Off-the-shelf, consumer-grade EEG equipment is nowadays becoming the first-choice equipment for many scientists when it comes to recording brain waves for research purposes. On one hand, this is perfectly understandable due to its availability and relatively low cost (especially in comparison to some clinical-level EEG devices), but, on the other hand, quality of the recorded signals is gradually increasing and reaching levels that were offered just a few years ago by much more expensive devices used in medicine for diagnostic purposes. In many cases, a well-designed filter and/or a well-thought signal acquisition method improve the signal quality to the level that it becomes good enough to become subject of further analysis allowing to formulate some valid scientific theories and draw far-fetched conclusions related to human brain operation. In this paper, we propose a smoothing filter based upon the Savitzky–Golay filter for the purpose of EEG signal filtering. Additionally, we provide a summary and comparison of the applied filter to some other approaches to EEG data filtering. All the analyzed signals were acquired from subjects performing visually involving high-concentration tasks with audio stimuli using Emotiv EPOC Flex equipment.

中文翻译：

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音频刺激期间平滑滤波器对使用 Emotiv EPOC Flex 脑机接口耳机记录的数据质量的影响比较

现成的消费级脑电图设备如今已成为许多科学家在记录脑电波用于研究目的时的首选设备。一方面，这是完全可以理解的，因为它的可用性和相对较低的成本（特别是与一些临床级脑电图设备相比），但另一方面，记录信号的质量正在逐渐提高并达到所提供的水平就在几年前，更昂贵的设备被用于医学诊断目的。在许多情况下，精心设计的滤波器和/或深思熟虑的信号采集方法可以将信号质量提高到足以成为进一步分析主题的水平，从而可以制定一些有效的科学理论并得出牵强的结论与人的大脑运作有关。在本文中，我们提出了一种基于 Savitzky-Golay 滤波器的平滑滤波器，用于脑电图信号滤波。此外，我们还提供了所应用的过滤器与其他一些脑电图数据过滤方法的总结和比较。所有分析的信号均来自使用 Emotiv EPOC Flex 设备执行涉及音频刺激的视觉高度集中任务的受试者。