In this article, PLL theory, design of loop filter and phase noise theory are introduced at first.

本文先介绍了锁相环的工作原理，环路滤波器的设计并对相位噪声的理论进行了阐述。

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Impact noise theory is used to study the noise properly from the type 1515 loom and to identify the noise source.

从撞击噪声形成机理出发，分析了1515型自动棉织机噪声的声学特性和主声源。

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The mathematical model of traffic flow and traffic noise was established in this paper upon the fluid mechanics and noise theory.

利用流体力学与噪声理论建立了交通流和交通噪声数学模型。

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Although information theory the analysis of signals and noise was first developed in the 1940s, it has only recently been applied to biology.

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Mechner said that in theory it should, but in practice execution data included a huge amount of fundamental statistical noise.

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