过去的月震研究最主要的限制就是去除噪声，这些噪声由迭加信号在月球的分馏地壳结构中反复反射引起。

A primary limitation to past lunar seismic studies was the wash of'noise' caused by overlapping signals bouncing repeatedly offstructures in the Moon’s fractionated crust.

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但微小裂缝、穿孔引起的涡流检测信号很微弱，容易被各种噪声湮没，分辨起来较困难。

The eddy current signals from thin flaws and perforations are merged by noises and difficult to be distinguished.

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适配电路中的多级并联放大电路、带通滤波器对试车过程中的随机干扰信号，尤其是振动引起的噪声具有很强的抑制作用。

The multi-parallel- magnification circuits and the band-pass filter can well restrain random interfering noise, especially generated by test run vibration.

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