This paper analyses the characteristics of noise and presents the mernod of promoting S/N by inserting a band-pass pre-filter, which can reduce the Pe in data communication under small signal.

通过对噪声特性的分析，提出了用前置带通滤波器来提高信噪比的方法，改善微弱信号时数据通信的效果。

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The high pass and low pass and ellipse-filter are realized by the medium of the MAX264 s programming.

然后利用单片机对MAX264编程，实现低通、高通及椭圆滤波器。

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