Evaluation of a damping coefficient influence made by notch filters on efficiency of ECG signals processing

Cardiometry

article

Yeldos A. Altay¹  Pavel A. Kulagin¹ 

[1]St Petersburg National Research University of Information Technologies

关键词: Analysis of ECG signal processing;    Test ECG signals;    Notch filter;    Damping coefficient;    Resonant frequency;    Power line interference;    Regression analysis;    System noise resistance;    Measurement accuracy;    Filter stability;    Statistical data processing;   

DOI  :  10.18137/cardiometry.2021.19.2037

学科分类：环境科学（综合）

来源: Russian New University

【 摘 要 】

Introduction. The aim of this study is to evaluate the effectof damping coefficient ξ provided by narrow-band notch filters on the quality indicators of the ECG signal processing accompanied by development of a special software package forexperimental testing of the cascade filtering system of naturalelectrical noise and its harmonics.Materials and Methods. For the formation of additive components of signal and noise, test ECG signals from the Massachusetts Institute of Technology were selected as a model, andelectrical noise was synthesized taking into account their harmonic nature. The transfer function of the notch filtering systemwas tuned and calculated. Quantitative quality metrics was usedto determine the processing efficiency at the input and output ofthe signal filtering system. To assess the effect of damping coefficients made on the ECG signal processing system, the method ofthe linear regression analysis was applied. Methods of structuraland procedural programming were used to create a softwarepackage for processing a full-scale noisy signal recording.Results. An increase in the efficiency of the ECG signal processing system was revealed when calculating quantitative indicators characterizing the quality solution to the signal filtering problem. It has been found that at values of the dampingcoefficient ξ = 0.1, the efficiency of the analysis of ECG signalprocessing in terms of accuracy and noise resistance increases,and the filtering error decreases due to the improvement ofthe selectivity of the notch filter at the resonant frequency. Theeffect of the damping coefficient on the quality indicators ofECG signal processing was established, and regression equations were obtained to characterize the adequacy of the designed model for the confidence interval (P = 0.99) at p <0.01.The performance of the developed software package has beendemonstrated, which combines a cascade filtering system witha damping coefficient ξ = 0.1, to eliminate the natural electricalinterference of the ECG signal and its harmonics.Conclusion. The evidence data obtained in our work, both calculated (theoretical) and practical (experimental) data, confirmthe efficiency of the proposed processing approach to the selection of informative components ECG signal under the influence of high-frequency electrical interference and its harmonics. The sequential incorporation of two narrow-band notchfilters with a damping coefficient ξ = 0.1 to suppress interference at a frequency of 50 Hz and its harmonics at a frequencyof 100 Hz opens up new possibilities for processing ECG signals.

【 授权许可】

CC BY