详细阐述心电信号的特点及相关的预处理技术。心电信号是低频微弱信号，且处于强噪声背景下，特别是50Hz的工频干扰。本文利用Matlab提供的工具箱，高效地设计出了满足实际要求的滤波器，经仿真后证明了其有效性。

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