Comparative Study of Chebyshev I and Chebyshev II Filter used For Noise Reduction in ECG Signal

--Signal processing, in general, has a rich history, and its importance is evident in diverse fields as biomedical engineering, acoustics, Sonar. The importance of the digital signal processing appears to be increasing with no visible sign of saturation. The impact of digital signal processing techniques will undoubtedly promote revolutionary advances in some fields of application. A notable example is in the area telephony, medicine. In many medical application, there is need to remove frequency components from a signal while leaving rest of spectrum unaltered. While recording ECG signal it gets corrupted due to different noise interferences and artifacts. Noise and interference are usually large enough to obscure small amplitude features of the ECG hat are of physiological or clinical interest. The bandwidth of the noise overlaps that of wanted signals, so that simple filtering cannot sufficiently enhance the signal to noise ratio. The present paper introduces the digital filtering method to cope with the noise artifacts in the ECG signal. The Chebyshev I and Chebyshev type II filters are applied on the ECG signal. The detailed design procedure with there responses are depicted in the paper. This article also gives the comparison of both types of the filter. It is found that both digital filters works satisfactory with some limitations. All the designs are implemented using MATLAB FDA tool. ECG data is acquired from the Instrumentation amplifier designed in the Laboratory. For the interfacing of ECG amplifier to the computer advantech 711B add on card has been used. Results of the filter are compared with other filters also.