该滤波器在基频处的幅值无衰减，相位无延时，能将2次以上的谐波全部滤掉。
The filter has no fundamental frequency decay and phase delay, and all harmonics above2nd order are filtered.
该方法使未知输入在故障发生前衰减到几乎处处为零，系统近似为无未知输入的标准系统。
This method can almost get unknown inputs attenuation to zero everywhere before the fault happening, then the system is approximately standard system without unknown inputs.
光衰减器是一种广泛应用的无源光器件。
Optical attenuator is a kind of widely used passive optical component.
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