma

Its scientific committee said low-frequency ambient marine noise levels had increased in the northern hemisphere by two orders of magnitude over the last 60 years.

BBC: NEWS | Science/Nature | The deafening sound of the seas