一、导言生物信号通常有着一个有限带宽的频谱。实际上信号的记录会受到来自生物体及环境噪声的干扰。例如,ECG信号的记录会受到宽带肌电噪声的干扰,而低通滤波器能抑制频率高于所需信号截止频率的噪声。对生物信号求微分是一种很有用的提取信号中的瞬态信息的信号处理手段。在数字滤波器中,低通滤波与求微分通常是作为两个串联的环节。人们已作了一些研究以将这两个环节合二为一,从而构成 I. INTRODUCTION Biosignals usually have a spectrum of finite bandwidth. In fact, the recording of the signal can be disturbed by organisms and environmental noise. For example, recording of ECG signals can be disturbed by broadband myoelectric noise, which can suppress noise at frequencies above the cut-off frequency of the desired signal. Differential signaling of biological signals is a useful signal processing method for extracting transient information in signals. In digital filters, low-pass filtering and differentiation are usually used as two links in series. People have done some research to combine these two aspects into one