The practical methods of signal pre-processing (anti-disturbance filtering, data smoothing) and character extraction (differential limitation, absolute peak value, peak-to-peak value, area of wave and self-adaptive threshold adjustment) are introduced.

• 并介绍了一些实用的信号处理和特征提取算法，包括可以实时运算的用于抑制干扰的滤波器和数据平滑算法及用于定量分析的差分超限数、绝对峰值、峰-峰值、波形下面积和自适应门限调整等算法及其应用。