Chapter two talks about the currently situation and the origin of noise pollution come from in Macau.

第二章谈及澳门噪音污染的现状况与原因。

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Mainly introducing the feature of the noise, the origin of the noise, model of the noise, Median filtering and equilibrium of the gray.

主要介绍了噪声的特征、噪声的来源、噪声的模型、中值滤波、拉普拉斯锐化、灰度的均衡等。

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By imitating of the design characters of the high frequency circuit, the origin and the classification of the noise interferences of the low field NMR circuit system are analyzed.

此外本文参照高频电路的设计特点，分析了低场磁共振信号放大电路的噪声干扰来源，给出了一些减少噪声干扰的具体措施。

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The WDCS says the frequency ranges of some noise sources of human origin may be blotting out other, biologically important sounds, preventing mothers and calves from staying in touch and masking sound cues for predators and their prey.

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