A method for removing low varying frequency trend from ECG signal

The aim of this work is based on recovering the ECG signal from low frequency varying noise. The method used for this purpose is simple, the well known moving average filter. For this work the moving average filter is used to operate as a highpass filter. The filtering system functions basically to remove the trend added to the ECG signal. The authors have seen that the moving average filter recovers perfectly the low varying trend. Then by subtracting the recorded data from the trend, the noise-free ECG signal is obtained. Moreover, the effectiveness of the proposed method is shown in the frequency domain