其中．怠速和加减速工况下车内噪声振动水平在一 定程度上决定了用户对整车NVH性能的评价． 噪声传递函数（NTF）主要是指输入激励载荷与 输出噪声之间的对应函数关系．用于评价结构对振 动发声的灵敏度特性。
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设计了噪声传递函数ntf，并对其进行了优化。
Furthermore, the noise transfer function (NTF) is designed and optimized.
通过在传递函数中引入两个极点，获得了比多环路级联结构更好的系统噪声性能。
By adding two poles into the transfer function, better noise performances compared with that of the MASH structure are achieved.
介绍了锁相环的基本原理，分析了锁相环各部分电路相位噪声的传递函数。
The basic principle of phase locked loop (PLL) has been introduced, and the transmission function of the phase noises of every part of PLL has been analyzed.
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