小波时频滤波器用于事件关联电位单次提取的研究  

Studies on the Single Trial Extracting of Event Related Potentials Using the Time Frequency Filter of Wavelet

作　　者：李鲁平[1] 罗建[1] 程敬之[1] 

机构地区：[1]西安交通大学

出　　处：《西安交通大学学报》1998年第3期21-23,共3页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金

摘　　要：从单次脑诱发响应记录中提取有效信息，可以从根本上避免叠加平均法的弊端．在对听觉事件关联电位时－频域特性分析的基础上，结合相关分析方法，设计出了基于多分辨分析的样条小波时频滤波器，用以完成ＥＲＰ单次提取．大量提取实验表明，小波时频滤波器可以有效地从强背景噪声中提取单次ＥＲＰ．Estimating the useful brain signal from a single recorded data is aimed at to correct the possible error introduced with the averaging techniques. Combining the correlation analysis, a new approach to extract single trial event related potential (ERP) is proposed. This approach, called time frequency filter, is based on the concept of multiresolution wavelet transform. An investigation into properties in time and frequency domain was carried out on the single ERP and average ERP. The results from a large amount of test show that wavelet time frequency filter can effectively extract the single ERP from strong background noise.

关 键 词：小波变换 时频滤波器 事件关联电位 脑电图 

分 类 号：R741.044[医药卫生—神经病学与精神病学] TN941.1[医药卫生—临床医学]