Hum Filter: Power‐Line Noise Eliminator for Shallow Seismic Data

1998 ◽  
Author(s):  
Jianghai Xia ◽  
Richard D. Miller
Keyword(s):  
Seismic Data ◽  
Power Line ◽  
Shallow Seismic ◽  
Power Line Noise ◽  
Line Noise

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

Sensors ◽  
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.

scholarly journals Separation of power-line noise from tinnitus sound, to aid medical diagnoses

2016 ◽  
Vol 8 ◽  
pp. 7-9
Author(s):  
J. Dhoulath Beegum ◽  
D. Chithraprasad ◽  
Alan Jacob ◽  
D.S. Ananthakrishnan ◽  
Gayatri Nair ◽  
...  
Keyword(s):  
Power Line ◽  
Medical Diagnoses ◽  
Power Line Noise ◽  
Line Noise

scholarly journals Modelling and comparison for low-voltage broadband power line noise using LS-SVM and wavelet neural networks

2019 ◽  
Vol 13 (2) ◽  
pp. 171-178
Author(s):  
Xiongwen Zhao ◽  
Hui Zhang ◽  
Liang Li ◽  
Wenbing Lu ◽  
Yi Ding ◽  
...  
Keyword(s):  
Neural Networks ◽  
Low Voltage ◽  
Power Line ◽  
Wavelet Neural Networks ◽  
Power Line Noise ◽  
Line Noise

Analysis of the Indoor Broadband Power-Line Noise Scenario

2010 ◽  
Vol 52 (4) ◽  
pp. 849-858 ◽  
Author(s):  
Jose Antonio Cortes ◽  
Luis Diez ◽  
Francisco Javier Canete ◽  
Juan Jose Sanchez-Martinez
Keyword(s):  
Power Line ◽  
Power Line Noise ◽  
Line Noise
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