Single channel surface electromyogram deconvolution is a useful pre-processing for myoelectric control

2021 ◽  
pp. 1-1
Author(s):  
Maxime Bourges ◽  
Ganesh R. Naik ◽  
Luca Mesin
Keyword(s):  
Single Channel ◽  
Myoelectric Control ◽  
Surface Electromyogram ◽  
Channel Surface

scholarly journals Motor Unit Discharges from Multi-Kernel Deconvolution of Single Channel Surface Electromyogram

Electronics ◽  
2021 ◽  
Vol 10 (16) ◽  
pp. 2022
Author(s):  
Luca Mesin
Keyword(s):  
Single Channel ◽  
Motor Units ◽  
Single Channels ◽  
Surface Electromyogram ◽  
Non Invasive ◽  
Parallel Fibres ◽  
Channel Surface ◽  
Large Phase ◽  
Cross Correlations

Surface electromyogram (EMG) finds many applications in the non-invasive characterization of muscles. Extracting information on the control of motor units (MU) is difficult when using single channels, e.g., due to the low selectivity and large phase cancellations of MU action potentials (MUAPs). In this paper, we propose a new method to face this problem in the case of a single differential channel. The signal is approximated as a sum of convolutions of different kernels (adapted to the signal) and firing patterns, whose sum is the estimation of the cumulative MU firings. Three simulators were used for testing: muscles of parallel fibres with either two innervation zones (IZs, thus, with MUAPs of different phases) or one IZ and a model with fibres inclined with respect to the skin. Simulations were prepared for different fat thicknesses, distributions of conduction velocity, maximal firing rates, synchronizations of MU discharges, and variability of the inter-spike interval. The performances were measured in terms of cross-correlations of the estimated and simulated cumulative MU firings in the range of 0–50 Hz and compared with those of a state-of-the-art single-kernel algorithm. The median cross-correlations for multi-kernel/single-kernel approaches were 92.2%/82.4%, 98.1%/97.6%, and 95.0%/91.0% for the models with two IZs, one IZ (parallel fibres), and inclined fibres, respectively (all statistically significant differences, which were larger when the MUAP shapes were of greater difference).

Individual Finger Control of Prosthetic Hand from Weak and Single-Channel Surface EMG

2020 ◽  
Author(s):  
John Jairo Villarejo Mayor ◽  
Anselmo Frizera Neto ◽  
André Luiz Félix Rodacki ◽  
Teodiano Freire Bastos-Filho
Keyword(s):  
Single Channel ◽  
Surface Emg ◽  
Prosthetic Hand ◽  
Individual Finger ◽  
Channel Surface ◽  
Finger Control

Differentiation of Epileptic and Psychogenic Nonepileptic Seizures Using Single-Channel Surface Electromyography

2020 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Aatif M. Husain ◽  
Alan R. Towne ◽  
David K. Chen ◽  
Luke E. Whitmire ◽  
Shannon R. Voyles ◽  
...  
Keyword(s):  
Surface Electromyography ◽  
Single Channel ◽  
Psychogenic Nonepileptic Seizures ◽  
Channel Surface ◽  
Nonepileptic Seizures

Experimental Investigation of Single-Phase Flow Pressure Drop Through Rectangular Microchannels

2003 ◽  
Author(s):  
Xiao Tu ◽  
Pega Hrnjak
Keyword(s):  
Surface Roughness ◽  
Single Phase ◽  
Single Channel ◽  
Reynolds Numbers ◽  
Flow Friction ◽  
Aspect Ratios ◽  
Friction Factors ◽  
Rectangular Channels ◽  
Channel Surface ◽  
Flow Pressure

The current work focused on determining the friction factors in five rectangular channels with hydraulic diameters varying from 69.5 to 304.7 μm and with aspect ratios changing from 0.09 to 0.24. The single-channel test sections were carefully designed such that the friction factors could be determined accurately from the experimental data. R134a liquid and vapor were used as the testing fluids. During the experiments, the Reynolds numbers were varied between 112 and 9180. The measured friction factors were compared with the conventional correlations. The results support such a general agreement in the literature that the flow friction in microchannels may be different from the conventional results. However, a more important finding is that when the channel surface roughness was low, even for the smallest channel tested, both the laminar friction factor and the critical Reynolds number approach the conventional values. In the turbulent region, the surface roughness has great effect on the flow friction even for the smoothest channel tested (Ra/Dh = 0.14%).

Sign in / Sign up

Export Citation Format

Share Document