Open AccessEvaluation of a damping coefficient influence made by notch filters on efficiency of ECG signals processing
Author(s) -
Yeldos A. Altay,
P.A. Kulagin
Publication year - 2021
Publication title -
cardiometry
Language(s) - English
DOI - 10.18137/cardiometry.2021.19.2037
Subject(s) - band stop filter , signal (programming language) , harmonics , noise (video) , signal processing , filter (signal processing) , quality (philosophy) , transfer function , correlation coefficient , computer science , acoustics , low pass filter , control theory (sociology) , mathematics , electronic engineering , statistics , engineering , artificial intelligence , digital signal processing , voltage , physics , electrical engineering , computer vision , control (management) , quantum mechanics , image (mathematics) , programming language
. The aim of this study is to evaluate the effectof damping coefficient ξ provided by narrow-band notch filterson the quality indicators of the ECG signal processing accompaniedby 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 componentsof signal and noise, test ECG signals from the MassachusettsInstitute of Technology were selected as a model, andelectrical noise was synthesized taking into account their harmonicnature. 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 coefficientsmade 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 processingsystem was revealed when calculating quantitative indicatorscharacterizing the quality solution to the signal filteringproblem. 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 equationswere obtained to characterize the adequacy of the designedmodel 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 selectionof informative components ECG signal under the influenceof high-frequency electrical interference and its harmonics.The sequential incorporation of two narrow-band notchfilters with a damping coefficient ξ = 0.1 to suppress interferenceat a frequency of 50 Hz and its harmonics at a frequencyof 100 Hz opens up new possibilities for processing ECG signals.