대한의용생체공학회:학술대회논문집 (Proceedings of the KOSOMBE Conference)
- 대한의용생체공학회 1995년도 추계학술대회
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- Pages.265-268
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- 1995
Bispectrum을 이용한 EP 신호 복원에서의 Wiener process 응용
Estimation of the Evoked Potential using Bispectrum with Confidence Thresholding
- Park, J.I. (Department of Electrical Engineering, Kwangwoon University) ;
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Ahn, C.B.
(Department of Electrical Engineering, Kwangwoon University)
- 발행 : 1995.11.17
초록
Signal averaging technique to improve signal-to-noise ratio has widely been used in various fields, especially in electrophysiology. Estimation of the EP(evoked potential) signal using the conventional averaging method fails to correctly reconstruct the original signal under EEG(electroencephalogram) noise especial]y when the latency times of the evoked potential are not identical. Therefore, a technique based on the bispectrum averaging was proposed for recovering signal waveform from a set o noisy signals with variable signal dalay. In this paper an improved bispectrum estimation technique of the RP signal is proposed using a confidence thresholding of the EP signal in frequency domain in which energy distribution of the EP signal is usually not uniform. The suggested technique is coupled with the conventional bispectrum estimation technique such as least square method and recursive method. Some results with simulated data and real EP signal are shown.
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