Smith J R, Johnson A S
Electroencephalogr Clin Neurophysiol. 1986 Oct;64(4):375-7. doi: 10.1016/0013-4694(86)90162-8.
Magnetic recording and/or analog-to-digital conversion add noise to the data. This paper describes a method for reducing the noise added to EEG data by recording and digitizing. A linear filter is described which pre-emphasizes the EEG before recording or digitizing; a second filter then recovers the original signal after playback. The technique can result in a factor of 10 (20 dB) improvement of the signal-to-noise ratio of high frequency EEG components.
磁记录和/或模数转换会给数据添加噪声。本文描述了一种减少因记录和数字化而添加到脑电图（EEG）数据中的噪声的方法。文中介绍了一种线性滤波器，它在记录或数字化之前对脑电图进行预加重；然后第二个滤波器在回放后恢复原始信号。该技术可使高频脑电图成分的信噪比提高10倍（20分贝）。
