EEG IIR Filter - Zero Phase Shift Butterworth Filters
The Infinite Impulse Response (IIR) Filters transform allows you to filter or attenuate undesired
frequency (spectral) components that are present in the EEG data. For example, it is typically
desired to attenuate high-frequency noise in order to create a smoother representation
of the raw EEG signal or an ERP. Likewise, slow-frequency components can be filtered out to
eliminate long-lasting offsets of non-physiological origin in oscillatory EEG signals.
The IIR Filters in Analyzer are phase-shift free Butterworth filters.