巴特沃斯滤波器是电子滤波器的一种。巴特沃斯滤波器的特点是通频带内的频率响应曲线最大限度平坦，没有起伏，而在阻频带则逐渐下降为零。 在振幅 的对数对角频率的波特图 上,从某一边界角频率开始,振幅随着角频率的增加而逐步减少,趋向负无穷大。该段代码就是巴特沃斯高通和低通滤波器的设计。-Bart wo filter is a kind of electronic filters. Bart wo filter is characteristic of the passband frequency response curve within the maximum flat, no ups and downs, and in the resistance is gradually reduced to zero frequency band. In the logarithm of amplitude of the potter JiaoPinLv chart, from a boundary JiaoPinLv began, with the increase of the amplitude JiaoPinLv gradually reduce tend to be negative infinity. When the code is bart wo high and low pass filter design.