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:
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- IEEE Keywords
- Index Terms
- Changes In Frequency ,
- Electroencephalogram Signals ,
- Control System ,
- Frequency Range ,
- Variant Frequency ,
- Frequency Components ,
- Biomedical Engineering ,
- Phase-locked Loop ,
- Loop Circuit ,
- Electrode ,
- Synchronization ,
- Low-pass ,
- Input Signal ,
- Electromyography ,
- Spectral Power ,
- High-pass Filter ,
- Resultant Increase ,
- EEG Signals ,
- Log Ratio ,
- Signal Segments ,
- High Frequency Components ,
- Single Amplitude
- Author Keywords
Keywords assist with retrieval of results and provide a means to discovering other relevant content. Learn more.
- IEEE Keywords
- Index Terms
- Changes In Frequency ,
- Electroencephalogram Signals ,
- Control System ,
- Frequency Range ,
- Variant Frequency ,
- Frequency Components ,
- Biomedical Engineering ,
- Phase-locked Loop ,
- Loop Circuit ,
- Electrode ,
- Synchronization ,
- Low-pass ,
- Input Signal ,
- Electromyography ,
- Spectral Power ,
- High-pass Filter ,
- Resultant Increase ,
- EEG Signals ,
- Log Ratio ,
- Signal Segments ,
- High Frequency Components ,
- Single Amplitude
- Author Keywords