Shirakawa S, Smith J R, Azumi K
Int J Biomed Comput. 1987 Jan;20(1-2):87-95. doi: 10.1016/0020-7101(87)90017-1.
The response of two types of linear filters to sinusoidal bursts was calculated to demonstrate how filters can distort EEG waveforms. Results show that the wider the filter bandwidth the less is the distortion, and for a given bandwidth, the higher the filter order the greater the distortion. The response of a linear phase filter was also calculated to demonstrate that this type of filter can also cause waveform distortion, although it is normally less than that caused by Butterworth, Tchebychev and elliptic filters.
计算了两种线性滤波器对正弦脉冲串的响应，以说明滤波器如何使脑电图波形失真。结果表明，滤波器带宽越宽，失真越小；对于给定的带宽，滤波器阶数越高，失真越大。还计算了线性相位滤波器的响应，以证明这种类型的滤波器也会导致波形失真，尽管通常小于巴特沃斯、切比雪夫和椭圆滤波器所造成的失真。
