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Related Concept Videos

Reducing Line Loss01:18

Reducing Line Loss

328
In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
328
Lossy Lines and Overvoltages01:22

Lossy Lines and Overvoltages

319
Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
319
Maximum Power Flow and Line Loadability01:23

Maximum Power Flow and Line Loadability

559
The maximum power flow for lossy transmission lines is derived using ABCD parameters in phasor form. These parameters create a matrix relationship between the sending-end and receiving-end voltages and currents, allowing the determination of the receiving-end current. This relationship facilitates calculating the complex power delivered to the receiving end, from which real and reactive power components are derived.
559
Lossless Lines01:23

Lossless Lines

514
In electrical engineering, a lossless transmission line is characterized by a purely imaginary propagation constant and a resistive characteristic impedance. The ABCD parameters, which describe the relationship between the input and output voltages and currents, indicate an equivalent π circuit with an imaginary series impedance and a shunt admittance. This results in a transmission line that, when the product of the phase constant (beta) and the length of the line is less than pi, exhibits...
514
Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

383
Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
383
Power Factor Correction01:20

Power Factor Correction

447
The power transmission to a factory involves the transfer of apparent power, a combination of active and reactive power. The power factor measures how effectively electrical power is converted into useful work output. The ratio of the real power (KW) that does the work to the apparent power (KVA) supplied to the circuit.
447

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ZapLine: A simple and effective method to remove power line artifacts.

Alain de Cheveigné1

  • 1Laboratoire des Systèmes Perceptifs, UMR 8248, CNRS, France; Département d'Etudes Cognitives, Ecole Normale Supérieure, PSL, France; UCL Ear Institute, United Kingdom.

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This study introduces a novel method to remove power line artifacts from electrophysiology data. The technique combines spectral and spatial filtering for cleaner electroencephalography (EEG), magnetoencephalography (MEG), and local field potential (LFP) recordings.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Signal Processing

Background:

  • Power line artifacts significantly contaminate electrophysiological recordings.
  • Existing artifact removal methods have limitations and drawbacks.
  • Accurate signal analysis requires effective artifact attenuation.

Purpose of the Study:

  • To present a novel, simple method for removing power line artifacts from multichannel electrophysiological data.
  • To combine the benefits of spectral and spatial filtering while mitigating their respective disadvantages.
  • To provide a universally applicable method for electroencephalography (EEG), magnetoencephalography (MEG), and local field potentials (LFP).

Main Methods:

  • Utilizing a perfect-reconstruction filterbank to separate data into noise-free and artifact-contaminated components.
  • Applying spatial filtering to the artifact-contaminated data to isolate and remove line noise.
  • Recombining the processed artifact-free and artifact-contaminated streams to yield clean data.

Main Results:

  • The proposed method effectively attenuates power line artifacts.
  • The technique preserves the integrity of the underlying electrophysiological signals.
  • Evaluation with synthetic and real data demonstrates the method's efficacy.

Conclusions:

  • The combined spectral and spatial filtering approach offers a robust solution for power line artifact removal.
  • This method enhances the quality of multichannel electrophysiological data for research and clinical applications.
  • The simplicity and effectiveness make it a valuable tool for neuroscientists and biomedical engineers.