All fifiles are subject to a 1 Hz high-pass fifilter. The fifilter removes non-stationary signal drift across the recording and serves as a pre-processing step for the electrical noise removal and ICA steps that follow (Bigdely-Shamlo et al., 2015; Winkler et al., 2015). ICA has been shown to perform best at separating signals following a 1–2 Hz high-pass fifilter on the data (Winkler et al., 2015). For fifiles collected with sampling rates equal to or greater than 500 Hz, the 1Hz fifilter is incorporated into a band-pass fifilter from 1 to 249 Hz to constrain the signal decomposed by ICA.
所有文件都经过1 Hz高通滤波器。 滤波器可以消除整个记录中的非平稳信号漂移，并用作电噪声去除和随后的ICA步骤的预处理步骤（Bigdely-Shamlo等，2015； Winkler等，2015）。 ICA已被证明在对数据进行1-2 Hz高通滤波器之后，在分离信号方面表现最佳（Winkler等人，2015）。 对于以等于或大于500 Hz的采样率收集的文件，将1Hz滤波器合并到1到249 Hz的带通滤波器中，以约束ICA分解的信号。
原文：https://www.cnblogs.com/rgd2019/p/11988394.html