Abstract: Physiological signals such as electroencephalogram (EEG) signals are often corrupted by artifacts during the acquisition and processing. Some of these artifacts may deteriorate the essential properties of the signal that pertains to meaningful information. Most of these artifacts occur due to the involuntary movements or actions the human does during the acquisition process. So, it is recommended to eliminate these artifacts with signal processing approaches. This paper presents two mechanisms of classification and elimination of artifacts. In the first step, a customized deep network is employed to classify clean EEG signals and artifact-included signals. The classification is performed at the feature level, where common space pattern features are extracted with convolutional layers, and these features are later classified with a support vector machine classifier. In the second stage of the work, the artifact signals are decomposed with empirical mode decomposition, and they are then eliminated with the proposed adaptive thresholding mechanism where the threshold value changes for every intrinsic mode decomposition in the iterative mechanism.

Key words: artifact elimination, deep network, electroencephalogram (EEG) signal classification, empirical mode decomposition

摘要： 脑电信号等生理信号在采集和处理过程中经常受到伪影干扰。其中一些伪影可能会恶化与有意义信息相关的信号的基本属性。这些伪影大多是由于人们在获取过程中不自觉的运动或动作而产生的。因此，建议使用信号处理的方法消除这些伪影。本文提出了两种伪影的分类和消除机制。第一阶段使用定制的深度网络对干净的脑电信号和伪影信号进行分类。分类是在特征层上进行的，使用卷积层提取公共空间模式特征，然后使用支持向量机分类器对这些特征进行分类。在第二阶段，对伪影信号进行经验模态分解，并提出自适应阈值消除机制。在该迭代机制中，每个固有模态分解的阈值都会发生改变。

关键词: 伪影消除，深度网络，脑电信号分类，经验模态分解