Biosignal Acquisition System Design and ECG Signal Preprocessing

• Main Authors: Wei-Chu Lin, 林威助
• Other Authors: Pei-Chen Lo
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/55503001115639701339

碩士 === 國立交通大學 === 電機與控制工程系 === 89 === This thesis includes two parts. In Part I, due to the hardware limitation in our laboratory, the research work has been focused on the EEG (electroencephalograph) signal analysis. In order to explore more physiological phenomena during meditation and understand the correlation among different signals, we need to design and implement a data acquisition system capable of recording a number of physiological signals. This system includes three biological-signal amplifiers and one A-to-D interface card. The three amplifiers are used to measure the ECG (electrocardiograph), skin conductance, and blood oxygen saturation, respectively. This system and the NeuroScan EEG recording system can be triggered simultaneously by a switch to synchronize both systems. All of the hardware control is set up on the bench of Labview software for convenience of programming development and maintenance. In addition, the development of man-machine interface is straightforward using the Labview software. Part II of the thesis is devoted to the preprocessing of ECG signal. First, we aim to design an algorithm for R wave detection. Next, the ECG signal is segmented, based on the R-wave detection, to form a 2D matrix. The results can be further analyzed, in both time and frequency domains, by applying sophisticated DSP (digital signal processing) methods. This study will promote the understanding of more physiological states in meditation.