Adaptive Filter
Adaptive Filter is a system with a linear filter that has a transfer function controlled by variable parameters and a means to adjust those parameters according to an optimization algorithm.The filter weights can adapt based on the feedback from output of the system and it requires a reference input o compare the desired output with the observed output.
The use of adaptive filter for EOG artifact removal
where s[n] is observed signal,x[n] is original EEG,r[n] is artifact,x’[n] is artifact-free EEG.