ABSTRACT
Computer algorithms have been developed for automatic pre-processing. It is divided into two categories: filtering and decomposition either by independent component analysis or principal component analysis. The most widely used filter on the electroencephalography is the band-pass filter. The band-pass filter is a combination of a low-pass filter and a high-pass filter. In contrast, Infinite impulse response (IIR) filters are designed first for the analog case and then discretized to get the digital IIR filters. The oldest and the most widely used analog IIR filters are the Chebyshev filter and the Butterworth filter. A Gaussian filter is one whose impulse response is a Gaussian function. When a Gaussian filter is used, more weights are assigned to the particular point where Gaussian filtering is being applied and higher weights closer to the same point, whereas less and less weights are assigned to the points away from the point of application of the filter.
