1. 电子科技大学自动化系,成都,610054
2. 中国科技大学认知科学开放实验室,北京,100039
3. 电子科技大学自动化系成都,610054
4. 中国科技大学认知科学开放实验室北京,100039
纸质出版:2001
移动端阅览
尧德中, 周映春, 范思陆, 等. 多维延时相关MUSIC方法:一种求解脑电逆问题的新方法[J]. 电子学报, 2001,29(4):522-525.
YAO De-zhong, ZHOU Ying-chun, FAN Si-lu, et al. Multi-Dimensional Delay-Correlation MUSIC: A New Method to Extract Multi-Sources of EEGs[J]. Acta Electronica Sinica, 2001, 29(4): 522-525.
将经典的多信号分类算法(MUSIC)用于研究脑电逆问题时存在两个问题:对有色噪音敏感和不能识别相干源.近年人们提出了利用延时相关、高阶累积量或假设已知噪音协方差来缓解有色噪音对算法的影响.对于相干源
则有人提出了递归的多维MUSIC方法.本文在这些工作的基础上建立了一种基于延时相关阵的、叠代的多维MUSIC算法.仿真数据及实际脑电应用研究表明
该方法能在压制有色噪音的同时识别多个相干源
因而具有明显的意义.
The reported studies on EEG inverse by multiple signal classification (MUSIC) show the classical MUSIC algorithm suffers from two shortcomings:be sensitive to a color noise and fail in identifying synchronously active sources.Recent studies reveal that the MUSIC-based algorithm may be improved in depressing spatial coherent noise if the classical zero delay correlation matrix is replaced by a non-zero delay-correlation matrix
or by a high-order cumulant matrix
or by incorporating known noise covariance matrix in the zero-delay correlation matrix.And the MUSIC algorithm can be extended to identify synchronous actives through a recursive strategy.In this work
an iterative
multi-dimensional and delay-correlation MUSIC is proposed
where the color noise is depressed by the non-zero delay correlation and the synchronous active sources are identified by the iterative multi-dimensional MUSIC search.Simulation and VEP data tests show a good reconstruction is obtained.
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