本文詳細敘述了數字濾波器在ECG中的應用，探討了應用數字濾波到心電圖機中并取得良好的效果。數字濾波器不僅抑制能力很強，其計算也十分簡單，十分適合于在基于計算功能有限的微處理器的心電圖機中應用。在心電圖信號的測量中，存在很強的噪聲和干擾。這些干擾噪聲往往與信號的頻率相重疊。在有效地保存有用信號的情況下最大限度地抑制心電信號測量中噪聲，歷來就是技術上的一個難點。數字濾波器在數字圖像處理中早已得到廣泛的應用，這種濾波器可以有效地消除噪聲而保留原信號的一些必要形狀特征。Chee Hung Henry Chu和Edward J.Delp提出了采用數字濾波器來消除ECG信號中的基線漂移和脈沖噪聲。試驗結果清楚地表明，這些技術可以有選擇性地去除脈沖噪聲和基線漂移，同時避免了其它應用硬件或軟件線性濾波器可能帶來的失真。
關鍵詞：數字濾波器，心電圖，噪聲，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.
