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1.
In order to characterize the non-Gaussian information contained within the EEG signals, a new feature extraction method based on bispectrum is proposed and applied to the classification of right and left motor imagery for developing EEG-based brain-computer interface systems. The experimental results on the Graz BCI data set have shown that based on the proposed features, a LDA classifier, SVM classifier and NN classifier outperform the winner of the BCI 2003 competition on the same data set in terms of either the mutual information, the competition criterion, or misclassification rate. 相似文献
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本文给出了考虑噪声和动态误差时的高速模数转换器(ADC)的动态传输模型。提出了利用双谱分析高速ADC动态偏置误差的方法。同时,指出双谱方法可以明显地减小ADC噪声本底对微小偏置误差测量的影响,提高测量的灵敏度和精度。最后给出的计算机模拟测试结果表明,双谱法比功率法具有更高的检测分辨率和抗噪声能力。 相似文献
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Abstract. Time series analysts have begun to consider the applicability of nonlinear models. In order for nonlinear models to be accepted by practitioners, practicai tests must be avilable to test for the presence of nonlinearity in both raw time series and in the residuals from fitted models. A diagnostic test, based on the bispectrum, for the presence of nonlinear serial dependence in these time series is investigated here using artificial data. Detection of such nonlinear dependence is taken to indicate that nonlinear modelling methods are necessary. The theory behind the test is reviewed and simulations driven by pseudorandom numbers are presented for a variety of models and sample sizes. The simulations indicate that the test has substantial power for many models. In addition, theoretical and empirical results are presented which show that the bispectral diagnostic test is equally powerful for both the source series and for the fitting errors from a line& model. Thus, while the test is suitable for use as a diagnostic test on the fitting errors of linear time series models, prior linear modeling of the time series is not required. 相似文献
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水声信号的非高斯特性分析与检测方法的研究 总被引:6,自引:0,他引:6
本文研究了海洋环境噪声和船舶噪声的高斯性,通过实验研究发现,纯净的海洋环境噪声(夜晚无行船时)呈现出高斯性,反之是非高斯;船舶噪声是服从非高斯的,另外无论海洋环境噪声,还是船舶噪声,在相等样本长度下,在不同频段的高斯性上也有差异,分析频段越低,统计量越大,反之统计量越小.基于高阶累积量T2在船舶由远及近的过程中的变化规律,研究了非高斯背景下非高斯信号的一种检测方法,即在海洋环境噪声下检测船舶噪声的方法.通过实船实验得到了满意的结果. 相似文献
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S. V. Narasimhan Nandini Basumallick Ratana Chaitanya 《Signal, Image and Video Processing》2008,2(3):261-274
In this paper, a new method for extracting the system phase from the bispectrum of the system output has been proposed. This
is based on the complete bispectral data computed in the frequency domain and modified group delay. The frequency domain bispectrum computation improves the frequency resolution and the modified
group delay reduces the variance preserving the frequency resolution. The use of full bispectral data also reduces the variance
as it is used for averaging. For the proposed method at a signal to noise ratio of 5dB, the reduction in root mean square
error is in the range of 1.5–7 times over the other methods considered. 相似文献
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Abstract. A relation is presented which is a necessary and sufficient condition for the bispectrum to be of the linear process type. 相似文献
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