中文说明：
绘制四种常用低通模拟滤波器（贝赛尔滤波器，巴特沃斯滤波器，切比雪夫滤波器及椭圆滤波器）幅频特性曲线。
English Description：
The amplitude frequency characteristic curves of four common low-pass analog filters (Bessel filter, Butterworth filter, Chebyshev filter and elliptic filter) are drawn.
Draw four kinds of commonly used low-pass analog filter, amplitude frequency characteristic curve
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中文说明：
绘制四种常用低通模拟滤波器（贝赛尔滤波器，巴特沃斯滤波器，切比雪夫滤波器及椭圆滤波器）幅频特性曲线。
English Description：
The amplitude frequency characteristic curves of four common low-pass analog filters (Bessel filter, Butterworth filter, Chebyshev filter and elliptic filter) are drawn.
four_filter.m