TY - JFULL AU - Sun K. Yoo and Hee Cheol Kang PY - 2013/11/ TI - Amplitude and Phase Analysis of EEG Signal by Complex Demodulation T2 - International Journal of Biomedical and Biological Engineering SP - 647 EP - 651 VL - 7 SN - 1307-6892 UR - https://publications.waset.org/pdf/17143 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 82, 2013 N2 - Analysis of amplitude and phase characteristics for delta, theta, and alpha bands at localized time instant from EEG signals is important for the characterizing information processing in the brain. In this paper, complex demodulation method was used to analyze EEG (Electroencephalographic) signal, particularly for auditory evoked potential response signal, with sufficient time resolution and designated frequency bandwidth resolution required. The complex demodulation decomposes raw EEG signal into 3 designated delta, theta, and alpha bands with complex EEG signal representation at sampled time instant, which can enable the extraction of amplitude envelope and phase information. Throughout simulated test data, and real EEG signal acquired during auditory attention task, it can extract the phase offset, phase and frequency changing instant and decomposed amplitude envelope for delta, theta, and alpha bands. The complex demodulation technique can be efficiently used in brain signal analysis in case of phase, and amplitude information required. ER -