Key result
The proposed real-time FFT-based notch filter effectively removed power line interference from ECG signals, achieving a signal-to-noise ratio of 70.9 dB outside the rejection band and -51.6 dB inside.
Why the study?
Despite improvements in digital filtering common-mode rejection ratios, ECG traces recorded by commercialized devices remain contaminated by residual power line interference.
Does a real-time FFT-based notch filter improve power line interference cancellation and signal preservation in ECG signals compared to Butterworth and wavelet filters?
Does a real-time FFT-based notch filter improve power line interference cancellation and signal preservation in ECG signals compared to Butterworth and wavelet filters?
Absolute Event Rate: 70.9% vs 69.4%
A novel real-time FFT-based notch filter effectively removes power line interference from ECG signals while preserving the underlying cardiac waveforms better than traditional filters.
May enhance real-time ECG denoising in devices; leaves open clinical adoption pending validation.
Despite the considerable improvement of the common-mode rejection ratio of digital filtering techniques, the electrocardiogram (ECG) traces recorded by commercialized devices are still contaminated by residual power line interference (PLI). In this study, we address this issue by proposing a novel real-time filter adapted to single-frequency noise cancellation and automatic power line frequency detection. The filtering process is principally based on a point-by-point fast Fourier transform and a judicious choice of the analysis window length. Intensive experiments conducted on real and synthetic signals have shown that our filtering method offers very clean ECGs, due to the suppression of spikes corresponding to the PLI and the preservation of spikes outside the filter band. In addition, this method is characterized by its low computational complexity which makes it suitable for real-time cleaning of ECG signals and thus can serve for more accurate diagnosis in computer-based automated cardiac system.
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Slimane et al. (2021) studied Electrocardiogram signal contamination (Power line interference) (n=100). Real-time fast Fourier transform-based notch filter vs. Butterworth and wavelet notch filters was evaluated on Signal-to-noise ratio (SNR) outside and inside the rejection band. The proposed real-time FFT-based notch filter effectively removed power line interference from ECG signals, achieving a signal-to-noise ratio of 70.9 dB outside the rejection band and -51.6 dB inside.
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