Stefan Bernhard is Professor for medical technology and extracorporeal systems at Technical University Mittelhessen. His research is focused on cardiovascular modelling and biosignal processing. Andreas Brensing is Professor for medical technology at RheinMain University of Applied Sciences. His research is focused on medical application of microwave technology and biosignal processing. Karl-Heinz Witte is Professor of transmission technology and was lecturer in biosignal processing at RheinMain University of Applied Sciences. His research is focused on biosignal processing and modeling.