本文详细叙述了数字滤波器在ECG中的应用，探讨了应用数字滤波到心电图机中并取得良好的效果。数字滤波器不仅抑制能力很强，其计算也十分简单，十分适合于在基于计算功能有限的微处理器的心电图机中应用。在心电图信号的测量中，存在很强的噪声和干扰。这些干扰噪声往往与信号的频率相重叠。在有效地保存有用信号的情况下最大限度地抑制心电信号测量中噪声，历来就是技术上的一个难点。数字滤波器在数字图像处理中早已得到广泛的应用，这种滤波器可以有效地消除噪声而保留原信号的一些必要形状特征。Chee Hung Henry Chu和Edward J.Delp提出了采用数字滤波器来消除ECG信号中的基线漂移和脉冲噪声。试验结果清楚地表明，这些技术可以有选择性地去除脉冲噪声和基线漂移，同时避免了其它应用硬件或软件线性滤波器可能带来的失真。
关键词：数字滤波器，心电图，噪声，失真
Abstract
The digital filter is discussed in this paper and it's application in electrocardiog
-ram is also presented. This linear filter has excellent capability in the removal of some kinds of common but important interference.Furthermore, much less calculation is needed in the digital filter morphology. Undoubtedly digital filter is perfectly fit for the application in the μP based ECG. There are many kinds of strong interference in the ECG measuring. Their frequency bandwidths often overlap with that of ECG.It has been a big problem to remove these interference while keep as much useful ECG as possible for many years. Digital filter form of filters in digital image processing has long been widely used, this non-linear filter can effectively eliminate the noise and retain the original signal of some essential features of shape. Chee Hung Henry Chu and Edward J. Delp made use of digital filter patterns filter to eliminate the baseline ECG signal drift and pulse noise. The results clearly indicate that these technologies can selectively remove impulse noise and baseline drift, while avoiding the application of other hardware or software Linear Filter possible distortion.
