An improved VMD denoising algorithm achieved higher signal-to-noise ratio and correlation coefficient, and lower mean square error compared with traditional EMD and VMD algorithms.
Does an improved VMD algorithm improve ECG denoising performance compared to traditional algorithms?
An improved VMD algorithm using EMD and APSO demonstrates superior ECG denoising capabilities compared to traditional methods, better preserving original signal morphology.
Electrocardiogram (ECG) acquisition is easily contaminated by interferences, and denoising is the most important task in ECG detection. The variational mode decomposition (VMD) algorithm is widely used in ECG denoising, which can overcome mode aliasing between intrinsic mode function (IMF) components that existed in the traditional empirical mode decomposition (EMD) algorithm, but the mode decomposition numberKand penalty factor in VMD must be optimized to obtain the best signal decomposition accuracy. This article proposes an improved VMD denoising algorithm that overcomes the shortcomings of slow parameter selection and poor generalization in the traditional VMD algorithm. The algorithm presented first adopts the EMD algorithm to remove the low-frequency baseline drift noise and then employs the adaptive particle swarm optimization (APSO) algorithm to optimize the parameter pair (K, ) for VMD. To validate the denoising performance of the improved VMD algorithm, the No. 103 record from the Massachusetts Institute of Technology (MIT) arrhythmia database is first selected as the pure ECG signal, then both 20-dB Gaussian white noises and 0. 3-Hz baseline drift are added to simulate the noisy ECG signal. Second, the ECG signals of nine subjects are collected by a customized ECG detection platform based on AD8232 and ADALM1000. The ECG denoising results in simulation and actual experiments show that the improved VMD algorithm achieves the highest signal-to-noise ratio (SNR), correlation coefficient (CC), and minimum mean square error (MSE) compared with the traditional EMD and VMD algorithms, which demonstrates that the proposed denoising algorithm has stronger denoising ability and better retains morphological characteristics of the original ECG signals.
Li et al. (Thu,) conducted a other in ECG denoising (n=9). Improved VMD denoising algorithm vs. Traditional EMD and VMD algorithms was evaluated on Signal-to-noise ratio (SNR), correlation coefficient (CC), and minimum mean square error (MSE). An improved VMD denoising algorithm achieved higher signal-to-noise ratio and correlation coefficient, and lower mean square error compared with traditional EMD and VMD algorithms.
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