Power Line Noise Reduction for Bio-Sensing Applications Using N-Path Notch Filter

Background: It is essential to reduce these disturbances in ECG signal to improve accuracy and reliability. 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 deals with the digital filtering method to reduce 50 Hz power line noise artifacts in the ECG signal. 4th order Butterworth notch filters(BW=.5 Hz) is used to reduce 50 Hz power line noise interference(PLI) from ECG signals and its performance is compared with Adaptve filters. Method: ECG signal is taken from physionet database. ECG signal (with PLI noise of different frequencies) were processed by Butterworth notch filters of bandwidths of 0.5 Hz. Ringing Artifact is observed in the output. ECG signal (with PLI noise of different frequencies) were processed by Adaptive filters no ringing effect seen. Wavelet filtering applied clean ECG were observed. Result: Performance is compared based on SNR and MSE of Butterworth notch filter and adaptive filters and output of wallet filtering were observed. Conclusion: RLS adaptive filter give better performance as compared to IIR Butterworth and LMS. Clean ECG were seen when filtering using symlet8 wavelet was done.

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Theoretical study of stubs for power line noise reduction [LSI applications]

Proceedings of the IEEE 2003 Custom Integrated Circuits Conference, 2003. ◽

10.1109/cicc.2003.1249493 ◽

2004 ◽

Cited By ~ 1

Author(s):

T. Nakura ◽

M. Ikeda ◽

K. Asada

Keyword(s):

Noise Reduction ◽

Theoretical Study ◽

Power Line ◽

Power Line Noise ◽

Line Noise

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N-path notch filter with a 43-dB notch depth improvement for power line noise suppression

2016 International Symposium on Electronics and Smart Devices (ISESD) ◽

10.1109/isesd.2016.7886716 ◽

2016 ◽

Cited By ~ 8

Author(s):

Nicodimus Retdian ◽

Takeshi Shima

Keyword(s):

Noise Suppression ◽

Notch Filter ◽

Power Line ◽

Notch Depth ◽

Power Line Noise ◽

Line Noise

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Separation of EOG Artifact and Power Line Noise-50Hz from EEG by Efficient Stone's BSS Algorithm

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.543-547.2687 ◽

2014 ◽

Vol 543-547 ◽

pp. 2687-2691 ◽

Cited By ~ 1

Author(s):

Ahmed Kareem Abdullah ◽

Chao Zhu Zhang ◽

Si Yao Lian

Keyword(s):

Notch Filter ◽

Optimization Procedure ◽

Power Line ◽

Eeg Signals ◽

Separation Algorithm ◽

Eeg Data ◽

Temporal Predictability ◽

Power Line Noise ◽

Computerized Eeg ◽

Line Noise

An enhanced blind source separation algorithm based on Stone's BSS approach is proposed, to reject the Electrooculogram (EOG) artifact and power line noise (50Hz) from simulated and real human Electroencephalography (EEG) signals without the notch filter, in order not to lose any useful EEG data around the 50-Hz. The proposed algorithm which called efficient Stones BSS (ESBSS) has been compared with four well-known BSS algorithms over super-Gaussian, sub-Gaussian artifacts and EEG signals with a linear mixture. In Original Stones BSS, the half-life values taken as a constant, typically (hlong≥100 hShort), but in the proposed work, an optimization procedure is used to change these values until the maximum temporal predictability is found. The real EEG data are taken from Imperial College London using a computerized EEG device with eight electrodes placed according to the 10-20 system.

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Common-Mode Voltage Reduction in Capacitive Sensing of Biosignal Using Capacitive Grounding and DRL Electrode

Sensors ◽

10.3390/s21072568 ◽

2021 ◽

Vol 21 (7) ◽

pp. 2568

Author(s):

Tadeas Bednar ◽

Branko Babusiak ◽

Michal Labuda ◽

Milan Smetana ◽

Stefan Borik

Keyword(s):

Noise Removal ◽

Power Line ◽

Measured Signal ◽

Common Mode ◽

Line Frequency ◽

Electrode Area ◽

Common Mode Voltage ◽

Grounding Electrode ◽

Power Line Noise ◽

Line Noise

A capacitive measurement of the biosignals is a very comfortable and unobtrusive way suitable for long-term and wearable monitoring of health conditions. This type of sensing is very susceptible to noise from the surroundings. One of the main noise sources is power-line noise, which acts as a common-mode voltage at the input terminals of the acquisition unit. The origin and methods of noise reduction are described on electric models. Two methods of noise removal are modeled and experimentally verified in the paper. The first method uses a passive capacitive grounding electrode, and the second uses an active capacitive Driven Right Leg (DRL) electrode. The effect of grounding electrode size on noise suppression is experimentally investigated. The increasing electrode area reduces power-line noise: the power of power-line frequency within the measured signal is 70.96 dB, 59.13 dB, and 43.44 dB for a grounding electrode area of 1650 cm2, 3300 cm2, and 4950 cm2, respectively. The capacitive DRL electrode shows better efficiency in common-mode noise rejection than the grounding electrode. When using an electrode area of 1650 cm2, the DRL achieved 46.3 dB better attenuation than the grounding electrode at power-line frequency. In contrast to the grounding electrode, the DRL electrode reduces a capacitive measurement system’s financial costs due to the smaller electrode area made of the costly conductive textile.

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