3.6 Noise and Artifact in the ECG【译文】心电图中的噪声和伪迹（伪差）

3.6.1 Noise and Artifact Sources
噪声和伪迹来源

Unfortunately, the ECG is often contaminated by noise and artifacts  that can be
within the frequency band of interest and can manifest with similar morphologies
as the ECG itself. Broadly speaking, ECG contaminants can be classified as [45]:
不幸的是，心电图常常被噪声和伪迹污染，这些噪声和伪迹在我们感兴趣的信号频带内，而且能够
表现出和ECG信号自身相似的形态。宽泛的讲，影响心电图的“污染物”能被分类如下：

1. Power line interference: 50 ±0.2 Hz mains noise (or 60 Hz in many data
sets) with an amplitude of up to 50% of full scale deflection (FSD), the
peak-to-peak ECG amplitude;
电源线干扰（工频干扰）：50 ±0.2 Hz 电源噪声（在很多数据集内是60Hz电源噪声），
幅度可以达到50%的满幅偏转，ECG幅度的峰峰值。

2. Electrode pop or contact noise: Loss of contact between the electrode and the
skin manifesting as sharp changes with saturation at FSD levels for periods
of around 1 second on the ECG (us