【摘要】 介绍了平滑伪Wigner-Ville分布(SPWD)的基本原理,并说明了Cohen类时频分布和SPWD之间的关系,给出了SPWD的离散形式。对一段诱发同步脑电信号做了时频分析,并将结果和基于Fourier变换的谱估计和基于短时Fourier变换的谱图进行了比较,从时频分布图中观察到了用谱图方法难以看到的枕部α波“squeak”现象。更多还原

【Abstract】 The theory of Smoothed Pseudo Wigner-Ville distribution(SPWD) and the relationship between Cohen’s class and SPWD are introduced, and then the discrete form of SPWD is presented. A time event related synchronization EEG signal is analyzed using SPWD. The results are compared with those obtained by using spectrum estimation based on Fourier transform and by using spectrogram based on short time Fourier transform. From the results of time-frequency distribution, the “squeak” phenomenon of occipital alpha rhythm which is hardly found in spectrogram is observed.更多还原