fall 2013 ece senior design: portable lock-in amplifier for brain-machine interfacing
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Fall 2013 ECE Senior Design:Portable Lock-in Amplifier for Brain-Machine Interfacing
Jamie NortonProfessor Scott Carney
Electroencephalography (EEG)
Steady-state potentials
Brain Machine Interfaces
Noise problem
Software approach
• Essentially seeks to take readings from a standard EEG amplifier, filter and combine them in some way to maximize accurate detection of steady-state potentials.
• Variety of Methods– PSDA– MEC– CCA– Modified CCA
Hardware Approach: Lock-in AmplifierIf we have some sinusoidal signal, and a reference signal.
And we multiply them…
Goals
• Develop a simple and portable lock-in amplifier for the detection of SSVEP signals.
• Explore their use under ideal and non-ideal conditions.
• Combine with EEG recordings to detect SSVEP entrainments by end of semester.
References• Lock-in Amplifier Design
http://www.youtube.com/watch?v=luiDMVAsyTc
• http://www.phys.utk.edu/labs/modphys/lock-in%20amplifier%20experiment.pdf
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