Abstract:
We present a novel methodology based on communication systems, able to track frequency changes in biosignals. The proposed approach is based on a phase lock loop (PLL) ci...Show MoreMetadata
Abstract:
We present a novel methodology based on communication systems, able to track frequency changes in biosignals. The proposed approach is based on a phase lock loop (PLL) circuit and includes subcomponents that allow the estimation of frequency variations. The proposed system can be modeled as a second-order control system, enabling a strait forward definition of its parameters. We found that depending on the initial frequency of the voltage-controlled oscillator (VCO) the PLL tracks different frequency components, allowing assessing the range of frequencies that changes and how they change, leading to the development of time-frequency maps. The new approach was tested in Electroencephalogram (EEG) signals collected from patients subjected to general anesthesia. The developed methodology is available online as a demonstration tool for students from the Master on Biomedical Engineering at University of Coimbra. The system is didactic in two ways: it demonstrates how a second order control systems works, and how frequency variations in the time-frequency domain are computed and their importance.
Published in: 2015 3rd Experiment International Conference (exp.at'15)
Date of Conference: 02-04 June 2015
Date Added to IEEE Xplore: 05 May 2016
ISBN Information: